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Date: Fri, 19 Sep 2008 15:55:04 -0700
From: Artem Kachitchkine <Artem.Kachitchkin@sun.com>
Subject: PSARC/2008/596 Block Tap Support for Solaris
Sender: Artem.Kachitchkin@sun.com
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I'm sponsoring this fasttrack for Mark Johnson. The timer is set for 09/26/2008.

-Artem

Template Version: @(#)sac_nextcase %I% %G% SMI
This information is Copyright 2008 Sun Microsystems
1. Introduction
     1.1. Project/Component Working Name:
	 Block Tap Support for Solaris
     1.2. Name of Document Author/Supplier:
	 Author:  Mark Johnson
     1.3  Date of This Document:
	19 September, 2008
4. Technical Description

4.1.  Summary

This fasttrack delivers a new virtual disk backend driver for Solaris
which is capable of reading & writing VMWare native (vmdk), VirtualBox
native (vdi), and raw disk files. See the sister vdiskadm fasttrack for
information on how to create and manage these file based virtual disks.

Minor release binding is requested.


4.2.  Discussion

On Solaris, a para-virtualized disk is implemented with a frontend
block driver (which lives in the guest OS) and a backend block driver
(which lives in the IO domain). The backend driver performs the actual
disk I/O on behalf of the guest OS.

This case adds an additional backend driver to handle additional file
based disks. This includes support for VMWare native (vmdk), VirtualBox
native (vdi), and raw disk files. COW based snapshot support is
included for both vmdk and vdi based files. This driver will be the
default backend driver for file based disks going forward.

The actual block tap driver is split into two parts. A kernel driver
(xpvtap) and a user space application (vdisk). xpvtap will receive
block requests from the guest OS, map in the guest pages into the vdisk
application's address space, and then forward the request to the vdisk
application using a standard Xen blkif ring. The vdisk application will
perform the block operation on the file based virtual disk, and then
send the response back down to the xpvtap driver. The xpvtap driver
will then forward the response on to the guest.

The vdisk application runs as user xvm and runs with the
PRIV_XVM_CONTROL privilege. The xpvtap driver requires this privilege
to perform and ioctl or mmap operations. See PSARC/2008/289 for further
information on PRIV_XVM_CONTROL.

A hot plug script (tap-event), which fits into the existing i86xpv PV
driver hotplug infrastructure, takes care of start & stopping the vdisk
application, and synchronizing the application startup with the driver
instance.

The current backend block driver (xdb) allows block devices or raw
files (using lofi) to be exported to the guest as disks. xdb will
continue to be present and will co-exist with the block tap driver
(xpvtap). A guest may contain many disks. These disks can be a mixture
of block devices using xdb, raw files using xdb, and vmdk, vdi, and/or
raw files using xpvtap.

For illustration purposes of what exists today with xdb, either of the
following commands would add a raw file based disk ("file") to a guest
using the existing xdb backend driver.

  # xm block-attach nevada file:/tank/guests/nevada/disk.raw 3 w
  # virsh attach-disk nevada /tank/guests/nevada/disk.raw 3 --driver file

And either of the following commands would add a block based disk
("phy") to a guest using the existing xdb backend driver.

  # xm block-attach nevada phy:/dev/zvol/dsk/tank/guests/scratch 3 w
  # virsh attach-disk nevada /dev/zvol/dsk/tank/guests/scratch 3 --driver phy

For block tap, the "tap:vdisk" syntax is used to add a block tap file
based virtual disk. The same syntax is used for all formats (vmdk, vdi,
raw).

  # xm block-attach nevada tap:vdisk:/tank/guests/nevada/disk 3 w
  # virsh attach-disk nevada /tank/guests/nevada/disk hdb --driver tap 
--subdriver vdisk


4.3.  Interfaces

The extension to select the block tap driver (tap:vdisk) is
Uncommitted (consistent with the current file: and phy: tags).

The vdisk command line options and output are Project Private.
The only consumer of these interfaces are the tap-event script.

The tap-event script command line options and output are
Project Private.

Interfaces between the xpvtap driver and vdisk application
are Project Private.


