From tim.haley@oracle.com Fri Jul 30 13:10:31 2010 Received: from newsunmail1brm.central.sun.com (newsunmail1brm.Central.Sun.COM [129.147.62.245]) by sac.sfbay.sun.com (8.13.8+Sun/8.13.8) with ESMTP id o6UKAUEY008556 for ; Fri, 30 Jul 2010 13:10:31 -0700 (PDT) Received: from nwk-avmta-1.SFBay.Sun.COM (nwk-avmta-1.SFBay.Sun.COM [129.146.11.74]) by newsunmail1brm.central.sun.com (8.13.7+Sun/8.13.7/ENSMAIL,v2.4) with ESMTP id o6UKAT5V012697; Fri, 30 Jul 2010 14:10:30 -0600 (MDT) Received: from pmxchannel-daemon.nwk-avmta-1.sfbay.Sun.COM by nwk-avmta-1.sfbay.Sun.COM (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) id <0L6E0090701IEJ00@nwk-avmta-1.sfbay.Sun.COM>; Fri, 30 Jul 2010 13:10:30 -0700 (PDT) Received: from sca-ea-mail-2.sun.com ([192.18.43.25]) by nwk-avmta-1.sfbay.Sun.COM (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) with ESMTP id <0L6E0073X01I5C30@nwk-avmta-1.sfbay.Sun.COM>; Fri, 30 Jul 2010 13:10:30 -0700 (PDT) Received: from acsinet15.oracle.com (acsinet15.oracle.com [141.146.126.227]) by sca-ea-mail-2.sun.com (8.13.7+Sun/8.12.9) with ESMTP id o6UKAOI3007611; Fri, 30 Jul 2010 20:10:24 +0000 (GMT) Received: from acsmt355.oracle.com (acsmt355.oracle.com [141.146.40.155]) by acsinet15.oracle.com (Switch-3.4.2/Switch-3.4.1) with ESMTP id o6UIINgd015502; Fri, 30 Jul 2010 20:10:21 +0000 (GMT) Received: from abhmt012.oracle.com by acsmt355.oracle.com with ESMTP id 453786731280520519; Fri, 30 Jul 2010 13:08:39 -0700 Received: from [172.20.25.27] (/10.85.25.27) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 30 Jul 2010 13:08:38 -0700 Date: Fri, 30 Jul 2010 14:08:38 -0600 From: Tim Haley Subject: Read-only ZFS pools [PSARC/2010/306 FastTrack timeout 08/06/2010] To: PSARC-ext@sun.com Cc: zfs-team@sun.com Message-id: <4C533146.3060702@oracle.com> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7BIT X-PMX-Version: 5.4.1.325704 X-Source-IP: acsmt355.oracle.com [141.146.40.155] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090202.4C5331AF.0071:SCFMA4539814,ss=1,fgs=0 User-Agent: Mozilla/5.0 (X11; U; SunOS i86pc; en-US; rv:1.9.2.4) Gecko/20100705 Thunderbird/3.1 Status: RO Content-Length: 3769 I am sponsoring the following fast-track for George Wilson. This case introduces the ability to import ZFS pools in a read-only mode. Requested binding is micro/patch. Timeout is 8/6/2010. Template Version: @(#)sac_nextcase 1.70 03/30/10 SMI This information is Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. 1. Introduction 1.1. Project/Component Working Name: Read-only ZFS pools 1.2. Name of Document Author/Supplier: Author: George Wilson 1.3 Date of This Document: 30 July, 2010 4. Technical Description OVERVIEW: When a ZFS pool is imported, all of its filesystems are mounted and the pool is imported in read-write mode. Although it's possible to mount the individual filesystems in read-only mode during the import, the pool continues to operate in a read-write fashion. This proposal introduces new functionality which will allow the administrator to better control how ZFS pools are imported. PROPOSED SOLUTION: This case introduces a new pool-level property, 'readonly', and a new command line flag for the 'zpool import' sub-command. The new pool-level property is a non-persistent property and can only be set when importing a pool. The default value of 'readonly' will be 'off' (read-write) and can be overridden at import time to make the pool read-only. # zpool import -o readonly=on tank When the 'readonly' property is 'on' (read-only) the following actions are performed: 1). pool is loaded but transaction processing is disabled 2). all filesystems and zvols are mounted in read-only mode 3). any intent-log replays are deferred (any pending synchronous writes will be replayed once the pool is imported read-write) The following restrictions apply when a pool is read-only: 1). Attempts to set additional zpool-level properties during import are ignored. 2). All filesystem mounts are converted to include the 'ro' mount option. 3). Additional mount options may be set on a temporary basis. A pool which has been imported read-only can be restored back to read-write by exporting and reimporting it. In addition, a new option, '-N', will be added to the 'zpool import' sub-command. This will provide the ability to import a pool but prevents any filesystem from being mounted. # zpool import -N tank MANPAGE DIFFS: zpool import [-o mntopts] [-p property=value] ... [-d dir | -c cachefile] - [-D] [-f] [-m] [-R root] [-F [-n]] -a + [-D] [-f] [-m] [-N] [-R root] [-F [-n]] -a + The following property can be set at import time: + + readonly=on | off + + Controls whether the pool can be modified. When enabled, + any synchronous data which exists only on the intent log + will not be accessible until the pool is re-imported in + read-write mode. The following properties can be set at creation time and import time, and later changed with the zpool set command: zpool import [-o mntopts] [-o property=value] ... [-d dir | -c cachefile] - -c cachefile] [-D] [-f] [-m] [-R root] [-F [-n]] -a + -c cachefile] [-D] [-f] [-m] [-N] [-R root] [-F [-n]] -a + -N + + Import the pool without mounting any file systems. 6. Resources and Schedule 6.4. Steering Committee requested information 6.4.1. Consolidation C-team Name: ON 6.5. ARC review type: FastTrack 6.6. ARC Exposure: open From bill.sommerfeld@oracle.com Fri Jul 30 16:51:02 2010 Received: from newsunmail1brm.central.sun.com (newsunmail1brm.Central.Sun.COM [129.147.62.245]) by sac.sfbay.sun.com (8.13.8+Sun/8.13.8) with ESMTP id o6UNp1tb011283 for ; Fri, 30 Jul 2010 16:51:01 -0700 (PDT) Received: from nwk-avmta-2.sfbay.sun.com (nwk-avmta-2.SFBay.Sun.COM [129.145.155.6]) by newsunmail1brm.central.sun.com (8.13.7+Sun/8.13.7/ENSMAIL,v2.4) with ESMTP id o6UNp1VZ036304; Fri, 30 Jul 2010 17:51:01 -0600 (MDT) Received: from pmxchannel-daemon.nwk-avmta-2.sfbay.sun.com by nwk-avmta-2.sfbay.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) id <0L6E00501A910P00@nwk-avmta-2.sfbay.sun.com>; Fri, 30 Jul 2010 16:51:01 -0700 (PDT) Received: from brmea-mail-1.sun.com ([192.18.98.31]) by nwk-avmta-2.sfbay.