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[Xen-users] Quorum disk problem

To: <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-users] Quorum disk problem
From: Kędziora Marek <Marek.Kedziora@xxxxxxx>
Date: Thu, 31 Jan 2008 08:55:28 +0100
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Thread-topic: Quorum disk problem
Hi! 
I have a problem setting up cluster of w2k3 servers. My configurations looks 
like this: 

server1: dom0 (centos5): virtual1 (w2k3) 
server2: dom0 (centos5): virtual2 (w2k3) 

I want to make a cluster with two nodes: virtual1 and virtual2. 
I have a quorum disk set up on SAN, both dom0 configures it via HBA 
(qlogic card with HP driver) as scsi /dev/sdb:

SAN.quorum -> server1 hba (/dev/sdb) -> virtual1
SAN.quorum -> server2 hba (/dev/sdb) -> virtual2

Then it is passed as block device to domU with this xen config: 

disk = [ ..<other disks>..., 'phy:/dev/sdb:sdb:w' ]

Everything would be fine except that changes made to quorum disk 
on active node are not seen after changing active node to the other 
one. It looks like all changes are cached somewhere and active node 
writes to this same disk as it would be two different disks. After rebooting 
both nodes only changes from first active node are written to disk.

Could you please help me in setting up the quorum disk ? 
TIA 
Best regards
Marek Kedziora

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