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Re: [Xen-users] XCP Booting from SAN

To: Thomas Pöhler <tp@xxxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] XCP Booting from SAN
From: Martin Smith <u571kills@xxxxxxxxx>
Date: Tue, 12 Jul 2011 20:13:18 -0500
Cc: xen-users@xxxxxxxxxxxxxxxxxxx, John Madden <jmadden@xxxxxxxxxxx>
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Thomas: Yes, if I disable the other three paths the servers boot quickly. 

John: Its a SUN FLX380 storage array. Would I be looking for the drivers for the fibre card I installed or for the SAN?

On Tue, Jul 12, 2011 at 4:12 PM, Thomas Pöhler <tp@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
You could also try to login the target only once to temporarily "disable" multipathing and see if its booting fine.

Am 12.07.2011 um 22:22 schrieb "John Madden" <jmadden@xxxxxxxxxxx>:

>> 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
> --
> John Madden
> Sr UNIX Systems Engineer / Office of Technology
> Ivy Tech Community College of Indiana
> jmadden@xxxxxxxxxxx
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Martin Smith
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