From: Michael Monnerie <michael.monnerie@is.it-management.at>
To: xfs@oss.sgi.com
Subject: Re: XFS and XEN
Date: Thu, 5 Mar 2009 07:44:39 +0100 [thread overview]
Message-ID: <200903050744.39283@zmi.at> (raw)
In-Reply-To: <200902250740.43223@zmi.at>
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
--
// Michael Monnerie, Ing.BSc ----- http://it-management.at
// Tel: 0660 / 415 65 31 .network.your.ideas.
// PGP Key: "curl -s http://zmi.at/zmi.asc | gpg --import"
// Fingerprint: AC19 F9D5 36ED CD8A EF38 500E CE14 91F7 1C12 09B4
// Keyserver: wwwkeys.eu.pgp.net Key-ID: 1C1209B4
_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs
next prev parent reply other threads:[~2009-03-05 6:45 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-17 8:59 XFS and XEN Michael Monnerie
2009-02-17 9:11 ` Christoph Hellwig
2009-02-17 14:00 ` Michael Monnerie
2009-02-19 19:35 ` Christoph Hellwig
2009-02-21 9:03 ` Michael Monnerie
2009-02-24 15:04 ` Michael Monnerie
2009-02-24 16:38 ` Christoph Hellwig
2009-02-25 6:40 ` Michael Monnerie
2009-03-05 6:44 ` Michael Monnerie [this message]
2009-03-03 20:56 ` Michael Monnerie
2009-03-04 2:42 ` Michael Monnerie
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=200903050744.39283@zmi.at \
--to=michael.monnerie@is.it-management.at \
--cc=xfs@oss.sgi.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox