topic Re: Quorum Disk Multipath in Operating System - Linux

Quorum Disk Multipath

ManojK_1 — Tue, 14 Dec 2010 09:23:39 GMT

Hi,

We are planning to cluster two RedHat linux systems which are connected to EVA8000. Each Lun which is present from EVA8000 is having 8 Path in the RedHat Server.

I want to specify only the virtual path of this device for lock lun. So that it will automatically do a failover and loadbalancing if some thing is happening to the FC Link.

How can achieve this?

Serviceguard version is serviceguard-A.11.18.00-0.rhel4.

Manoj K

Re: Quorum Disk Multipath

Alzhy — Tue, 14 Dec 2010 17:51:24 GMT

Use the correct device-mapper multipath configuration. Search, download and install HP Device Mapper Multipath apt for the version of Linux you have.

Once installed and correctly running, each EVA8 VDISK shall have a /dev/mpath/mpathNN entry whose individual disk path/members and VDISK WWID you can display via: "multipath -ll"

If you want to give your multipathed device (aka your virtual path/device) a friendlier name or even to be automagically owned by oracle:dba -- all without writing UDEV scripts. Simply add an entry in your /etc/multipath.conf's multipaths section like:

multipath {
wwid 3600508b40006a5d50000f00001160000
alias EVA8_LUN01
mode 0644
uid 501
gid 501
}

Then do multipath -v3 and you will now have a friendly, oracle owned /dev/mapper/EVA8_LUN01 that you may partition or use anyway you like.

Cheers!

Re: Quorum Disk Multipath

Alzhy — Tue, 14 Dec 2010 18:11:26 GMT

Serviceguard version is serviceguard-A.11.18.00-0.rhel4.

Hmmm -- so RHEL 4.8? I am not suer if there is HPDM for that release...

Why not just go with RHEL 5 (5.5 specially) and just use RHCS/GFS solution instead of the sunset product ServiceGuard. ServiceGuard for Linux ended sales like 2+ years ago as the built-in (for Advanced Platform RHEL) does a good enough job anyway.