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) with ESMTP id <0L6E00L7FA90A1E0@nwk-avmta-2.sfbay.sun.com>; Fri, 30 Jul 2010 16:51:00 -0700 (PDT) Received: from rcsinet15.oracle.com (rcsinet15.oracle.com [148.87.113.117]) by brmea-mail-1.sun.com (8.13.6+Sun/8.12.9) with ESMTP id o6UNp0oU019895; Fri, 30 Jul 2010 23:51:00 +0000 (GMT) Received: from acsmt355.oracle.com (acsmt355.oracle.com [141.146.40.155]) by rcsinet15.oracle.com (Switch-3.4.2/Switch-3.4.1) with ESMTP id o6UMjl2G018020; Fri, 30 Jul 2010 23:50:59 +0000 (GMT) Received: from abhmt014.oracle.com by acsmt354.oracle.com with ESMTP id 472525181280533850; Fri, 30 Jul 2010 16:50:50 -0700 Received: from [10.7.251.192] (/10.7.251.192) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 30 Jul 2010 16:50:50 -0700 Date: Fri, 30 Jul 2010 16:50:48 -0700 From: Bill Sommerfeld Subject: Re: Read-only ZFS pools [PSARC/2010/306 FastTrack timeout 08/06/2010] In-reply-to: <4C533146.3060702@oracle.com> To: Tim Haley Cc: PSARC-ext@sun.com, zfs-team@sun.com Message-id: <4C536558.2080002@oracle.com> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7BIT X-PMX-Version: 5.4.1.325704 X-Source-IP: acsmt355.oracle.com [141.146.40.155] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090206.4C536563.02C7:SCFMA4539814,ss=1,fgs=0 References: <4C533146.3060702@oracle.com> User-Agent: Mozilla/5.0 (X11; U; SunOS i86pc; en-US; rv:1.9.1.10) Gecko/20100621 Lightning/1.0b1 Thunderbird/3.0.5 Status: RO Content-Length: 853 On 07/30/10 13:08, Tim Haley wrote: > When the 'readonly' property is 'on' (read-only) the following actions > are performed: > > 1). pool is loaded but transaction processing is disabled > 2). all filesystems and zvols are mounted in read-only mode > 3). any intent-log replays are deferred (any pending synchronous > writes will be replayed once the pool is imported read-write) What's the behavior with respect to writes to the underlying storage device(s)? 1) when a pool is imported read-only, are writes ever issued to the underlying storage? (for instance, for mirror self-healing after a checksum failure)? 2) is it possible to import, read-only, a pool stored on a write-protected device or set of devices? (in other words, one which has to be opened O_RDONLY or equivalent, and/or a device for which all writes fail?) - Bill From george.r.wilson@oracle.com Fri Jul 30 16:57:44 2010 Received: from sunmail6brm.central.sun.com (sunmail6brm.Central.Sun.COM [129.147.4.169]) by sac.sfbay.sun.com (8.13.8+Sun/8.13.8) with ESMTP id o6UNvh3g011656 for ; Fri, 30 Jul 2010 16:57:44 -0700 (PDT) Received: from brm-avmta-1.central.sun.com (brm-avmta-1.Central.Sun.COM [129.147.4.11]) by sunmail6brm.central.sun.com (8.13.8+Sun/8.13.8/ENSMAIL,v2.4) with ESMTP id o6UNvhhj027326; Fri, 30 Jul 2010 18:57:43 -0500 (CDT) Received: from pmxchannel-daemon.brm-avmta-1.central.sun.com by brm-avmta-1.central.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) id <0L6E00L03AK79L00@brm-avmta-1.central.sun.com>; Fri, 30 Jul 2010 17:57:43 -0600 (MDT) Received: from brmea-mail-1.sun.com ([192.18.98.31]) by brm-avmta-1.central.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) with ESMTP id <0L6E0050ZAK7MJ60@brm-avmta-1.central.sun.com>; Fri, 30 Jul 2010 17:57:43 -0600 (MDT) Received: from acsinet15.oracle.com (acsinet15.oracle.com [141.146.126.227]) by brmea-mail-1.sun.com (8.13.6+Sun/8.12.9) with ESMTP id o6UNvg6x021516; Fri, 30 Jul 2010 23:57:42 +0000 (GMT) Received: from acsmt355.oracle.com (acsmt355.oracle.com [141.146.40.155]) by acsinet15.oracle.com (Switch-3.4.2/Switch-3.4.1) with ESMTP id o6UJemle030252; Fri, 30 Jul 2010 23:57:41 +0000 (GMT) Received: from abhmt006.oracle.com by acsmt354.oracle.com with ESMTP id 454260991280534193; Fri, 30 Jul 2010 16:56:33 -0700 Received: from wombat.local (/10.7.251.233) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 30 Jul 2010 16:56:33 -0700 Date: Fri, 30 Jul 2010 16:56:32 -0700 From: George Wilson Subject: Re: Read-only ZFS pools [PSARC/2010/306 FastTrack timeout 08/06/2010] In-reply-to: <4C536558.2080002@oracle.com> To: Bill Sommerfeld Cc: Tim Haley , PSARC-ext@sun.com, zfs-team@sun.com Message-id: <4C5366B0.3060108@oracle.com> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7BIT X-PMX-Version: 5.4.1.325704 X-Source-IP: acsmt355.oracle.com [141.146.40.155] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090202.4C5366F6.00E4:SCFMA4539814,ss=1,fgs=0 References: <4C533146.3060702@oracle.com> <4C536558.2080002@oracle.com> User-Agent: Thunderbird 2.0.0.24 (Macintosh/20100228) Status: RO Content-Length: 1215 Bill Sommerfeld wrote: > On 07/30/10 13:08, Tim Haley wrote: >> When the 'readonly' property is 'on' (read-only) the following actions >> are performed: >> >> 1). pool is loaded but transaction processing is disabled >> 2). all filesystems and zvols are mounted in read-only mode >> 3). any intent-log replays are deferred (any pending synchronous >> writes will be replayed once the pool is imported read-write) > > What's the behavior with respect to writes to the underlying storage > device(s)? > > 1) when a pool is imported read-only, are writes ever issued to the > underlying storage? (for instance, for mirror self-healing after a > checksum failure)? We won't do any self-healing when the pool is read-only. When imported in this fashion the pool is guaranteed not to change. > > 2) is it possible to import, read-only, a pool stored on a > write-protected device or set of devices? (in other words, one which > has to be opened O_RDONLY or equivalent, and/or a device for which all > writes fail?) Are you asking if this can be done automatically? In other words, can ZFS detect that the storage is write-protected and convert to read-only? - George > > - Bill > From bill.sommerfeld@oracle.com Fri Jul 30 18:39:17 2010 Received: from newsunmail1brm.central.sun.com (newsunmail1brm.Central.Sun.COM [129.147.62.245]) by sac.sfbay.sun.com (8.13.8+Sun/8.13.8) with ESMTP id o6V1dHvA013746 for ; Fri, 30 Jul 2010 18:39:17 -0700 (PDT) Received: from nwk-avmta-2.sfbay.sun.com (nwk-avmta-2.SFBay.Sun.COM [129.145.155.6]) by newsunmail1brm.central.sun.com (8.13.7+Sun/8.13.7/ENSMAIL,v2.4) with ESMTP id o6V1dG0c009873; Fri, 30 Jul 2010 19:39:17 -0600 (MDT) Received: from pmxchannel-daemon.nwk-avmta-2.sfbay.sun.com by nwk-avmta-2.sfbay.