Re: AW: [Xen-users] Deploying redhat clusters under Xen 3.0.2

["Christopher G. Stach II" <cgs@xxxxxxxxx>]

carlopmart wrote:
> Many thanks Thomas.
>
> thomas.vonsteiger@xxxxxxxxxx wrote:
> > >   - can this change affects to all disks in the guest, included node
> > > disk??
> > Yes, it has affects to all for xen guest defined disks.
> > Maybe in future we can define storage for xen guests nonshared by 
> > default or
> > shared. This is only if you setup cluster with shared disk on one xen 
> > host.
> > >   - How can I setup virtual storage in config file, as a normal disk
> > > without any param??
> > I don't now your question.
> > Have a look here:
> > http://www.cl.cam.ac.uk/Research/SRG/netos/xen/readmes/user/user.html#SECTIO 
> >
> > N03300000000000000000
> >
> > This is my storage config node1 for rhcs with gfs to play and learn about
> > this. All is done by lvm:
> >
> > disk = [ 'phy:/dev/xenvg/xenRHEL4_3,ioemu:hda,w',
> > 'phy:/dev/xenvg/xenCLU1fs1,ioemu:hdb,w',
> > 'phy:/dev/xenvg/xenCLU1fs2,ioemu:hdc,w' ]
> >
> > >   - If I use GFS and two nodes writing at same time, can this virtual
> > > storage be corrupted??
> > No, gfs is developed for such scenarios.
> > http://www.redhat.com/docs/manuals/csgfs/
> >
> >
> > Thomas
> >
> > > -----Ursprüngliche Nachricht-----
> > > Von: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-
> > > bounces@xxxxxxxxxxxxxxxxxxx] Im Auftrag von carlopmart
> > > Gesendet: Montag, 21. August 2006 09:24
> > > Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> > > Betreff: Re: [Xen-users] Deploying redhat clusters under Xen 3.0.2
> > >
> > > Tim, more information:
> > >
> > >   - I wneed to use GFS filesystem for this virtual storage.
> > >   - I do not use heartbeat, I have to deploy this configuration with
> > > RedHat Cluster Suite.
> > >   - Only one network interface per node using 100Mb private netowrk.
> > >
> > > Thomas,
> > >
> > >   About this:
> > >
> > >   If you change in /etc/xen/scripts/block Line 105 and 116 from
> > >        echo ‘local’
> > > to:
> > >        echo ‘ok’.
> > >
> > > I have some questions:
> > >
> > >   - can this change affects to all disks in the guest, included node
> > > disk??
> > >   - How can I setup virtual storage in config file, as a normal disk
> > > without any param??
> > >   - If I use GFS and two nodes writing at same time, can this virtual
> > > storage be corrupted??
> > >
> > > Many thanks
> > >
> > >
> > >
> > > Tim Post wrote:
> > > > On Fri, 2006-08-18 at 22:42 +0200, carlopmart wrote:
> > > > > Hi all,
> > > > >
> > > > >   I need to deploy different RedHat servers with Cluster Suite under
> > > Xen
> > > > > (using Intel VT hardware for hosts). To accomplish this, I need to
> > > setup
> > > > > a virtual shared storage disk to serve for several nodes. Can Xen 
> > > > > 3.0.2
> > > > > support disk locking feature to deploy clusters (Load balancing and HA
> > > > > configs) as vmware products support? Is this feature supported by xen?
> > > > > And my last question: can I use virtual scsi disk to use as a shared
> > > > > storage?
> > > > >
> > > > > Many thanks.
> > > > Some more information about your cluster would be helpful :) How many
> > > > nics per node, and is one of those nics talking to a private gig-e
> > > > network?
> > > >
> > > > We use xen to help manage or completely contain everything from open 
> > > > SSI
> > > > to our own pound / lighty / drbd / heartbeat based concoctions and 
> > > > quite
> > > > frankly I can't see doing without Xen in the future when it comes to
> > > > both ha / load balanced and hpc clusters.
> > > >
> > > > Have you looked at gfs?
> > > >
> > > > Cheers
> > > > -Tim
> > > --
> > > CL Martinez
> > > carlopmart {at} gmail {d0t} com
> > >
> > > _______________________________________________
> > > Xen-users mailing list
> > > Xen-users@xxxxxxxxxxxxxxxxxxx
> > > http://lists.xensource.com/xen-users
> > >
> > >
> > > --
> > > No virus found in this incoming message.
> > > Checked by AVG Free Edition.
> > > Version: 7.1.405 / Virus Database: 268.11.3/423 - Release Date: 
> > > 18.08.2006
I had CLVM, CMAN, CCS, and GFS set up on a development Xen cluster.  I 
just got rid of Xen because we were needed the full machine performance. 
 Basically, we were going in the opposite direction that virtualization 
is. :)  It worked fine most of the time, but there are some things I 
would do differently.  First, don't let dom0 manage any of the storage. 
 Use one of GNBD, iSCSI, AoE, etc. and dedicated private network cards 
for each domain.  I wouldn't even bother bridging vifs.  Second, use the 
new credit scheduler.  If you decide to not take this advice, expect to 
be turning your CMAN timeouts way up when you find your domains stalling 
and getting fenced multiple times a day. :)  It would be nice if the 
dom0 <-> domU traffic worked so fence_xen functioned.  If you can't get 
it to work, say hello to fence_manual.  Not fun.
--
Christopher G. Stach II

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users