topic Re: SAN failover in RHEL4 with QLogic cards in Operating System - Linux

SAN failover in RHEL4 with QLogic cards

Jesper Frank Nemholt — Thu, 12 May 2005 18:18:25 GMT

Hi!

I was testing Clariion CX600 devices today, and in the default configuration I could see my 2 disks as 4 due to the redundant paths, and accessing them via 1 path worked fine, so with single-path everything seems fine.

After testing that, I then enabled the failover feature in the QLogic driver (using the "set_parm -x" script that comes with the HP driver), however after rebooting I now see no disks but just the 2 HBAs (QLogic 2340) and get a truckload of I/O errors in the syslog.

Any hints regarding this ?
I'd like to see /etc/modprobe.conf from someone having a setup that works, as I think my modprobe.conf could be the cause of the problems.

Re: SAN failover in RHEL4 with QLogic cards

David Child_1 — Fri, 13 May 2005 12:07:49 GMT

Jesper,

I went to check on EMCs web site, but I seem to be having problems with my account; did you verify that this card is certified to work with the CX600 (and switches/directors you are using)?

Also, there may be some config changes you need to make to get it to work with the failover settings you are assigning.

David

Re: SAN failover in RHEL4 with QLogic cards

Rick Garland — Fri, 13 May 2005 14:26:48 GMT

Attached is a document from HP concerning the QLogic and Linux and various arrays. Note not all arrays are supported.

I haven't read in-depth, hope it is useful.

Re: SAN failover in RHEL4 with QLogic cards

Jesper Frank Nemholt — Sat, 14 May 2005 09:34:08 GMT

Hi!

Thanks for the doc. It just confirms what I suspected....that the HP version of the QLogic driver is made to support multipath failover only with HP storage, so no-go for EMC storage.

The EMC supported drivers leaves much to wish for, so they're not much better.

I'll just give it a last go with the QLogic stock drivers.