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Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu
From: |
Dietmar Maurer |
Subject: |
Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu |
Date: |
Wed, 20 Feb 2013 16:04:49 +0000 |
> Interesting series, the backup block job makes sense to me. Regarding
> efficiency, I think incremental backup is a must, otherwise regular backups
> using this approach won't really be a win over backing files.
Incremental backup is something different, not touched by this code.
You can add that later if needed.
> The backup writer abstraction is a special case interface somewhere
> between an image format and live migration. I'd prefer it if the backup
> block job stuck to BlockDriverState as the destination for backup data.
> Then you could save a point-in-time copy of a disk to a raw or even
> qcow2 image.
backup needs to work on non-seekable pipes.
> The vmstate feature looks like vmsave duplication. The problem with
> vmsave is that it doesn't compose nicely with block jobs or the QMP
> transaction command, which would allow you to snapshot the disks and
> then capture the VM state.
>
> How would VMA fit in if the backup block job took a BlockDriverState
> destination and vmsave worked atomically with backup block jobs? You
> could have QEMU write to NBD server ports that a VMA writer process has
> open. VMA would happen outside the QEMU process.
We want to write to pipes, so what you suggest simply does not work?
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, (continued)
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Kevin Wolf, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Dietmar Maurer, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Kevin Wolf, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Dietmar Maurer, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Kevin Wolf, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Dietmar Maurer, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Kevin Wolf, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Dietmar Maurer, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 4/6] introduce new vma archive format, Kevin Wolf, 2013/02/22
Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu, Stefan Hajnoczi, 2013/02/20
- Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu,
Dietmar Maurer <=
- Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu, Stefan Hajnoczi, 2013/02/21
- Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu, Kevin Wolf, 2013/02/21
- Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu, Dietmar Maurer, 2013/02/21
- Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu, Paolo Bonzini, 2013/02/21
- Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu, Stefan Hajnoczi, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu, Kevin Wolf, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu, Stefan Hajnoczi, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu, Dietmar Maurer, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu, Paolo Bonzini, 2013/02/22
- Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu, Dietmar Maurer, 2013/02/22