5.  References

PSARC/2006/260 Solaris on Xen
PSARC/2007/157 libvirt - a LGPL library to control guest domain
PSARC/2008/289 Least Privilege for xVM

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 carlsonj@phorcys.east.sun.com Mon Sep 22 04:10:42 2008
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Date: Mon, 22 Sep 2008 07:10:35 -0400
From: James Carlson <james.d.carlson@sun.com>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
In-reply-to: <48D42DC8.50100@sun.com>
To: Artem Kachitchkine <Artem.Kachitchkin@sun.com>
Cc: PSARC-ext@sun.com, Mark.Johnson@sun.com, Susan.Kamm-Worrell@sun.com
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Artem Kachitchkine writes:
> This fasttrack delivers a new virtual disk backend driver for Solaris
> which is capable of reading & writing VMWare native (vmdk), VirtualBox
> native (vdi), and raw disk files. See the sister vdiskadm fasttrack for
> information on how to create and manage these file based virtual disks.

Does this project depend on 'vdiskadm'?  Does that other project
depend on this one?

I'd much rather see the whole project described in a single ARC case,
if that's at all possible.

> 4.3.  Interfaces

What about the VMWare native and Virtual Box native disk file formats?

-- 
James Carlson, Solaris Networking              <james.d.carlson@sun.com>
Sun Microsystems / 35 Network Drive        71.232W   Vox +1 781 442 2084
MS UBUR02-212 / Burlington MA 01803-2757   42.496N   Fax +1 781 442 1677

From Mark.Johnson@sun.com Mon Sep 22 07:17:19 2008
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Date: Mon, 22 Sep 2008 10:17:08 -0400
From: Mark Johnson <Mark.Johnson@sun.com>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
In-reply-to: <18647.32043.268917.823051@gargle.gargle.HOWL>
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To: James Carlson <James.D.Carlson@sun.com>
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James Carlson wrote:
> Artem Kachitchkine writes:
>> This fasttrack delivers a new virtual disk backend driver for Solaris
>> which is capable of reading & writing VMWare native (vmdk), VirtualBox
>> native (vdi), and raw disk files. See the sister vdiskadm fasttrack for
>> information on how to create and manage these file based virtual disks.
> 
> Does this project depend on 'vdiskadm'?  Does that other project
> depend on this one?

blktap does have a dependency on vdiskadm, but can
operate without it. blktap is specific to Xen.

vdiskadm does not have any dependencies on blktap or
xVM. It can be leveraged by other efforts (as blktap
did). There aren't any other projects leveraging
vdiskadm today.



> I'd much rather see the whole project described in a single ARC case,
> if that's at all possible.

If you feel strongly about it, we can do that... What
would be the next step for us?



>> 4.3.  Interfaces
> 
> What about the VMWare native and Virtual Box native disk file formats?

Yes, I will add this in.  I'll wait to hear back about the merge
before sending out an update.



Thanks,

MRJ



From gdamore@sun.com Mon Sep 22 07:29:20 2008
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Date: Mon, 22 Sep 2008 07:27:14 -0700
From: "Garrett D'Amore" <gdamore@sun.com>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
In-reply-to: <48D7A8E4.1090507@sun.com>
Sender: Garrett.Damore@sun.com
To: Mark Johnson <Mark.Johnson@sun.com>
Cc: James Carlson <James.D.Carlson@sun.com>,
        Artem Kachitchkine <Artem.Kachitchkin@sun.com>, PSARC-ext@sun.com,
        Susan.Kamm-Worrell@sun.com
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Mark Johnson wrote:
>
>
> James Carlson wrote:
>> Artem Kachitchkine writes:
>>> This fasttrack delivers a new virtual disk backend driver for Solaris
>>> which is capable of reading & writing VMWare native (vmdk), VirtualBox
>>> native (vdi), and raw disk files. See the sister vdiskadm fasttrack for
>>> information on how to create and manage these file based virtual disks.
>>
>> Does this project depend on 'vdiskadm'?  Does that other project
>> depend on this one?
>
> blktap does have a dependency on vdiskadm, but can
> operate without it. blktap is specific to Xen.
>
> vdiskadm does not have any dependencies on blktap or
> xVM. It can be leveraged by other efforts (as blktap
> did). There aren't any other projects leveraging
> vdiskadm today.
>
>
>
>> I'd much rather see the whole project described in a single ARC case,
>> if that's at all possible.
>
> If you feel strongly about it, we can do that... What
> would be the next step for us?
>
>
>
>>> 4.3.  Interfaces
>>
>> What about the VMWare native and Virtual Box native disk file formats?
>
> Yes, I will add this in.  I'll wait to hear back about the merge
> before sending out an update.

Based on your above comments re project dependencies, it does sound like 
separate ARC cases was the right way to go.  Jim may of course feel 
differently.

