 | | | Subject: Re: Qlogic failover with Hitachi 9960 | Subject: Re: Qlogic failover with Hitachi 9960 2007-08-28 - By Tom G. Christensen
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Coe, Colin C. (Unix Engineer) wrote:
> Hi all
>
> I've googled extensively for the past couple of days and have logged a
> service request with RH support but no joy.
>
> We have a Hitachi 9960 on which 3 LUNs have been allocated to my server.
> My server running RHEL3u9 (x86_64), has two qla2460s and both see the
> LUNs.
>
<snip>
>
> My problem is I'm unsure how to refer to the LUNs. The LUNs are on:
> - /dev/sdb and /dev/sde
> - /dev/sdc and /dev/sdf
> - /dev/sdd and /dev/sdg
> I need to put all the LUNs in a VG. Do I put all the paths in the VG?
>
No.
> How does failover/failback occur?
>
You've got a few options:
1. If the array is active/active you can try using md-multipath (managed
by mdadm). This is AFAIK the only multipath option Redhat supports on RHEL3.
2. You could enable failover in the qlogic driver and see if it works
for your setup. This is AFAIK not directly supported by Redhat but
vendors like HP supports this for their EVA arrays.
3. Vendor supported multipath solution using a commercial multipathing
product.
If it's possible I'd recommend upgrading to RHEL4 or 5. It's got much
better support for multipathing using devicemapper (dm-multipath).
-tgc
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