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) id <0L6E00B07F9GC000@nwk-avmta-2.sfbay.sun.com>; Fri, 30 Jul 2010 18:39:16 -0700 (PDT) Received: from brmea-mail-2.sun.com ([192.18.98.43]) by nwk-avmta-2.sfbay.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) with ESMTP id <0L6E005P8F9GFC20@nwk-avmta-2.sfbay.sun.com>; Fri, 30 Jul 2010 18:39:16 -0700 (PDT) Received: from rcsinet13.oracle.com (rcsinet13.oracle.com [148.87.113.125]) by brmea-mail-2.sun.com (8.13.6+Sun/8.12.9) with ESMTP id o6V1dFJH021118; Sat, 31 Jul 2010 01:39:15 +0000 (GMT) Received: from acsmt354.oracle.com (acsmt354.oracle.com [141.146.40.154]) by rcsinet13.oracle.com (Switch-3.4.2/Switch-3.4.1) with ESMTP id o6V1dDGs022609; Sat, 31 Jul 2010 01:39:13 +0000 (GMT) Received: from abhmt015.oracle.com by acsmt353.oracle.com with ESMTP id 472625401280540259; Fri, 30 Jul 2010 18:37:39 -0700 Received: from [10.7.251.192] (/10.7.251.192) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 30 Jul 2010 18:37:39 -0700 Date: Fri, 30 Jul 2010 18:37:38 -0700 From: Bill Sommerfeld Subject: Re: Read-only ZFS pools [PSARC/2010/306 FastTrack timeout 08/06/2010] In-reply-to: <4C5366B0.3060108@oracle.com> To: George Wilson Cc: Tim Haley , PSARC-ext@sun.com, zfs-team@sun.com Message-id: <4C537E62.5080607@oracle.com> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7BIT X-PMX-Version: 5.4.1.325704 X-Source-IP: acsmt354.oracle.com [141.146.40.154] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090207.4C537EC3.0251:SCFMA4539814,ss=1,fgs=0 References: <4C533146.3060702@oracle.com> <4C536558.2080002@oracle.com> <4C5366B0.3060108@oracle.com> User-Agent: Mozilla/5.0 (X11; U; SunOS i86pc; en-US; rv:1.9.1.10) Gecko/20100621 Lightning/1.0b1 Thunderbird/3.0.5 Status: RO Content-Length: 835 On 07/30/10 16:56, George Wilson wrote: >> 2) is it possible to import, read-only, a pool stored on a >> write-protected device or set of devices? (in other words, one which >> has to be opened O_RDONLY or equivalent, and/or a device for which all >> writes fail?) > > Are you asking if this can be done automatically? In other words, can > ZFS detect that the storage is write-protected and convert to read-only? No. I'm merely asking if, when you do a read-only import, zfs opens the underlying storage read-only & doesn't ever attempt to write to it. (It sounds like this is the case). The spec discussed the read-only-ness entirely from the perspective of what sits on top of zfs, not what sits underneath it. I just wanted a little more precision on what happens below zfs when you do a read-only import. - Bill From george.r.wilson@oracle.com Fri Jul 30 18:48:05 2010 Received: from sunmail2sca.sfbay.sun.com (sunmail2sca.SFBay.Sun.COM [129.145.155.234]) by sac.sfbay.sun.com (8.13.8+Sun/8.13.8) with ESMTP id o6V1m5Ux013778 for ; Fri, 30 Jul 2010 18:48:05 -0700 (PDT) Received: from brm-avmta-1.central.sun.com (brm-avmta-1.Central.Sun.COM [129.147.4.11]) by sunmail2sca.sfbay.sun.com (8.13.8+Sun/8.13.8/ENSMAIL,v2.4) with ESMTP id o6V1m1kB015139; Fri, 30 Jul 2010 18:48:04 -0700 (PDT) Received: from pmxchannel-daemon.brm-avmta-1.central.sun.com by brm-avmta-1.central.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) id <0L6E0080XFO3SG00@brm-avmta-1.central.sun.com>; Fri, 30 Jul 2010 19:48:03 -0600 (MDT) Received: from sca-ea-mail-2.sun.com ([192.18.43.25]) by brm-avmta-1.central.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) with ESMTP id <0L6E005I2FO3MN90@brm-avmta-1.central.sun.com>; Fri, 30 Jul 2010 19:48:03 -0600 (MDT) Received: from rcsinet13.oracle.com (rcsinet13.oracle.com [148.87.113.125]) by sca-ea-mail-2.sun.com (8.13.7+Sun/8.12.9) with ESMTP id o6V1m2ws025930; Sat, 31 Jul 2010 01:48:02 +0000 (GMT) Received: from acsmt355.oracle.com (acsmt355.oracle.com [141.146.40.155]) by rcsinet13.oracle.com (Switch-3.4.2/Switch-3.4.1) with ESMTP id o6V1DMml020401; Sat, 31 Jul 2010 01:48:01 +0000 (GMT) Received: from abhmt005.oracle.com by acsmt353.oracle.com with ESMTP id 454394581280540802; Fri, 30 Jul 2010 18:46:42 -0700 Received: from wombat.local (/10.7.251.233) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 30 Jul 2010 18:46:42 -0700 Date: Fri, 30 Jul 2010 18:46:37 -0700 From: George Wilson Subject: Re: Read-only ZFS pools [PSARC/2010/306 FastTrack timeout 08/06/2010] In-reply-to: <4C537E62.5080607@oracle.com> To: Bill Sommerfeld Cc: Tim Haley , PSARC-ext@sun.com, zfs-team@sun.com Message-id: <4C53807D.8010709@oracle.com> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7BIT X-PMX-Version: 5.4.1.325704 X-Source-IP: acsmt355.oracle.com [141.146.40.155] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090201.4C5380D2.007B:SCFMA4539814,ss=1,fgs=0 References: <4C533146.3060702@oracle.com> <4C536558.2080002@oracle.com> <4C5366B0.3060108@oracle.com> <4C537E62.5080607@oracle.com> User-Agent: Thunderbird 2.0.0.24 (Macintosh/20100228) Status: RO Content-Length: 651 Bill Sommerfeld wrote: > On 07/30/10 16:56, George Wilson wrote: > > No. > > I'm merely asking if, when you do a read-only import, zfs opens the > underlying storage read-only & doesn't ever attempt to write to it. > > (It sounds like this is the case). > > The spec discussed the read-only-ness entirely from the perspective of > what sits on top of zfs, not what sits underneath it. I just wanted a > little more precision on what happens below zfs when you do a read-only > import. Thanks for clarifying this. Yes, the pool will not do any writes to any part of the pool. As a matter of fact all devices are opened read-only. - George From michael.kearney@oracle.com Wed Aug 4 10:08:38 2010 Received: from sunmail6brm.central.sun.com (sunmail6brm.Central.Sun.COM [129.147.4.169]) by sac.sfbay.sun.com (8.13.8+Sun/8.13.8) with ESMTP id o74H8cF9007871 for ; Wed, 4 Aug 2010 10:08:38 -0700 (PDT) Received: from brm-avmta-1.central.sun.com (brm-avmta-1.Central.Sun.COM [129.147.4.11]) by sunmail6brm.central.sun.com (8.13.8+Sun/8.13.8/ENSMAIL,v2.4) with ESMTP id o74H8bM5001638; Wed, 4 Aug 2010 12:08:37 -0500 (CDT) Received: from pmxchannel-daemon.brm-avmta-1.central.sun.com by brm-avmta-1.central.