[DRBD-user] Citrix XenServer 5.5 + drbd for HA

Scott Inderlied scott at northwestcomputer.biz
Mon Nov 2 10:58:18 CET 2009

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

I have a support agreement and therefore have access to the extended guide,
yet I can't find mention of xenserver specifics. I'm hitting my head against
the wall right now with SR's, LVM, and DRBD.

-----Original Message-----
From: drbd-user-bounces at lists.linbit.com
[mailto:drbd-user-bounces at lists.linbit.com] On Behalf Of Adam Gandelman
Sent: Sunday, October 18, 2009 17:32
To: drbd-user at lists.linbit.com
Subject: Re: [DRBD-user] Citrix XenServer 5.5 + drbd for HA

Hi Ingmar-

DRBD can be used from within xenserver to replicate storage
repositories.  This is documented in our extended users guide.  You can
also use DRBD to build HA iSCSI/NFS clusters to serve HA SRs to an
entire xenserver pool.  However, HA on the VM level is the job of a
higher level cluster manager and, AFIK, this is either not possible to
do with OCF-based CRMs or nobody has developed it yet.  It is something
I plan on looking into in the coming months.  Citrix offers an
enterprise add-on for this but it does not provide any redundancy on the
storage level, so some other  form of shared storage (more $$) is
required.  If you need HA storage repositories for your xenserver domUs,
DRBD is a relatively easy "drop in" solution.

If you do not need or want the features of XenServer/XenCenter,
heartbeat/pacemaker can monitor OSS Xen domUs in addition to DRBD. 
There is an Xen OCF script that is shipped with Pacemaker.

hope that helps

Beck Ingmar wrote:
> Hi,
> are there news regarding Citrix XenServer 5.5 and drdbd as HA solution?
> Florian told me some months ago that so far there is no known solution
> for this.
> Has someone already implemented this? Is there a guide / how-to for this
> solution?
> Is this solution better or worse than a HA-cluster with Xen-OS and
> drbd to
> eg Debian 5. What would be the advantages and disadvantages of this
> solution?
> regards
> Ingmar
> ------------------------------------------------------------------------
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: Adam Gandelman
: Telephone: 1-503-573-1262 Ex. 203
: LINBIT | Your Way to High Availability
: Sales: 1-877-4-LINBIT / 1-877-454-6248
: http://www.linbit.com

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