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Re: [Xen-users] XCP Booting from SAN

To: Martin Smith <u571kills@xxxxxxxxx>
Subject: Re: [Xen-users] XCP Booting from SAN
From: John Madden <jmadden@xxxxxxxxxxx>
Date: Tue, 12 Jul 2011 16:20:49 -0400
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One last clarification. The servers still boot, they just take 30
minutes to do so. While they are trying to boot tons of /dev/sd* errors
scroll by on the screen. After the machine finishes booting the I/O
errors appear to stop.

What model SAN is it? I've seen this before and the fix is to install the proper multipath driver (appropriate to your SAN) into your initrd. The i/o errors are coming from the inactive path on an active/passive array. For example, with our IBM DS-4800 array, we had to add the scsi_dh_rdac driver to the initrd so it was available to the multipath stuff that was happening at boot.


John Madden
Sr UNIX Systems Engineer / Office of Technology
Ivy Tech Community College of Indiana

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