From: Paolo Bonzini <pbonzini@redhat.com>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: kwolf@redhat.com, Jeff Cody <jcody@redhat.com>,
mtosatti@redhat.com, armbru@redhat.com, qemu-devel@nongnu.org,
Federico Simoncelli <fsimonce@redhat.com>,
Luiz Capitulino <lcapitulino@redhat.com>
Subject: Re: [Qemu-devel] drive transactions (was Re: [PATCH 2/2 v2] Add the blockdev-reopen and blockdev-migrate commands)
Date: Mon, 27 Feb 2012 16:03:48 +0100 [thread overview]
Message-ID: <4F4B9B54.7070700@redhat.com> (raw)
In-Reply-To: <4F4B9A46.3090706@codemonkey.ws>
On 02/27/2012 03:59 PM, Anthony Liguori wrote:
> The problem is that the current commands are not designed well. For
> instance, multi-snapshot could look like:
>
> block-freeze ide0-hd0
> block-freeze ide1-hd1
> block-reopen ide0-hd0 my-new-file0.qcow2
> block-reopen ide1-hd1 my-new-file1.qcow2
> block-unfreeze ide1-hd1
> block-unfreeze ide1-hd0
>
> This would work regardless of whether the commands were implemented
> asynchronously within QEMU too.
This looks good, too. Positive: maps well to fsfreeze/thaw with help
from the guest agent. Negative: you have to specify the devices three
times. Overall, I think I like it.
However, you need to add freeze/unfreeze capabilities to the block
layer. Not hard, but one more thing to do.
Paolo
next prev parent reply other threads:[~2012-02-27 15:04 UTC|newest]
Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-22 17:13 [Qemu-devel] Live Block Migration using Mirroring Federico Simoncelli
2012-02-22 17:13 ` [Qemu-devel] [PATCH 1/3] Add blkmirror block driver Federico Simoncelli
2012-02-23 16:14 ` Stefan Hajnoczi
2012-02-23 16:18 ` Stefan Hajnoczi
2012-02-23 16:20 ` Federico Simoncelli
2012-02-23 16:28 ` Stefan Hajnoczi
2012-02-23 16:51 ` Federico Simoncelli
2012-02-23 16:18 ` Federico Simoncelli
2012-02-27 9:23 ` Stefan Hajnoczi
2012-02-27 11:37 ` Paolo Bonzini
2012-02-27 11:42 ` Stefan Hajnoczi
2012-02-27 11:48 ` Paolo Bonzini
2012-02-27 13:09 ` Stefan Hajnoczi
2012-02-27 13:47 ` Paolo Bonzini
2012-02-27 14:49 ` Stefan Hajnoczi
2012-02-27 14:59 ` Stefan Hajnoczi
2012-02-27 15:08 ` Paolo Bonzini
2012-02-22 17:13 ` [Qemu-devel] [PATCH 2/3] Update the " Federico Simoncelli
2012-02-23 7:18 ` Paolo Bonzini
2012-02-23 9:44 ` Federico Simoncelli
2012-02-23 9:45 ` Paolo Bonzini
2012-02-22 17:13 ` [Qemu-devel] [PATCH 3/3] Add nocreate option to snapshot_blkdev Federico Simoncelli
2012-02-23 7:19 ` Paolo Bonzini
2012-02-23 7:38 ` Paolo Bonzini
2012-02-23 9:39 ` Federico Simoncelli
2012-02-23 9:48 ` Paolo Bonzini
2012-02-23 10:19 ` Federico Simoncelli
2012-02-23 11:30 ` Paolo Bonzini
2012-02-23 15:47 ` [Qemu-devel] Live Block Migration using Mirroring Stefan Hajnoczi
2012-02-23 16:10 ` Federico Simoncelli
2012-02-23 16:35 ` Stefan Hajnoczi
2012-02-23 17:06 ` Federico Simoncelli
