[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks.
From: |
Richard W.M. Jones |
Subject: |
Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks. |
Date: |
Tue, 8 Dec 2009 10:16:26 +0000 |
User-agent: |
Mutt/1.5.18 (2008-05-17) |
On Tue, Dec 08, 2009 at 10:48:17AM +0100, Kevin Wolf wrote:
> Am 07.12.2009 15:31, schrieb Richard W.M. Jones:
> > So to be clear, the use case is that all the other VMs must be shut
> > down, then the VM which wants to commit will upgrade its lock and
> > commit, and then all the other VMs will restart? I agree this should
> > avoid corruption, although it sounds like something which is fairly
> > unlikely to be done in practice.
>
> I can't see how the file system of VM2 could possibly survive if VM1
> commits its changes. Even if VM2 or even both VMs are shut down while
> we're corrupting the base image.
Yes, I see, you're correct - even if the VMs are shut down, committing
to the backing file will result in corruption.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-top is 'top' for virtual machines. Tiny program with many
powerful monitoring features, net stats, disk stats, logging, etc.
http://et.redhat.com/~rjones/virt-top
- Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks., (continued)
- Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks., Kevin Wolf, 2009/12/08
- Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks., Richard W.M. Jones, 2009/12/07
- Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks., Richard W.M. Jones, 2009/12/07
- Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks., Jamie Lokier, 2009/12/07
- Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks., Anthony Liguori, 2009/12/07
- Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks., Richard W.M. Jones, 2009/12/07
- Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks., Anthony Liguori, 2009/12/07
- Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks., Richard W.M. Jones, 2009/12/07
- Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks., Anthony Liguori, 2009/12/07
- Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks., Kevin Wolf, 2009/12/08
- Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks.,
Richard W.M. Jones <=
- [Qemu-devel] Re: [PATCH] Disk image shared and exclusive locks., Paolo Bonzini, 2009/12/07
Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks., Daniel P. Berrange, 2009/12/07
Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks., Chris Webb, 2009/12/07
[Qemu-devel] [PATCH VERSION 2] Disk image shared and exclusive locks., Richard W.M. Jones, 2009/12/07