    -- Garrett
>
>
>
> Thanks,
>
> MRJ
>
>


From carlsonj@phorcys.east.sun.com Mon Sep 22 07:53:04 2008
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Date: Mon, 22 Sep 2008 10:52:52 -0400
From: James Carlson <james.d.carlson@sun.com>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
In-reply-to: <48D7A8E4.1090507@sun.com>
To: Mark Johnson <Mark.Johnson@sun.com>
Cc: PSARC-ext@sun.com, Artem Kachitchkine <Artem.Kachitchkin@sun.com>,
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Mark Johnson writes:
> James Carlson wrote:
> > Artem Kachitchkine writes:
> >> This fasttrack delivers a new virtual disk backend driver for Solaris
> >> which is capable of reading & writing VMWare native (vmdk), VirtualBox
> >> native (vdi), and raw disk files. See the sister vdiskadm fasttrack for
> >> information on how to create and manage these file based virtual disks.
> > 
> > Does this project depend on 'vdiskadm'?  Does that other project
> > depend on this one?
> 
> blktap does have a dependency on vdiskadm, but can
> operate without it. blktap is specific to Xen.
> 
> vdiskadm does not have any dependencies on blktap or
> xVM. It can be leveraged by other efforts (as blktap
> did). There aren't any other projects leveraging
> vdiskadm today.

Would vdiskadm be a useful addition to the system if blktap never
integrates?  (What would it do?)

> > I'd much rather see the whole project described in a single ARC case,
> > if that's at all possible.
> 
> If you feel strongly about it, we can do that... What
> would be the next step for us?

No, I don't feel strongly about it.  I just think it's less confusing
to see one case that sets out the whole project than a series of tiny
interconnected cases that are intended to be worked together.

> >> 4.3.  Interfaces
> > 
> > What about the VMWare native and Virtual Box native disk file formats?
> 
> Yes, I will add this in.  I'll wait to hear back about the merge
> before sending out an update.

OK.  I'm mostly curious about the stability level of those formats.

-- 
James Carlson, Solaris Networking              <james.d.carlson@sun.com>
Sun Microsystems / 35 Network Drive        71.232W   Vox +1 781 442 2084
MS UBUR02-212 / Burlington MA 01803-2757   42.496N   Fax +1 781 442 1677

From Mark.Johnson@sun.com Mon Sep 22 09:46:52 2008
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Date: Mon, 22 Sep 2008 12:46:38 -0400
From: Mark Johnson <Mark.Johnson@sun.com>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
In-reply-to: <18647.45380.271924.415989@gargle.gargle.HOWL>
Sender: Mark.Johnson@sun.com
To: James Carlson <James.D.Carlson@sun.com>
Cc: PSARC-ext@sun.com, Artem Kachitchkine <Artem.Kachitchkin@sun.com>,
        Susan.Kamm-Worrell@sun.com
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James Carlson wrote:
> Mark Johnson writes:
>> James Carlson wrote:
>>> Artem Kachitchkine writes:
>>>> This fasttrack delivers a new virtual disk backend driver for Solaris
>>>> which is capable of reading & writing VMWare native (vmdk), VirtualBox
>>>> native (vdi), and raw disk files. See the sister vdiskadm fasttrack for
>>>> information on how to create and manage these file based virtual disks.
>>> Does this project depend on 'vdiskadm'?  Does that other project
>>> depend on this one?
>> blktap does have a dependency on vdiskadm, but can
>> operate without it. blktap is specific to Xen.
>>
>> vdiskadm does not have any dependencies on blktap or
>> xVM. It can be leveraged by other efforts (as blktap
>> did). There aren't any other projects leveraging
>> vdiskadm today.
> 
> Would vdiskadm be a useful addition to the system if blktap never
> integrates?  (What would it do?)

By itself, vdiskadm wouldn't be overly useful today.
You would be able to create/snapshot vmdk and vdi files.
But nothing would write to them.

In the near future, you will be able to convert a vmdk or
vdi files to a zvol, or zvol to vmdk or vdi file..
That would be useful outside of blktap. But that is
*not* covered by this fast track.

Having them separate is based on forward look assumptions
that it will be used by other code outside of xVM-Xen.
I can see how assumptions like that can get out of hand too..



>>> I'd much rather see the whole project described in a single ARC case,
>>> if that's at all possible.
>> If you feel strongly about it, we can do that... What
>> would be the next step for us?
> 
> No, I don't feel strongly about it.  I just think it's less confusing
> to see one case that sets out the whole project than a series of tiny
> interconnected cases that are intended to be worked together.

We can certainly see that point.. We don't have any issues
with combining the two cases if asked to. We would just need
a little guidance on what we would need to do to move forward
with that.


