topic Re: SGLX and Multipathing without lock-lun in Operating System - Linux

SGLX and Multipathing without lock-lun

hensko — Fri, 19 Oct 2007 05:49:32 GMT

DM-MPIO is not supported by ServiceGuard for Linux, but if I use a Quorum-server instead of lock-lun. Is that possible, or even supported??
Iḿ going to use it with EMC SYMMETRIX SAN.

Re: SGLX and Multipathing without lock-lun

melvyn burnard — Fri, 19 Oct 2007 09:57:10 GMT

What are you asking is supported or possible?
Using a QS instead of a Lock Lun?
YES it is

Re: SGLX and Multipathing without lock-lun

Colin Topliss — Mon, 22 Oct 2007 15:29:11 GMT

Hi,

Don't bother trying to use a lock lun. It isn't implemented properly at all under Linux (its horrible, gave me no end of grief), and no, MPIO is not supported either.

Switch to using a quorum server. The RPM is provided with the SG CD, and its real easy to set up. I switched to using a quorum server ages ago and never looked back since.

Colin

Re: SGLX and Multipathing without lock-lun

hensko — Fri, 26 Oct 2007 08:30:25 GMT

Hmm, Iá¸¿ not that good to explain my problems.
Iá¸¿ already running a Qourum server, and that works really good. But the problem is that I want to use DM-MPIO for the cluster volumes. I just wonder why HP wont support this. I cant imaging what ServiceGuard want to do under LVM. As far as the logical volumes are there, all should be fine.

Re: SGLX and Multipathing without lock-lun

John Bigg — Wed, 31 Oct 2007 12:05:22 GMT

DM is not supported since it was found to be unreliable during testing. There is a plan to support this once the stability is better. Technically you could use it now just as you can in reality do many unsupported things, often without trouble but then one day you get bitten.

Re: SGLX and Multipathing without lock-lun

srp_1 — Tue, 11 Dec 2007 15:01:44 GMT

As far as i know, at the time of last releas of Servicequard, scsi enquiry ioctl's support required for the locklun is not available in the linux kernal to supprt DM-MP. Now only Rh4.5[2.6.9.54 or above kernal] and RH5 has the fix for it. not sure about the SUSE.