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Re: [Qemu-devel] [PATCH 2/2] drive_open: Add invalidate option for block
From: |
Juan Quintela |
Subject: |
Re: [Qemu-devel] [PATCH 2/2] drive_open: Add invalidate option for block devices |
Date: |
Thu, 10 Nov 2011 17:45:21 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.3 (gnu/linux) |
Kevin Wolf <address@hidden> wrote:
> Am 09.11.2011 20:16, schrieb Juan Quintela:
>> Linux allows to invalidate block devices. This is needed for the incoming
>> migration part.
>>
>> Signed-off-by: Juan Quintela <address@hidden>
>
> I think Christoph said that this ioctl kills ramdisks? Or was that
> something different?
On patch 0/2 I said that I was not proposing this. That this "kind" of
fixed the problem for iscsi and linux, but that it is not "reliable".
Patch 2/2 was to start discussion, and to show the problem we had to
fix, not a "solution".
As said during the discussion:
- clustered filesystems: they are good
- non-coherentent shared storage (NFS, iSCSI, ...): needs cache=none,
anything else is insane
- formats (qcow2): needs reopen, or at least reload metadata.
And the discussion is how to go from here.
Later, Juan.
Re: [Qemu-devel] [RFC PATCH 0/2] Fix migration with NFS & iscsi/Fiber channel, Stefan Hajnoczi, 2011/11/10
Re: [Qemu-devel] [RFC PATCH 0/2] Fix migration with NFS & iscsi/Fiber channel, Juan Quintela, 2011/11/23