>>>> 4.3.  Interfaces
>>> What about the VMWare native and Virtual Box native disk file formats?
>> Yes, I will add this in.  I'll wait to hear back about the merge
>> before sending out an update.
> 
> OK.  I'm mostly curious about the stability level of those formats.

vmdk and vdi file formats are Uncommitted.



Thanks,


MRJ


From carlsonj@phorcys.east.sun.com Mon Sep 22 10:02:45 2008
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Date: Mon, 22 Sep 2008 13:02:37 -0400
From: James Carlson <james.d.carlson@sun.com>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
In-reply-to: <48D7CBEE.7060100@sun.com>
To: Mark Johnson <Mark.Johnson@sun.com>
Cc: PSARC-ext@sun.com, Artem Kachitchkine <Artem.Kachitchkin@sun.com>,
        Susan.Kamm-Worrell@sun.com
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Mark Johnson writes:
> James Carlson wrote:
> > Would vdiskadm be a useful addition to the system if blktap never
> > integrates?  (What would it do?)
> 
> By itself, vdiskadm wouldn't be overly useful today.
> You would be able to create/snapshot vmdk and vdi files.
> But nothing would write to them.

That makes it sound like vdiskadm is actually dependent on delivery of
blktap.

> In the near future, you will be able to convert a vmdk or
> vdi files to a zvol, or zvol to vmdk or vdi file..
> That would be useful outside of blktap. But that is
> *not* covered by this fast track.
> 
> Having them separate is based on forward look assumptions
> that it will be used by other code outside of xVM-Xen.
> I can see how assumptions like that can get out of hand too..

Yes; it makes it a little less clear what we're actually approving.  :-/

> We can certainly see that point.. We don't have any issues
> with combining the two cases if asked to. We would just need
> a little guidance on what we would need to do to move forward
> with that.

I can live with it the way it is, as long as these two are the whole
project as it stands today.  (Otherwise, I'd want to see something
that documents the whole project.)

> >>>> 4.3.  Interfaces
> >>> What about the VMWare native and Virtual Box native disk file formats?
> >> Yes, I will add this in.  I'll wait to hear back about the merge
> >> before sending out an update.
> > 
> > OK.  I'm mostly curious about the stability level of those formats.
> 
> vmdk and vdi file formats are Uncommitted.

How does this versioning work?

How do the Virtual Box people know to work with us if they need to
create a new disk image format?  Do we know or constrain their plans?

If VMWare chooses to create a new file format (perhaps just to spite
Sun and xVM), does something here have to track the changes?

-- 
James Carlson, Solaris Networking              <james.d.carlson@sun.com>
Sun Microsystems / 35 Network Drive        71.232W   Vox +1 781 442 2084
MS UBUR02-212 / Burlington MA 01803-2757   42.496N   Fax +1 781 442 1677

From Mark.Johnson@Sun.COM Mon Sep 22 10:41:25 2008
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Date: Mon, 22 Sep 2008 13:41:19 -0400
From: Mark Johnson <Mark.Johnson@Sun.COM>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
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Cc: PSARC-ext@Sun.COM, Artem Kachitchkine <Artem.Kachitchkin@Sun.COM>,
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James Carlson wrote:
> Mark Johnson writes:
>> James Carlson wrote:
>>> Would vdiskadm be a useful addition to the system if blktap never
>>> integrates?  (What would it do?)
>> By itself, vdiskadm wouldn't be overly useful today.
>> You would be able to create/snapshot vmdk and vdi files.
>> But nothing would write to them.
> 
> That makes it sound like vdiskadm is actually dependent on delivery of
> blktap.
> 
>> In the near future, you will be able to convert a vmdk or
>> vdi files to a zvol, or zvol to vmdk or vdi file..
>> That would be useful outside of blktap. But that is
>> *not* covered by this fast track.
>>
>> Having them separate is based on forward look assumptions
>> that it will be used by other code outside of xVM-Xen.
>> I can see how assumptions like that can get out of hand too..
> 
> Yes; it makes it a little less clear what we're actually approving.  :-/
> 
>> We can certainly see that point.. We don't have any issues
>> with combining the two cases if asked to. We would just need
>> a little guidance on what we would need to do to move forward
>> with that.
> 
> I can live with it the way it is, as long as these two are the whole
> project as it stands today.  (Otherwise, I'd want to see something
> that documents the whole project.)

Yes, these two fasttracks encompass the entire effort.



