From: Avi Kivity <avi@qumranet.com>
To: Javier Guerra <javier@guerrag.com>
Cc: carlopmart <carlopmart@gmail.com>, kvm@vger.kernel.org
Subject: Re: Sharing disks between two kvm guests
Date: Fri, 20 Jun 2008 21:28:47 +0300 [thread overview]
Message-ID: <485BF6DF.5030903@qumranet.com> (raw)
In-Reply-To: <90eb1dc70806200707k4e08c4d7s41708fc9f84c2a3c@mail.gmail.com>
Javier Guerra wrote:
> i tried this looong ago and didn't really work because there was some
> userspace cache on each QEMU instance. but the -drive option has a
> 'cache=off' setting that should be enough.
>
> in theory (i haven't tested, but Avi 'blessed' it):
> - create a new image with qemu-img
> - add it to the command line using -drive file=xxx,cache=off on both
> KVM instances
> - use a cluster filesystem!
>
This won't work with qcow images as metadata and allocation is not
synchronized. Use raw images. cache=off is not strictly required,
since the Linux pagecache will maintain coherency.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
prev parent reply other threads:[~2008-06-20 18:28 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-20 8:57 Sharing disks between two kvm guests carlopmart
2008-06-20 11:04 ` Felix Leimbach
2008-06-20 12:23 ` carlopmart
2008-06-20 14:07 ` Javier Guerra
2008-06-20 16:32 ` Laurent Vivier
2008-06-20 16:37 ` Anthony Liguori
2008-06-20 18:54 ` Laurent Vivier
2008-06-20 19:30 ` Anthony Liguori
2008-06-20 18:28 ` Avi Kivity [this message]
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