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) id <0L6N00G090YDNQ00@brm-avmta-1.central.sun.com>; Wed, 04 Aug 2010 11:08:37 -0600 (MDT) Received: from sca-ea-mail-1.sun.com ([192.18.43.24]) by brm-avmta-1.central.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) with ESMTP id <0L6N00C4X0YDBB20@brm-avmta-1.central.sun.com>; Wed, 04 Aug 2010 11:08:37 -0600 (MDT) Received: from rcsinet13.oracle.com (rcsinet13.oracle.com [148.87.113.125]) by sca-ea-mail-1.sun.com (8.13.7+Sun/8.12.9) with ESMTP id o74H8aAm025713; Wed, 04 Aug 2010 17:08:36 +0000 (GMT) Received: from acsmt354.oracle.com (acsmt354.oracle.com [141.146.40.154]) by rcsinet13.oracle.com (Switch-3.4.2/Switch-3.4.1) with ESMTP id o74H8QIS004801; Wed, 04 Aug 2010 17:08:27 +0000 (GMT) Received: from abhmt013.oracle.com by acsmt354.oracle.com with ESMTP id 484971691280941704; Wed, 04 Aug 2010 10:08:24 -0700 Received: from [129.147.223.4] (/129.147.223.4) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 04 Aug 2010 10:08:23 -0700 Date: Wed, 04 Aug 2010 11:08:18 -0600 From: Michael Kearney Subject: Re: Read-only ZFS pools [PSARC/2010/306 FastTrack timeout 08/06/2010] In-reply-to: <4C533146.3060702@oracle.com> To: Tim Haley Cc: PSARC-ext@sun.com, zfs-team@sun.com Message-id: <4C599E82.8030806@oracle.com> MIME-version: 1.0 Content-type: multipart/alternative; boundary="Boundary_(ID_lzoGevgh++G6giyPGv0N8w)" X-PMX-Version: 5.4.1.325704 X-Source-IP: acsmt354.oracle.com [141.146.40.154] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090208.4C599E93.01CD:SCFMA4539814,ss=1,fgs=0 References: <4C533146.3060702@oracle.com> User-Agent: Thunderbird 2.0.0.23 (Windows/20090812) Status: RO Content-Length: 67955 This is a multi-part message in MIME format. --Boundary_(ID_lzoGevgh++G6giyPGv0N8w) Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7BIT *+1* On 7/30/2010 2:08 PM, Tim Haley wrote: > I am sponsoring the following fast-track for George Wilson. This case > introduces the ability to import ZFS pools in a read-only mode. > Requested binding is micro/patch. Timeout is 8/6/2010. > > Template Version: @(#)sac_nextcase 1.70 03/30/10 SMI > This information is Copyright (c) 2010, Oracle and/or its affiliates. > All rights reserved. > 1. Introduction > 1.1. Project/Component Working Name: > Read-only ZFS pools > 1.2. Name of Document Author/Supplier: > Author: George Wilson > 1.3 Date of This Document: > 30 July, 2010 > > 4. Technical Description > > OVERVIEW: > > When a ZFS pool is imported, all of its filesystems are > mounted and the > pool is imported in read-write mode. Although it's possible > to mount > the individual filesystems in read-only mode during the > import, the > pool continues to operate in a read-write fashion. This proposal > introduces new functionality which will allow the > administrator to > better control how ZFS pools are imported. > > PROPOSED SOLUTION: > > This case introduces a new pool-level property, 'readonly', and a > new command line flag for the 'zpool import' sub-command. > > The new pool-level property is a non-persistent property and > can only be set when importing a pool. The default value of > 'readonly' will be 'off' (read-write) and can be overridden at > import > time to make the pool read-only. > > # zpool import -o readonly=on tank > > When the 'readonly' property is 'on' (read-only) the following > actions > are performed: > > 1). pool is loaded but transaction processing is disabled > 2). all filesystems and zvols are mounted in read-only mode > 3). any intent-log replays are deferred (any pending synchronous > writes will be replayed once the pool is imported read-write) > > The following restrictions apply when a pool is read-only: > > 1). Attempts to set additional zpool-level properties during > import > are ignored. > 2). All filesystem mounts are converted to include the 'ro' > mount option. > 3). Additional mount options may be set on a temporary basis. > > A pool which has been imported read-only can be restored back > to read-write by exporting and reimporting it. > > In addition, a new option, '-N', will be added to the 'zpool > import' > sub-command. This will provide the ability to import a pool but > prevents any filesystem from being mounted. > > # zpool import -N tank > > MANPAGE DIFFS: > > zpool import [-o mntopts] [-p property=value] ... [-d dir | -c > cachefile] > - [-D] [-f] [-m] [-R root] [-F [-n]] -a > + [-D] [-f] [-m] [-N] [-R root] [-F [-n]] -a > > + The following property can be set at import time: > + > + readonly=on | off > + > + Controls whether the pool can be modified. When enabled, > + any synchronous data which exists only on the intent log > + will not be accessible until the pool is re-imported in > + read-write mode. > > The following properties can be set at creation time and > import time, and later changed with the zpool set command: > > > zpool import [-o mntopts] [-o property=value] ... [-d dir | -c > cachefile] > - -c cachefile] [-D] [-f] [-m] [-R root] [-F [-n]] -a > + -c cachefile] [-D] [-f] [-m] [-N] [-R root] [-F [-n]] -a > > + -N > + > + Import the pool without mounting any file systems. > > 6. Resources and Schedule > 6.4. Steering Committee requested information > 6.4.1. Consolidation C-team Name: > ON > 6.5. ARC review type: FastTrack > 6.6. ARC Exposure: open > > -- * Michael Kearney * Principal Software Engineer *Oracle Corp.* MS UBRM05-390, 500 Eldorado Blvd Broomfield, CO 80021 US Phone 303-272-2402 Fax 303-272-6554 Email Michael.Kearney@Oracle.COM --Boundary_(ID_lzoGevgh++G6giyPGv0N8w) Content-type: multipart/related; boundary="Boundary_(ID_H9xX29PRzroFOoh03FRoYA)" --Boundary_(ID_H9xX29PRzroFOoh03FRoYA) Content-type: text/html; charset=ISO-8859-1 Content-transfer-encoding: 7BIT +1

On 7/30/2010 2:08 PM, Tim Haley wrote:
I am sponsoring the following fast-track for George Wilson.  This case
introduces the ability to import ZFS pools in a read-only mode.
Requested binding is micro/patch.  Timeout is 8/6/2010.

Template Version: @(#)sac_nextcase 1.70 03/30/10 SMI
This information is Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
1. Introduction
    1.1. Project/Component Working Name:
         Read-only ZFS pools
    1.2. Name of Document Author/Supplier:
         Author:  George Wilson
    1.3  Date of This Document:
        30 July, 2010

4. Technical Description

OVERVIEW:

        When a ZFS pool is imported, all of its filesystems are mounted and the
        pool is imported in read-write mode.   Although it's possible to mount
        the individual filesystems in read-only mode during the import, the
        pool continues to operate in a read-write fashion.  This proposal
        introduces new functionality which will allow the administrator to
        better control how ZFS pools are imported.

PROPOSED SOLUTION:

        This case introduces a new pool-level property, 'readonly', and a
        new command line flag for the 'zpool import' sub-command.

        The new pool-level property is a non-persistent property and
        can only be set when importing a pool.  The default value of
        'readonly' will be 'off' (read-write) and can be overridden at import
        time to make the pool read-only.

        # zpool import -o readonly=on tank

        When the 'readonly' property is 'on' (read-only) the following actions
        are performed:

        1). pool is loaded but transaction processing is disabled
        2). all filesystems and zvols are mounted in read-only mode
        3). any intent-log replays are deferred (any pending synchronous
            writes will be replayed once the pool is imported read-write)

        The following restrictions apply when a pool is read-only:

        1). Attempts to set additional zpool-level properties during import
            are ignored.
        2). All filesystem mounts are converted to include the 'ro'
            mount option.
        3). Additional mount options may be set on a temporary basis.

        A pool which has been imported read-only can be restored back
        to read-write by exporting and reimporting it.

        In addition, a new option, '-N', will be added to the 'zpool import'
        sub-command.  This will provide the ability to import a pool but
        prevents any filesystem from being mounted.

        # zpool import -N tank

MANPAGE DIFFS:

      zpool import [-o mntopts] [-p property=value] ... [-d dir | -c cachefile]
-          [-D] [-f] [-m] [-R root] [-F [-n]] -a
+          [-D] [-f] [-m] [-N] [-R root] [-F [-n]] -a

+       The following property can be set at import time:
+
+       readonly=on | off
+
+            Controls whether the pool can be modified.  When enabled,
+            any synchronous data which exists only on the intent log
+            will not be accessible until the pool is re-imported in
+            read-write mode.

        The following properties can be set  at  creation  time  and
        import time, and later changed with the zpool set command:


      zpool import [-o mntopts] [-o property=value] ... [-d dir | -c cachefile]
-     -c cachefile] [-D] [-f] [-m] [-R root] [-F [-n]] -a
+     -c cachefile] [-D] [-f] [-m] [-N] [-R root] [-F [-n]] -a

+       -N
+
+          Import the pool without mounting any file systems.