>>>>>> 4.3.  Interfaces
>>>>> What about the VMWare native and Virtual Box native disk file formats?
>>>> Yes, I will add this in.  I'll wait to hear back about the merge
>>>> before sending out an update.
>>> OK.  I'm mostly curious about the stability level of those formats.
>> vmdk and vdi file formats are Uncommitted.
> 
> How does this versioning work?

vmdk support follows the vmdk spec (Virtual Disk Format
1.0). There is a version field in the vmdk header.

vdi is also versioned, but I can't get to my workspace
to provide the actual details at the moment.


> How do the Virtual Box people know to work with us if they need to
> create a new disk image format?  Do we know or constrain their plans?

Yes, we are talking with them. We use the actual
VirtualBox disk code to provide this support.
Their code is very modular so it's relatively
easy to keep in sync with their changes. Even if
they add entirely new disk formats.

We do not constrain them in any way.



> If VMWare chooses to create a new file format (perhaps just to spite
> Sun and xVM), does something here have to track the changes?

We are committing to what VMWare has documented in the
1.0 version of their spec. Any support for future
version updates to their spec are to be determined.



Thanks,

MRJ



From carlsonj@phorcys.east.sun.com Mon Sep 22 10:44:50 2008
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Date: Mon, 22 Sep 2008 13:44:46 -0400
From: James Carlson <James.D.Carlson@sun.com>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
In-reply-to: <48D7D8BF.3020801@sun.com>
To: Mark Johnson <Mark.Johnson@sun.com>
Cc: PSARC-ext@sun.com, Artem Kachitchkine <Artem.Kachitchkin@sun.com>,
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Mark Johnson writes:
> > How do the Virtual Box people know to work with us if they need to
> > create a new disk image format?  Do we know or constrain their plans?
> 
> Yes, we are talking with them. We use the actual
> VirtualBox disk code to provide this support.
> Their code is very modular so it's relatively
> easy to keep in sync with their changes. Even if
> they add entirely new disk formats.
> 
> We do not constrain them in any way.
> 
> 
> 
> > If VMWare chooses to create a new file format (perhaps just to spite
> > Sun and xVM), does something here have to track the changes?
> 
> We are committing to what VMWare has documented in the
> 1.0 version of their spec. Any support for future
> version updates to their spec are to be determined.

OK; thanks.  That answers the questions I had.

-- 
James Carlson, Solaris Networking              <james.d.carlson@sun.com>
Sun Microsystems / 35 Network Drive        71.232W   Vox +1 781 442 2084
MS UBUR02-212 / Burlington MA 01803-2757   42.496N   Fax +1 781 442 1677

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Date: Tue, 23 Sep 2008 17:02:29 +0100
From: Darren J Moffat <Darren.Moffat@sun.com>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
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To: Artem Kachitchkine <Artem.Kachitchkin@sun.com>
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I need time to review this case but I may not be able to do so by the 
timeout on Wednesday, so please consider this a request for more time.

In particular I want to review where this is taking us compared to lofi 
given that lofi has compression and encryption support, what what that 
means for the architecture of this case.


--
Darren J Moffat

From Artem.Kachitchkin@sun.com Tue Sep 23 09:50:52 2008
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Date: Tue, 23 Sep 2008 09:50:14 -0700
From: Artem Kachitchkine <Artem.Kachitchkin@sun.com>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
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Darren J Moffat wrote:
> I need time to review this case but I may not be able to do so by the 
> timeout on Wednesday, so please consider this a request for more time.

Correction: the timeout is on Friday, 9/26. Given that, do you still 
need more time?

-Artem

From Darren.Moffat@sun.com Tue Sep 23 10:18:23 2008
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Date: Tue, 23 Sep 2008 18:18:19 +0100
From: Darren J Moffat <Darren.Moffat@sun.com>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
In-reply-to: <48D91E46.1030107@sun.com>
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Artem Kachitchkine wrote:
> Darren J Moffat wrote:
>> I need time to review this case but I may not be able to do so by the 
>> timeout on Wednesday, so please consider this a request for more time.
> 
> Correction: the timeout is on Friday, 9/26. Given that, do you still 
> need more time?

Probably will since I'm at SNIA and SISW conferences this week.  I'll 
try and review today but if I don't managed to I won't be able to do sun 
until Monday 29th.

