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Re: [Xen-users] does live migration require a cluster aware filesystem?

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Subject: Re: [Xen-users] does live migration require a cluster aware filesystem?
From: "Fajar A. Nugraha" <fajar@xxxxxxxxxxxxx>
Date: Tue, 06 Nov 2007 14:41:27 +0700
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Tomoki Taniguchi wrote:
> I can't seem to get find a straight answer to this question,
> so i decided to ask it directly.
> If i want to do a live migration between two xen servers which has the domainU
> filesystem shared to them using nbd, does the filesystem have to be
> cluster aware like
> gfs?  or can it be ext3 since technically the two servers should never
> be writing to
> the filesystem at the same time?
If you store domU disks as files on dom0, then yes, you need a cluster
file system.
If you store domU disks as LVM (or other block device) on dom0, then no.
Both dom0 involved in migration simply need to have access to the same
block device. For example, you can have a server exporting LVs via
iscsi, and several dom0's using them as domU storage.

> I was thinking since windows servers with ntfs filesystems doesn't
> seem to have a problem,

Really? Are you saying that two windows servers can mount the same
ntfs-formatted block device at the SAME TIME without a problem?



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