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Re: XFS and XEN

To: xfs@xxxxxxxxxxx
Subject: Re: XFS and XEN
From: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>
Date: Thu, 5 Mar 2009 07:44:39 +0100
In-reply-to: <200902250740.43223@xxxxxx>
Organization: it-management http://it-management.at
References: <200902170959.55077@xxxxxx> <20090224163823.GA19811@xxxxxxxxxxxxx> <200902250740.43223@xxxxxx>
User-agent: KMail/1.10.3 (Linux/2.6.27.19-ZMI; KDE/4.1.3; x86_64; ; )
On Mittwoch 25 Februar 2009 Michael Monnerie wrote:
> Q: Which settings are best with virtualization like VMware, XEN,
> qemu?
>
> The biggest problem is that those products seem to also virtualize
> disk writes in a way that even barriers don't work anymore, which
> means even a fsync is not reliable. Tests confirm that unplugging the
> power from such a system even with RAID controller with battery
> backed cache and hard disk cache turned off (which is save on a
> normal host) you can destroy a database within the virtual machine
> (client, domU whatever you call it).
>
> In qemu you can specify cache=off on the line specifying the virtual
> disk. For others I have no information what to do.

In as question 26 now
http://xfs.org/index.php/XFS_FAQ

mfg zmi
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