-- 
Darren J Moffat

From Darren.Moffat@Sun.COM Tue Sep 23 22:24:40 2008
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Date: Wed, 24 Sep 2008 06:24:36 +0100
From: Darren J Moffat <Darren.Moffat@Sun.COM>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
In-reply-to: <48D42DC8.50100@sun.com>
Sender: Darren.Moffat@Sun.COM
To: Artem Kachitchkine <Artem.Kachitchkin@Sun.COM>
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Artem Kachitchkine wrote:
> The current backend block driver (xdb) allows block devices or raw
> files (using lofi) to be exported to the guest as disks. xdb will
> continue to be present and will co-exist with the block tap driver
> (xpvtap). A guest may contain many disks. These disks can be a mixture
> of block devices using xdb, raw files using xdb, and vmdk, vdi, and/or
> raw files using xpvtap.

Why keep the existing lofi based with xdb as the default for file based 
disks if xpvtab can support this too ?
Is it just because lofi supports compression and encryption and xpvtap 
doesn't or is there another reason ? This is the only part that needs to 
be answered for me to be happy with the architecture of this case the 
rest is futures.

Is xdb likely to be obsoleted in the future ?

I believe VMware has the capability to provide encrypted .vmdk images, 
is there a plan/desire for this support to be added to xpvtap in the 
future I'm not expecting it to be part of this case just trying to work 
of if  the architecture of this case can support it, I believe it could 
providing we can get the details of how encrypted vmdk images are written.

I would expect that to support encryption with xpvtab vdiskadm 
(PSARC/2008/597) would need updating.

For VirtualBox VDI format there is an open request for adding encryption 
support: http://www.virtualbox.org/ticket/1765

Similar comments for compression.

--
Darren J Moffat



From Mark.Johnson@Sun.COM Wed Sep 24 05:36:03 2008
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Date: Wed, 24 Sep 2008 08:35:42 -0400
From: Mark Johnson <Mark.Johnson@Sun.COM>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
In-reply-to: <48D9CF14.8050702@Sun.COM>
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        Susan.Kamm-Worrell@Sun.COM
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Darren J Moffat wrote:
> Artem Kachitchkine wrote:
>> The current backend block driver (xdb) allows block devices or raw
>> files (using lofi) to be exported to the guest as disks. xdb will
>> continue to be present and will co-exist with the block tap driver
>> (xpvtap). A guest may contain many disks. These disks can be a mixture
>> of block devices using xdb, raw files using xdb, and vmdk, vdi, and/or
>> raw files using xpvtap.
> 
> Why keep the existing lofi based with xdb as the default for file based 
> disks if xpvtab can support this too ?
> Is it just because lofi supports compression and encryption and xpvtap 
> doesn't or is there another reason ? This is the only part that needs to 
> be answered for me to be happy with the architecture of this case the 
> rest is futures.

xdb with lofi is still used for cdrom emulation. xpvtap
does not handle media exchange today.

There is a recent RFE to add in this support to xpvtap
in the future. When this, encryption, and possibly
compression support are present in xpvtap, it makes
sense to re-evaluate lofi support in xdb.


> Is xdb likely to be obsoleted in the future ?

It's expected that xdb will still be used for block
based devices (zvols, raw disks, etc).



> I believe VMware has the capability to provide encrypted .vmdk images, 
> is there a plan/desire for this support to be added to xpvtap in the 
> future I'm not expecting it to be part of this case just trying to work 
> of if  the architecture of this case can support it, I believe it could 
> providing we can get the details of how encrypted vmdk images are written.

Assuming VMWare provides the details for the encrypted .vmdk
image, and customers use it, I would expect us to add support
for it.



> I would expect that to support encryption with xpvtab vdiskadm 
> (PSARC/2008/597) would need updating.

Yes.


> For VirtualBox VDI format there is an open request for adding encryption 
> support: http://www.virtualbox.org/ticket/1765

Yes, we are aware and interested in this. :-)



> Similar comments for compression.

We haven't discussed compression internally yet.
But all the same comments apply.  Once the 1.0
features have been putback, we are going to start
prioritizing what functionality to add next. Most,
if not all of which, will require follow-up ARC work.



Thanks,


MRJ



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Date: Wed, 24 Sep 2008 18:54:34 +0100
From: Darren J Moffat <Darren.Moffat@sun.com>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
In-reply-to: <48DA341E.1040400@sun.com>
Sender: Darren.Moffat@sun.com
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I'm happy with the responses and support the case as specified.

