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[Qemu-devel] [PATCH VERSION 2] Disk image shared and exclusive locks.
From: |
Richard W.M. Jones |
Subject: |
[Qemu-devel] [PATCH VERSION 2] Disk image shared and exclusive locks. |
Date: |
Mon, 7 Dec 2009 14:16:52 +0000 |
User-agent: |
Mutt/1.5.18 (2008-05-17) |
Here's a second go at this patch. The only change is that we add a
second parameter (backinglock=none|shared|exclusive) which can be used
to control locking on the first level (only) of backing disk.
Dan Berrange convinced me there was a case to retain a distinct shared
locking type.
For any qemu instance which is going to use the "commit" command, I
would advise using: lock=exclusive,backinglock=exclusive.
For qemu instances which won't be using commit, I would advise:
lock=exclusive,backinglock=shared.
For qemu instances which are using GFS-like shared filesystems, I
would advise: lock=shared.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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0001-Disk-image-shared-and-exclusive-locks.patch
Description: Text document
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 <=