Multipath , iSCSI and the MD3000i

[Thomas_Chenault at Dell.com]

The MD3000i is typically configured with two RAID controller modules. At
any given time, a virtual disk is owned by one of the two RAID
controller modules. Ownership of the virtual disk does not automatically
transition in response to network failures, and multipathd has no means
by which to tell the MD3000i to change virtual disk ownership. The
solution is to abandon multipathd for this application and use the
multipathing software that is provided with the MD3000i.


Thomas

-----Original Message-----
From: linux-poweredge-bounces at lists.us.dell.com
[mailto:linux-poweredge-bounces at lists.us.dell.com] On Behalf Of Matthew
Geier
Sent: Monday, June 01, 2009 4:09 PM
To: linux-poweredge-Lists
Subject: Multipath , iSCSI and the MD3000i


  I'm having terrible trouble actually getting multipath failover to 
work with an MD3000i on RHEL 5.2.

  I can talk to the array fine, but I have no path redundancy - if I 
reboot a controller or pull one of the LAN cables, the machine hangs on 
access to the filesystem that was being accessed via the now missing 
path, it doesn't swap to the alternate controller.

  I've got multipathd running, multpath -l shows multiple paths, but 
fail-over never actually happens.

  If any one else has some ideas i'll post the multipath config and the 
path output.

  I'm assuming there is something wrong with the path selection.



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