--
Darren J Moffat

From gdamore@sun.com Wed Sep 24 11:06:39 2008
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Date: Wed, 24 Sep 2008 11:04:24 -0700
From: "Garrett D'Amore" <gdamore@sun.com>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
In-reply-to: <48DA7EDA.4090602@Sun.COM>
Sender: Garrett.Damore@sun.com
To: Darren J Moffat <Darren.Moffat@sun.com>
Cc: Mark Johnson <Mark.Johnson@sun.com>,
        Artem Kachitchkine <Artem.Kachitchkin@sun.com>, PSARC-ext@sun.com,
        Susan.Kamm-Worrell@sun.com
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Darren J Moffat wrote:
> I'm happy with the responses and support the case as specified.
>
> -- 
> Darren J Moffat
Its too bad you weren't at todays meeting then -- the case was extended 
to cover your concerns.  Can we get a quorum via e-mail to approve the 
case ahead of timeout (I'm not sure there is precedent for this).  Is 
the project team OK with waiting another week for approval?  (It 
certainly appears that the project will be approved as specified.)

    - Garrett

From Mark.Johnson@sun.com Wed Sep 24 11:14:21 2008
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Date: Wed, 24 Sep 2008 14:14:02 -0400
From: Mark Johnson <Mark.Johnson@sun.com>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
In-reply-to: <48DA8128.9080007@sun.com>
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To: "Garrett D'Amore" <gdamore@sun.com>
Cc: Darren J Moffat <Darren.Moffat@sun.com>,
        Artem Kachitchkine <Artem.Kachitchkin@sun.com>, PSARC-ext@sun.com,
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Garrett D'Amore wrote:
> Darren J Moffat wrote:
>> I'm happy with the responses and support the case as specified.
>>
>> -- 
>> Darren J Moffat
> Its too bad you weren't at todays meeting then -- the case was extended 
> to cover your concerns.  Can we get a quorum via e-mail to approve the 
> case ahead of timeout (I'm not sure there is precedent for this).  Is 
> the project team OK with waiting another week for approval?  (It 
> certainly appears that the project will be approved as specified.)

We are targeting b100 so the original timeout on
Friday would be better for us. :-)

I had asked at the meeting, that if Darren was OK with
the responses, if it was OK to leave the timer on
Friday.. I thought folks agreed to that, but I
didn't see it in the status.



Thanks,

MRJ


From carlsonj@phorcys.east.sun.com Wed Sep 24 11:18:05 2008
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Date: Wed, 24 Sep 2008 14:17:59 -0400
From: James Carlson <james.d.carlson@sun.com>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
In-reply-to: <48DA8128.9080007@sun.com>
To: "Garrett D'Amore" <gdamore@sun.com>
Cc: Darren J Moffat <Darren.Moffat@sun.com>, PSARC-ext@sun.com,
        Artem Kachitchkine <Artem.Kachitchkin@sun.com>,
        Mark Johnson <Mark.Johnson@sun.com>, Susan.Kamm-Worrell@sun.com
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Garrett D'Amore writes:
> Darren J Moffat wrote:
> > I'm happy with the responses and support the case as specified.
> >
> > -- 
> > Darren J Moffat
> Its too bad you weren't at todays meeting then -- the case was extended 
> to cover your concerns.  Can we get a quorum via e-mail to approve the 
> case ahead of timeout (I'm not sure there is precedent for this).  Is 
> the project team OK with waiting another week for approval?  (It 
> certainly appears that the project will be approved as specified.)

This fast-track request was submitted less than 24 hours before the
start of the meeting.  I thought we had an informal rule stating that
fast-tracks had to run at least that long to allow everyone to read
them.

-- 
James Carlson, Solaris Networking              <james.d.carlson@sun.com>
Sun Microsystems / 35 Network Drive        71.232W   Vox +1 781 442 2084
MS UBUR02-212 / Burlington MA 01803-2757   42.496N   Fax +1 781 442 1677

From gdamore@sun.com Wed Sep 24 11:25:24 2008
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Date: Wed, 24 Sep 2008 11:22:58 -0700
From: "Garrett D'Amore" <gdamore@sun.com>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
In-reply-to: <48DA836A.7080603@sun.com>
Sender: Garrett.Damore@sun.com
To: Mark Johnson <Mark.Johnson@sun.com>
Cc: Darren J Moffat <Darren.Moffat@sun.com>,
        Artem Kachitchkine <Artem.Kachitchkin@sun.com>, PSARC-ext@sun.com,
        Susan.Kamm-Worrell@sun.com
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Mark Johnson wrote:
>
>
> Garrett D'Amore wrote:
>> Darren J Moffat wrote:
>>> I'm happy with the responses and support the case as specified.
>>>
>>> -- 
>>> Darren J Moffat
>> Its too bad you weren't at todays meeting then -- the case was 
>> extended to cover your concerns.  Can we get a quorum via e-mail to 
>> approve the case ahead of timeout (I'm not sure there is precedent 
>> for this).  Is the project team OK with waiting another week for 
>> approval?  (It certainly appears that the project will be approved as 
>> specified.)
>
> We are targeting b100 so the original timeout on
> Friday would be better for us. :-)
>
> I had asked at the meeting, that if Darren was OK with
> the responses, if it was OK to leave the timer on
> Friday.. I thought folks agreed to that, but I
> didn't see it in the status.

