[Gluster-users] Glusterfs and Xen - mount option

[Harshavardhana]

Hi Paulo,

    To enable direct io mode from "mount -t glusterfs" you need to provide
an extra option "-odirect-io-mode=yes" as additional command line
parameter.

disable direct io has performance penalty only for fuse kernel module lesser
than 2.6.26. Since 2.6.26 and above with big_writes enabled for pagecached
writes we can use --disable-direct-io-mode safely without having performance
penalty..

All depends on the client side. Recommended is to use XEN images to serve
from glusterfs use latest kernels.

Regards
--
Harshavardhana
Gluster - http://www.gluster.com


On Tue, May 4, 2010 at 11:19 AM, Eduardo Casarero <ecasarero at gmail.com>wrote:

> yesterday i was trying to make that work, i did have to use the
> gluster custom version of unfsd to get xen working on an reexported
> mount point. My lab is not the best to do benchmark but i did copy
> some virtual disks from local storage to nfs and that had a bad
> performance.
>
> 2010/5/4 Paulo Cardoso <pcardoso at ciberconceito.com>:
> > Hi,
> >
> >
> >
> > I've installed Gluster Storage Platform on two servers (mirror) and
> mounted
> > the volume on a client.
> >
> > I had to mount it using  "mount -t glusterfs
> > <MANAGEMENT_SERVER>:<VOLUMENAME-ON-WEBGUI>-tcp <MOUNTPOINT>" because I
> > didn't had a vol file and couldn't generate one with volgen because we
> don't
> > have shell access to the gluster server right?
> > How can I add the option to mount it with --disable-direct-io-mode?
> >
> >
> > I can't find how to do it.
> >
> > Do you recommend using Xen with gluster? How about performance issues?
> >
> >
> >
> > Best Regards
> >
> > Paulo Cardoso
> >
> >
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> >
> >
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