From sacadmin Thu Aug 31 15:30:39 2006 Received: from sunmail4.Singapore.Sun.COM (sunmail4.Singapore.Sun.COM [129.158.71.19]) by sac.sfbay.sun.com (8.13.6+Sun/8.13.6) with ESMTP id k7VMUccW004546 for ; Thu, 31 Aug 2006 15:30:38 -0700 (PDT) Received: from nwk-avmta-1.SFBay.Sun.COM (nwk-avmta-1.SFBay.Sun.COM [129.149.246.28]) by sunmail4.Singapore.Sun.COM (8.13.4+Sun/8.13.3/ENSMAIL,v2.2) with ESMTP id k7VMUFQe029170 for <@sunmail2.sfbay.sun.com:psarc@sun.com>; Fri, 1 Sep 2006 06:30:37 +0800 (SGT) Received: from pmxchannel-daemon.nwk-avmta-1.sfbay.Sun.COM by nwk-avmta-1.sfbay.Sun.COM (Sun Java System Messaging Server 6.2 (built Dec 2 2004)) id <0J4V00G39VUYV600@nwk-avmta-1.sfbay.Sun.COM> for psarc@sun.com (ORCPT psarc@sun.com); Thu, 31 Aug 2006 15:30:34 -0700 (PDT) Received: from sfbaymail2sca.sfbay.sun.com ([129.145.155.42]) by nwk-avmta-1.sfbay.Sun.COM (Sun Java System Messaging Server 6.2 (built Dec 2 2004)) with ESMTP id <0J4V006M1VUQ9SC0@nwk-avmta-1.sfbay.Sun.COM> for psarc@sun.com (ORCPT psarc@sun.com); Thu, 31 Aug 2006 15:30:27 -0700 (PDT) Received: from billybob.sfbay.sun.com (billybob.SFBay.Sun.COM [129.146.224.123]) by sfbaymail2sca.sfbay.sun.com (8.13.6+Sun/8.12.10/ENSMAIL,v2.2) with ESMTP id k7VMUPQB012324; Thu, 31 Aug 2006 15:30:26 -0700 (PDT) Received: from billybob (billybob [129.146.224.123]) by billybob.sfbay.sun.com (8.13.7+Sun/8.13.7) with SMTP id k7VMUWdM567861; Thu, 31 Aug 2006 15:30:32 -0700 (PDT) Date: Thu, 31 Aug 2006 15:30:32 -0700 (PDT) From: Shudong Zhou Subject: PSARC 2006/519 Metadevice Names in iostat/vmstat Output To: psarc@sun.com Cc: chris.horne@sun.com Reply-to: Shudong Zhou Message-id: <200608312230.k7VMUWdM567861@billybob.sfbay.sun.com> MIME-version: 1.0 X-Mailer: dtmail 1.3.0 @(#)CDE Version 1.7_13 SunOS 5.11 i86pc i386 Content-type: TEXT/plain; charset=us-ascii Content-transfer-encoding: 7BIT Content-MD5: WNbf7/+AaQ6K/KORpGY87w== X-PMX-Version: 5.2.0.264296 Status: RO Content-Length: 3098 I'm sponsoring the following fasttrack for Chris Horne. The timer is set to expire on 9/7/2006. Shudong Metadevice Names in iostat/vmstat Output Summary Seeking patch binding for change in iostat(1M) output for svm metadevice names (md(7d)) - command output would still be unstable. Proposal I am reimplementing the iostat(1M) code that determines the device name displayed by the '-n' option [1] to use the libdevinfo(3LIB) di_devlink interfaces[2]. As part of this, I am proposing a change in the way that md(7d) metadevice names are displayed by iostat(1M). The reason for the change is to make the behavior consistent for all combinations of local, remote, and 'friendly' [3] metadevice names. For metadevice names, the current code displays "d#" for local set metadevice, "md#" for friendly name local set metadevice, and "#/md#" for remote set metadevices. The names with "md" in them represent direct use of the kstat names. Here are the changes I would like to make: 1. The output should display friendly names when available: The project for svm friendly names [3] did not consider iostat output, so kstat names are currently displayed by '-n'. If a device was created with a friendly name "foo", iostat should display "foo" instead of the kstat name "md#" that is currently displayed. 2. The metadevice output should be consistent local .vs. set: The current code displays "d#" for the local set, and "md#" for shared set. 3. The metaset output should use the set 'name' instead of the set number. The current code displays a set number (like '1') instead of 'setname' (like 'red'). 4. The output should indicate the source of a name: The current output has no indication of the source of the name. Displaying "md" as the source of the name becomes important when we have multiple sources of friendly names (future enhancement associated with [4]). Example: The following shows current and proposed 'iostat -xp' output, in order, for: - local set metadevice - friendly name ("foo") local set metadevice - remote set metadevice. Current: # iostat -xn 0.0 0.0 0.0 0.0 0.0 0.0 0.0 5.9 0 0 d1 0.0 0.0 0.0 0.0 0.0 0.0 0.1 5.0 0 0 md0 7.4 11.2 44.1 214.0 0.0 0.8 0.2 43.9 0 6 1/md10 Proposal: 0.0 0.0 0.0 0.0 0.0 0.0 0.0 5.9 0 0 md/d1 0.0 0.0 0.0 0.0 0.0 0.0 0.1 5.0 0 0 md/foo 7.4 11.3 44.0 215.6 0.0 0.8 0.2 43.7 0 6 md/red/d10 References: [1] iostat(1M) enhancements for device statistics http://sac.sfbay/PSARC/1996/430 added '-n' option [2] libdevinfo devlinks interfaces http://sac.sfbay/PSARC/2000/310 [3] Bunnahabhain: Descriptive Name Support in SVM http://sac.sfbay.sun.com/PSARC/2005/153 [4] File System Driven Device Naming http://sac.sfbay/PSARC/2003/246 [5] Reorganizing and simplifying monitoring commands http://sac.sfbay/PSARC/2004/163