Hmm... maybe it was let run, not extended?  Letting it run to Friday 
certainly seems fair enough to me.

As a general rule of thumb, it would be better next time to submit the 
fast track a build or two *ahead* of your needed integration date.  
While fast tracks often take less than a week to complete, they 
occasionally need to run for another week or two, and submission of case 
materials early reduces the likelihood of running into ARC-incurred delays.

(Never mind the fact that I am certain that the gatekeepers would rather 
avoid the crowding of projects that seems to happen in the final builds 
before a release.  In my estimation, the amount of new code that seems 
to be targeting b100 is a bit disconcerting.)

    -- Garrett
>
>
>
> Thanks,
>
> MRJ
>


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Date: Wed, 24 Sep 2008 14:33:40 -0400
From: James Carlson <james.d.carlson@sun.com>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
In-reply-to: <18650.33879.243364.969924@gargle.gargle.HOWL>
To: "Garrett D'Amore" <gdamore@sun.com>,
        Darren J Moffat <Darren.Moffat@sun.com>, PSARC-ext@sun.com,
        Artem Kachitchkine <Artem.Kachitchkin@sun.com>,
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James Carlson writes:
> This fast-track request was submitted less than 24 hours before the
> start of the meeting.  I thought we had an informal rule stating that
> fast-tracks had to run at least that long to allow everyone to read
> them.

Shoot.  Sorry; I got this response mixed up with 2008/580.  "Never
mind."

-- 
James Carlson, Solaris Networking              <james.d.carlson@sun.com>
Sun Microsystems / 35 Network Drive        71.232W   Vox +1 781 442 2084
MS UBUR02-212 / Burlington MA 01803-2757   42.496N   Fax +1 781 442 1677

From Mark.Johnson@sun.com Wed Sep 24 11:38:13 2008
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Date: Wed, 24 Sep 2008 14:37:54 -0400
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 <48DA8128.9080007@sun.com> <48DA836A.7080603@sun.com>
 <48DA8582.2040900@sun.com>
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Garrett D'Amore wrote:
> Mark Johnson wrote:
>>
>>
>> Garrett D'Amore wrote:
>>> Darren J Moffat wrote:
>>>> I'm happy with the responses and support the case as specified.
>>>>
>>>> -- 
>>>> Darren J Moffat
>>> Its too bad you weren't at todays meeting then -- the case was 
>>> extended to cover your concerns.  Can we get a quorum via e-mail to 
>>> approve the case ahead of timeout (I'm not sure there is precedent 
>>> for this).  Is the project team OK with waiting another week for 
>>> approval?  (It certainly appears that the project will be approved as 
>>> specified.)
>>
>> We are targeting b100 so the original timeout on
>> Friday would be better for us. :-)
>>
>> I had asked at the meeting, that if Darren was OK with
>> the responses, if it was OK to leave the timer on
>> Friday.. I thought folks agreed to that, but I
>> didn't see it in the status.
> 
> Hmm... maybe it was let run, not extended?  Letting it run to Friday 
> certainly seems fair enough to me.
> 
> As a general rule of thumb, it would be better next time to submit the 
> fast track a build or two *ahead* of your needed integration date.  
> While fast tracks often take less than a week to complete, they 
> occasionally need to run for another week or two, and submission of case 
> materials early reduces the likelihood of running into ARC-incurred delays.

I understand and agree..



MRJ


> (Never mind the fact that I am certain that the gatekeepers would rather 
> avoid the crowding of projects that seems to happen in the final builds 
> before a release.  In my estimation, the amount of new code that seems 
> to be targeting b100 is a bit disconcerting.)
> 
>    -- Garrett
>>
>>
>>
>> Thanks,
>>
>> MRJ
>>
> 

From Artem.Kachitchkin@sun.com Fri Sep 26 12:39:38 2008
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Date: Fri, 26 Sep 2008 12:40:03 -0700
From: Artem Kachitchkine <Artem.Kachitchkin@sun.com>
Subject: Re: PSARC/2008/596 Block Tap Support for Solaris
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I believe all issues have been addressed, so I'm marking this case 
closed approved.

-Artem