6. Resources and Schedule
    6.4. Steering Committee requested information
        6.4.1. Consolidation C-team Name:
                ON
    6.5. ARC review type: FastTrack
    6.6. ARC Exposure: open



--
Michael Kearney
Principal Software Engineer

Oracle Corp.
MS UBRM05-390, 500 Eldorado Blvd
Broomfield, CO 80021 US
Phone 303-272-2402
Fax 303-272-6554
Email Michael.Kearney@Oracle.COM
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7jUJBIZjYJdoiTt+ETBAFKOIg8gcEt3AjCXuoYlOzAMUo0gH21GRDVa84hmyqEUxcLGLYPgi GLcgxoQxZqGMZqQCGtMoBSuxMYxHfKMX4yhHMCixjmmgIx61QMQ9TgGIfswCDwNJhQsSkgr1 O+QSpqfITOigkVO4IyR/wLdJQmGQlkRCOzKphDVykgaS/GQNACnKm0SilELwJCq/dZBVAsEf rvwBvWK5igIIgpY3gCUubzDLXYLSlr4MpjDzEAIAOw== --Boundary_(ID_H9xX29PRzroFOoh03FRoYA)-- --Boundary_(ID_lzoGevgh++G6giyPGv0N8w)-- From Nicolas.Williams@oracle.com Wed Aug 4 10:17:55 2010 Received: from sunmail2sca.sfbay.sun.com (sunmail2sca.SFBay.Sun.COM [129.145.155.234]) by sac.sfbay.sun.com (8.13.8+Sun/8.13.8) with ESMTP id o74HHtqL008283 for ; Wed, 4 Aug 2010 10:17:55 -0700 (PDT) Received: from brm-avmta-1.central.sun.com (brm-avmta-1.Central.Sun.COM [129.147.4.11]) by sunmail2sca.sfbay.sun.com (8.13.8+Sun/8.13.8/ENSMAIL,v2.4) with ESMTP id o74HHrnB014174; Wed, 4 Aug 2010 10:17:55 -0700 (PDT) Received: from pmxchannel-daemon.brm-avmta-1.central.sun.com by brm-avmta-1.central.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) id <0L6N00H0H1DUFW00@brm-avmta-1.central.sun.com>; Wed, 04 Aug 2010 11:17:54 -0600 (MDT) Received: from brmea-mail-1.sun.com ([192.18.98.31]) by brm-avmta-1.central.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) with ESMTP id <0L6N00C6S1DTB420@brm-avmta-1.central.sun.com>; Wed, 04 Aug 2010 11:17:53 -0600 (MDT) Received: from acsinet15.oracle.com (acsinet15.oracle.com [141.146.126.227]) by brmea-mail-1.sun.com (8.13.6+Sun/8.12.9) with ESMTP id o74HHq6R019723; Wed, 04 Aug 2010 17:17:52 +0000 (GMT) Received: from acsmt354.oracle.com (acsmt354.oracle.com [141.146.40.154]) by acsinet15.oracle.com (Switch-3.4.2/Switch-3.4.1) with ESMTP id o747ESIj027218; Wed, 04 Aug 2010 17:17:52 +0000 (GMT) Received: from abhmt019.oracle.com by acsmt355.oracle.com with ESMTP id 485002111280942271; Wed, 04 Aug 2010 10:17:51 -0700 Received: from oracle.com (/129.153.128.104) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 04 Aug 2010 10:17:49 -0700 Date: Wed, 04 Aug 2010 12:17:45 -0500 From: Nicolas Williams Subject: Re: Read-only ZFS pools [PSARC/2010/306 FastTrack timeout 08/06/2010] In-reply-to: <4C533146.3060702@oracle.com> To: Tim Haley Cc: PSARC-ext@sun.com, zfs-team@sun.com Message-id: <20100804171744.GB5217@oracle.com> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7BIT Content-disposition: inline X-PMX-Version: 5.4.1.325704 X-Source-IP: acsmt354.oracle.com [141.146.40.154] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090209.4C59A0C0.01E1:SCFMA4539814,ss=1,fgs=0 References: <4C533146.3060702@oracle.com> User-Agent: Mutt/1.5.20 (2010-03-02) Status: RO Content-Length: 167 Can two hosts import the same pool read-only? What happens if one host imports a pool read-only, then later another imports it read-write? "Don't do that"? Nico -- From george.r.wilson@oracle.com Wed Aug 4 11:37:49 2010 Received: from sunmail3mpk.sfbay.sun.com (sunmail3mpk.SFBay.Sun.COM [129.146.11.52]) by sac.sfbay.sun.com (8.13.8+Sun/8.13.8) with ESMTP id o74IbnOv011127 for ; Wed, 4 Aug 2010 11:37:49 -0700 (PDT) Received: from brm-avmta-1.central.sun.com (brm-avmta-1.Central.Sun.COM [129.147.4.11]) by sunmail3mpk.sfbay.sun.com (8.13.8+Sun/8.13.8/ENSMAIL,v2.4) with ESMTP id o74IbnNn029546; Wed, 4 Aug 2010 11:37:49 -0700 (PDT) Received: from pmxchannel-daemon.brm-avmta-1.central.sun.com by brm-avmta-1.central.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) id <0L6N0015T5306N00@brm-avmta-1.central.sun.com>; Wed, 04 Aug 2010 12:37:48 -0600 (MDT) Received: from brmea-mail-2.sun.com ([192.18.98.43]) by brm-avmta-1.central.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) with ESMTP id <0L6N00CQX530BC50@brm-avmta-1.central.sun.com>; Wed, 04 Aug 2010 12:37:48 -0600 (MDT) Received: from acsinet15.oracle.com (acsinet15.oracle.com [141.146.126.227]) by brmea-mail-2.sun.com (8.13.6+Sun/8.12.9) with ESMTP id o74IblpD003807; Wed, 04 Aug 2010 18:37:47 +0000 (GMT) Received: from acsmt354.oracle.com (acsmt354.oracle.com [141.146.40.154]) by acsinet15.oracle.com (Switch-3.4.2/Switch-3.4.1) with ESMTP id o74IbfjL024127; Wed, 04 Aug 2010 18:37:41 +0000 (GMT) Received: from abhmt019.oracle.com by acsmt354.oracle.com with ESMTP id 466300941280946966; Wed, 04 Aug 2010 11:36:06 -0700 Received: from wombat.local (/10.7.251.233) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 04 Aug 2010 11:36:04 -0700 Date: Wed, 04 Aug 2010 11:36:03 -0700 From: George Wilson Subject: Re: Read-only ZFS pools [PSARC/2010/306 FastTrack timeout 08/06/2010] In-reply-to: <20100804171744.GB5217@oracle.com> To: Nicolas Williams Cc: Tim Haley , PSARC-ext@sun.com, zfs-team@sun.com Message-id: <4C59B313.8080305@oracle.com> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7BIT X-PMX-Version: 5.4.1.325704 X-Source-IP: acsmt354.oracle.com [141.146.40.154] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090206.4C59B37A.00D1:SCFMA4539814,ss=1,fgs=0 References: <4C533146.3060702@oracle.com> <20100804171744.GB5217@oracle.com> User-Agent: Thunderbird 2.0.0.24 (Macintosh/20100228) Status: RO Content-Length: 444 Nicolas Williams wrote: > Can two hosts import the same pool read-only? What happens if one host > imports a pool read-only, then later another imports it read-write? > "Don't do that"? > > Nico Yes, you can import this on two hosts read-only. If one host later import it read-write then the read-only host may see stale data since it won't know to invalidate any cached data. This would fall into the "Don't do that" category. - George From torrey.mcmahon@oracle.com Wed Aug 4 11:45:01 2010 Received: from sunmail6brm.central.sun.com (sunmail6brm.Central.Sun.COM [129.147.4.169]) by sac.sfbay.sun.com (8.13.8+Sun/8.13.8) with ESMTP id o74Ij17B011164 for ; Wed, 4 Aug 2010 11:45:01 -0700 (PDT) Received: from nwk-avmta-2.sfbay.sun.com (nwk-avmta-2.SFBay.Sun.COM [129.145.155.6]) by sunmail6brm.central.sun.com (8.13.8+Sun/8.13.8/ENSMAIL,v2.4) with ESMTP id o74Iiwgg014115; Wed, 4 Aug 2010 13:45:00 -0500 (CDT) Received: from pmxchannel-daemon.nwk-avmta-2.sfbay.sun.com by nwk-avmta-2.sfbay.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) id <0L6N0000H5EZLR00@nwk-avmta-2.sfbay.sun.com>; Wed, 04 Aug 2010 11:44:59 -0700 (PDT) Received: from brmea-mail-4.sun.com ([192.18.98.36]) by nwk-avmta-2.sfbay.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) with ESMTP id <0L6N000QP5EYAE00@nwk-avmta-2.sfbay.sun.com>; Wed, 04 Aug 2010 11:44:58 -0700 (PDT) Received: from acsinet15.oracle.com (acsinet15.oracle.com [141.146.126.227]) by brmea-mail-4.sun.com (8.13.6+Sun/8.12.9) with ESMTP id o74IiwI6002354; Wed, 04 Aug 2010 18:44:58 +0000 (GMT) Received: from acsmt355.oracle.com (acsmt355.oracle.com [141.146.40.155]) by acsinet15.oracle.com (Switch-3.4.2/Switch-3.4.1) with ESMTP id o74F5I3E010338; Wed, 04 Aug 2010 18:44:48 +0000 (GMT) Received: from abhmt013.oracle.com by acsmt355.oracle.com with ESMTP id 485280771280947387; Wed, 04 Aug 2010 11:43:07 -0700 Received: from [192.168.0.199] (/69.143.13.4) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 04 Aug 2010 11:43:06 -0700 Date: Wed, 04 Aug 2010 14:43:06 -0400 From: Torrey McMahon Subject: Re: Read-only ZFS pools [PSARC/2010/306 FastTrack timeout 08/06/2010] In-reply-to: <4C59B313.8080305@oracle.com> To: George Wilson Cc: Nicolas Williams , Tim Haley , PSARC-ext@sun.com, zfs-team@sun.com Message-id: <4C59B4BA.4050809@oracle.com> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7BIT X-PMX-Version: 5.4.1.325704 X-Source-IP: acsmt355.oracle.com [141.146.40.155] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090204.4C59B529.01A8:SCFMA4539814,ss=1,fgs=0 References: <4C533146.3060702@oracle.com> <20100804171744.GB5217@oracle.com> <4C59B313.8080305@oracle.com> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.7) Gecko/20100713 Lightning/1.0b2pre OracleBeehiveExtension/1.0.0.0-Champion Thunderbird/3.1.1 Status: RO Content-Length: 664 On 8/4/2010 2:36 PM, George Wilson wrote: > Nicolas Williams wrote: >> Can two hosts import the same pool read-only? What happens if one host >> imports a pool read-only, then later another imports it read-write? >> "Don't do that"? >> >> Nico > > Yes, you can import this on two hosts read-only. If one host later > import it read-write then the read-only host may see stale data since > it won't know to invalidate any cached data. This would fall into the > "Don't do that" category. Is there any way to warn the admin doing this at the time of import? "Hey, this pool is already opened read-write on host XYZ. You probably don't want to do this ...." From george.r.wilson@oracle.com Wed Aug 4 11:50:45 2010 Received: from sunmail6brm.central.sun.com (sunmail6brm.Central.Sun.COM [129.147.4.169]) by sac.sfbay.sun.com (8.13.8+Sun/8.13.8) with ESMTP id o74IojUq011180 for ; Wed, 4 Aug 2010 11:50:45 -0700 (PDT) Received: from nwk-avmta-2.sfbay.sun.com (nwk-avmta-2.SFBay.Sun.COM [129.145.155.6]) by sunmail6brm.central.sun.com (8.13.8+Sun/8.13.8/ENSMAIL,v2.4) with ESMTP id o74IoiQa016943; Wed, 4 Aug 2010 13:50:45 -0500 (CDT) Received: from pmxchannel-daemon.nwk-avmta-2.sfbay.sun.com by nwk-avmta-2.sfbay.