topic Re: multipathing for sglx on rhel 4 in Operating System - Linux

multipathing for sglx on rhel 4

joseph pareti — Mon, 23 Jul 2007 01:02:12 GMT

I am planning to use 2 dl360-g5's connected to an msa 1500. Each proliant has 2 HBA's cnfigured:

0b:00.0 Fibre Channel: Emulex Corporation Zephyr-X LightPulse Fibre Channel Host Adapter (rev 02)
0b:00.1 Fibre Channel: Emulex Corporation Zephyr-X LightPulse Fibre Channel Host Adapter (rev 02)
13:00.0 Fibre Channel: QLogic Corp. ISP2432-based 4Gb Fibre Channel to PCI Express HBA (rev 02)

The SGLX A.11.18 release notes recommend using the qlogic driver, "Using the QLogic HBA driver for single-path or multipath failover mode on Linux systems", but how to handle the emulex device for the redundant path?

Re: multipathing for sglx on rhel 4

skt_skt — Mon, 23 Jul 2007 22:08:36 GMT

Could you specify the RH release and the kernel

Re: multipathing for sglx on rhel 4

skt_skt — Mon, 23 Jul 2007 22:09:28 GMT

just noticed the subjetc..So what is the update?

Re: multipathing for sglx on rhel 4

joseph pareti — Tue, 24 Jul 2007 03:28:43 GMT

i am using rhel 4 u5
### OS status and version
Linux version 2.6.9-55.ELsmp (brewbuilder@hs20-bc2-4.build.redhat.com) (gcc version 3.4.6 20060404 (Red Hat 3.4.6-3)) #1 SMP Fri Apr 20 16:36:54 EDT 2007

Re: multipathing for sglx on rhel 4

Serviceguard for Linux — Tue, 24 Jul 2007 20:55:02 GMT

The document was not update when we supported Emulex. Serviceguard for Linux supports the Multipath functionality delivered by the driver. So using the Emulex multipath functionality is supported.

I believe this is listed in the certification matrix

Re: multipathing for sglx on rhel 4

joseph pareti — Wed, 25 Jul 2007 04:43:04 GMT

OK, it's good to know that Emulex is supported, but I would need some "how-to" guide to define multipathing.

I have one Emulex and One Qlogic HBA in each server; the documentantion in "HP StorageWorks Using the QLogic HBA driver for
single-path or multipath failover mode on Linux systems application notes" only covers Qlogic.

Re: multipathing for sglx on rhel 4

Serviceguard for Linux — Wed, 25 Jul 2007 08:49:29 GMT

You should post two questions to one of the storage forums.

1) Is it supported to have QLogic and Emulex in the same server with both multipaths enabled.

2) How do you enable multipath on Emulex on Linux.

I am not sure if #1 is supported but I believe someone in that forum will know.

Re: multipathing for sglx on rhel 4

ralfbosz — Mon, 30 Jul 2007 06:22:40 GMT

For number 2 I can give you this link from RedHat I found (and used for our SAN multipathing): http://people.redhat.com/nayfield/storage/RHEL4Storage.html

This was used on a system without ServiceGuard (so just a machine having some SAN-disks). For the shared LVM this can be used, but not for the LOCK-lun, that has to be a cciss of sd? device (bummer).

Re: multipathing for sglx on rhel 4

Serviceguard for Linux — Mon, 30 Jul 2007 08:29:00 GMT

To be clear, for Serviceguard for Linux, HP does not yet support DeviceMapper.

Re: multipathing for sglx on rhel 4

joseph pareti — Tue, 31 Jul 2007 11:28:04 GMT

indeed, it is also my understanding that we need to rely on the HBA's for multipathing.

In addition MSA 1500 should be configured in active/active mode according to the following documentation:

http://essa.corp.hp.com/salesportal/hptf2006/final_presentations/1350_McConnell.ppt (slide 44 and following )

http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00865820/c00865820.pdf