2012-02-24 11:37 ` [Qemu-devel] [PATCH 1/2] Add blkmirror block driver Federico Simoncelli
2012-02-24 11:37 ` [Qemu-devel] [PATCH 2/2] Add the blockdev-reopen and blockdev-migrate commands Federico Simoncelli
2012-02-24 12:03 ` Kevin Wolf
2012-02-24 12:12 ` Federico Simoncelli
2012-02-24 13:11 ` Paolo Bonzini
2012-02-24 17:04 ` Luiz Capitulino
2012-02-27 14:57 ` Markus Armbruster
2012-02-24 16:49 ` [Qemu-devel] [PATCH 1/2 v2] Add blkmirror block driver Federico Simoncelli
2012-02-24 17:02 ` Eric Blake
2012-02-24 17:15 ` Federico Simoncelli
2012-02-24 18:49 ` Paolo Bonzini
2012-02-24 18:17 ` Luiz Capitulino
2012-02-27 9:17 ` Federico Simoncelli
2012-02-24 16:49 ` [Qemu-devel] [PATCH 2/2 v2] Add the blockdev-reopen and blockdev-migrate commands Federico Simoncelli
2012-02-24 17:46 ` Eric Blake
2012-02-24 18:57 ` Paolo Bonzini
2012-02-24 19:37 ` Eric Blake
2012-02-24 19:01 ` Luiz Capitulino
2012-02-24 19:40 ` Eric Blake
2012-02-24 20:26 ` Luiz Capitulino
2012-02-24 22:46 ` Eric Blake
2012-02-24 20:32 ` Paolo Bonzini
2012-02-24 20:36 ` Luiz Capitulino
2012-02-24 21:05 ` Paolo Bonzini
2012-02-24 22:30 ` Eric Blake
2012-02-25 6:47 ` Paolo Bonzini
2012-02-27 11:29 ` Federico Simoncelli
2012-02-27 12:12 ` Luiz Capitulino
2012-02-27 12:49 ` Paolo Bonzini
2012-02-27 13:06 ` Luiz Capitulino
2012-02-27 14:39 ` [Qemu-devel] drive transactions (was Re: [PATCH 2/2 v2] Add the blockdev-reopen and blockdev-migrate commands) Paolo Bonzini
2012-02-27 14:46 ` Anthony Liguori
2012-02-27 14:54 ` Paolo Bonzini
2012-02-27 14:59 ` Anthony Liguori
2012-02-27 15:03 ` Paolo Bonzini [this message]
2012-02-27 15:06 ` Anthony Liguori
2012-02-27 15:17 ` Kevin Wolf
2012-02-27 15:24 ` Anthony Liguori
2012-02-27 16:51 ` Paolo Bonzini
2012-02-27 16:58 ` Anthony Liguori
2012-02-27 17:06 ` Paolo Bonzini
2012-02-27 16:33 ` Federico Simoncelli
2012-02-27 16:41 ` Paolo Bonzini
2012-02-27 16:42 ` Anthony Liguori
2012-02-27 16:50 ` Federico Simoncelli
2012-02-27 16:53 ` Anthony Liguori
2012-02-27 16:54 ` Paolo Bonzini
2012-02-27 16:59 ` Anthony Liguori
2012-02-27 17:37 ` Luiz Capitulino
2012-02-28 15:47 ` [Qemu-devel] Live Block Migration using Mirroring Stefan Hajnoczi
2012-02-28 17:15 ` Federico Simoncelli
2012-02-28 17:36 ` Paolo Bonzini
2012-02-28 17:46 ` Federico Simoncelli
2012-02-28 18:02 ` Paolo Bonzini
2012-02-28 18:21 ` Federico Simoncelli
2012-02-28 17:26 ` Paolo Bonzini
2012-02-29 12:28 ` [Qemu-devel] [PATCHv3] Add blkmirror block driver Federico Simoncelli
2012-02-29 13:02 ` Federico Simoncelli
2012-02-29 17:01 ` [Qemu-devel] [PATCHv4] " Federico Simoncelli
2012-03-05 16:59 ` [Qemu-devel] Live Block Migration using Mirroring Marcelo Tosatti
2012-03-05 17:20 ` Eric Blake
2012-03-05 17:44 ` Marcelo Tosatti
2012-03-05 18:05 ` Paolo Bonzini
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