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) id <0L6N000035OKW900@nwk-avmta-2.sfbay.sun.com>; Wed, 04 Aug 2010 11:50:44 -0700 (PDT) Received: from sca-ea-mail-2.sun.com ([192.18.43.25]) by nwk-avmta-2.sfbay.sun.com (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) with ESMTP id <0L6N000035OKAH10@nwk-avmta-2.sfbay.sun.com>; Wed, 04 Aug 2010 11:50:44 -0700 (PDT) Received: from acsinet15.oracle.com (acsinet15.oracle.com [141.146.126.227]) by sca-ea-mail-2.sun.com (8.13.7+Sun/8.12.9) with ESMTP id o74Iohxi015848; Wed, 04 Aug 2010 18:50:44 +0000 (GMT) Received: from acsmt355.oracle.com (acsmt355.oracle.com [141.146.40.155]) by acsinet15.oracle.com (Switch-3.4.2/Switch-3.4.1) with ESMTP id o74D84rS021816; Wed, 04 Aug 2010 18:50:42 +0000 (GMT) Received: from abhmt005.oracle.com by acsmt355.oracle.com with ESMTP id 466347421280947804; Wed, 04 Aug 2010 11:50:04 -0700 Received: from wombat.local (/10.7.251.233) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 04 Aug 2010 11:50:03 -0700 Date: Wed, 04 Aug 2010 11:50:01 -0700 From: George Wilson Subject: Re: Read-only ZFS pools [PSARC/2010/306 FastTrack timeout 08/06/2010] In-reply-to: <4C59B4BA.4050809@oracle.com> To: Torrey McMahon Cc: Nicolas Williams , Tim Haley , PSARC-ext@sun.com, zfs-team@sun.com Message-id: <4C59B659.5020400@oracle.com> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7BIT X-PMX-Version: 5.4.1.325704 X-Source-IP: acsmt355.oracle.com [141.146.40.155] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090208.4C59B683.0296:SCFMA4539814,ss=1,fgs=0 References: <4C533146.3060702@oracle.com> <20100804171744.GB5217@oracle.com> <4C59B313.8080305@oracle.com> <4C59B4BA.4050809@oracle.com> User-Agent: Thunderbird 2.0.0.24 (Macintosh/20100228) Status: RO Content-Length: 871 Torrey McMahon wrote: > On 8/4/2010 2:36 PM, George Wilson wrote: >> Nicolas Williams wrote: >>> Can two hosts import the same pool read-only? What happens if one host >>> imports a pool read-only, then later another imports it read-write? >>> "Don't do that"? >>> >>> Nico >> >> Yes, you can import this on two hosts read-only. If one host later >> import it read-write then the read-only host may see stale data since >> it won't know to invalidate any cached data. This would fall into the >> "Don't do that" category. > > Is there any way to warn the admin doing this at the time of import? > "Hey, this pool is already opened read-write on host XYZ. You probably > don't want to do this ...." There is already an existing warning mechanism with ZFS to handle this. The administrator would have had to use the '-f' option to override this check. - George From tim.haley@oracle.com Wed Aug 4 12:33:52 2010 Received: from sunmail3mpk.sfbay.sun.com (sunmail3mpk.SFBay.Sun.COM [129.146.11.52]) by sac.sfbay.sun.com (8.13.8+Sun/8.13.8) with ESMTP id o74JXqHo012351 for ; Wed, 4 Aug 2010 12:33:52 -0700 (PDT) Received: from nwk-avmta-1.SFBay.Sun.COM (nwk-avmta-1.SFBay.Sun.COM [129.146.11.74]) by sunmail3mpk.sfbay.sun.com (8.13.8+Sun/8.13.8/ENSMAIL,v2.4) with ESMTP id o74JXpAI020464; Wed, 4 Aug 2010 12:33:51 -0700 (PDT) Received: from pmxchannel-daemon.nwk-avmta-1.sfbay.Sun.COM by nwk-avmta-1.sfbay.Sun.COM (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) id <0L6N002037OFZ400@nwk-avmta-1.sfbay.Sun.COM>; Wed, 04 Aug 2010 12:33:51 -0700 (PDT) Received: from brmea-mail-2.sun.com ([192.18.98.43]) by nwk-avmta-1.sfbay.Sun.COM (Sun Java System Messaging Server 6.2-3.04 (built Jul 15 2005)) with ESMTP id <0L6N006X87OFVGE0@nwk-avmta-1.sfbay.Sun.COM>; Wed, 04 Aug 2010 12:33:51 -0700 (PDT) Received: from acsinet15.oracle.com (acsinet15.oracle.com [141.146.126.227]) by brmea-mail-2.sun.com (8.13.6+Sun/8.12.9) with ESMTP id o74JXo8X006038; Wed, 04 Aug 2010 19:33:50 +0000 (GMT) Received: from acsmt354.oracle.com (acsmt354.oracle.com [141.146.40.154]) by acsinet15.oracle.com (Switch-3.4.2/Switch-3.4.1) with ESMTP id o74JXiVr004011; Wed, 04 Aug 2010 19:33:45 +0000 (GMT) Received: from abhmt004.oracle.com by acsmt354.oracle.com with ESMTP id 466481861280950421; Wed, 04 Aug 2010 12:33:41 -0700 Received: from [172.20.25.27] (/10.85.25.27) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 04 Aug 2010 12:33:41 -0700 Date: Wed, 04 Aug 2010 13:33:40 -0600 From: Tim Haley Subject: Re: Read-only ZFS pools [PSARC/2010/306 FastTrack timeout 08/06/2010] In-reply-to: <4C59B4BA.4050809@oracle.com> To: PSARC-ext@sun.com Cc: zfs-team@sun.com Message-id: <4C59C094.1050609@oracle.com> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7BIT X-PMX-Version: 5.4.1.325704 X-Source-IP: acsmt354.oracle.com [141.146.40.154] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A0B0204.4C59C09D.0165:SCFMA4539814,ss=1,fgs=0 References: <4C533146.3060702@oracle.com> <20100804171744.GB5217@oracle.com> <4C59B313.8080305@oracle.com> <4C59B4BA.4050809@oracle.com> User-Agent: Mozilla/5.0 (X11; U; SunOS i86pc; en-US; rv:1.9.2.4) Gecko/20100719 Thunderbird/3.1 Status: RO Content-Length: 55 This case was approved in today's PSARC meeting. -tim