SUMMARY: Qlogic HBA failover loses disk
- From: John Horne <john.horne@xxxxxxxxxxxxxx>
- Date: Mon, 27 Jul 2009 12:45:07 +0100
Hello,
Many thanks to those who replied, and apologies for not replying to some
queries. It seems that the SAN we use (from ipstor), requires a piece of
their own software to be used on Solaris in order for failover to work.
(We weren't told this before.) So, as instructed, I have disabled mpxio
and installed their software. It has helped a bit, but we are still
having a problem with the failover. This has been passed to the ipstor
support people.
Replies were from:
francisco roque
Dean Ross-Smith
Lisa Kachold
Regards,
John.
Original message:
On Fri, 2009-07-17 at 22:36 +0100, John Horne wrote:
Hello,--
We have two Sun T2000 (SPARC) servers running Solaris 10. Each server
has two Qlogic 2460 HBAs. Generally they work fine with our SAN.
However, when the SAN admins cause a failover (the HBA's use
multipathing), Solaris loses connection with the disks completely and
pretty much immediately. Trying to access the disks causes 'I/O error'
errors. We can unmount the disks, but cannot remount them (same error).
So we have to reboot the server.
We have looked at the QLA timers and they seem fine. Likewise we have
looked at Solaris timers such as 'fp_retry_count' and
'fp_offline_ticker'. However, the problem is that the connection is lost
in a very short time - around 5 or 6 seconds. The timers default values
are all way above this, and so should be fine.
If I run the Qlogic sansurfer software ('scli') while the disks are
'lost', then it detects both HBA's and reports them as being online.
Anyone any idea as to what is causing the loss of the disks in such a
short time? It seems to be more a Solaris problem than with the QLA.
Access to the SAN from Windows servers, with Qlogic HBA's, works fine
when failing over. However, the timer values are the same as set on the
Solaris servers.
Thanks,
John.
---------------------------------------------------------------
John Horne, University of Plymouth, UK Tel: +44 (0)1752 587287
E-mail: John.Horne@xxxxxxxxxxxxxx Fax: +44 (0)1752 587001
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