topic Re: checking disk path in Operating System - Linux

checking disk path

Ronald Y. Salem — Mon, 14 Jul 2008 10:51:32 GMT

Hi All,
I am new in Linux and recently I added new LUNs to Linux machine from EVA4000 SAN.

Can you pls let me know how to check the path of the disks (if it's dual path) presented from linux machine? What's the command to do it?

Any help would be appreciated.
Thanks.

Re: checking disk path

Ivan Ferreira — Mon, 14 Jul 2008 12:11:22 GMT

You can use lssd, fdisk -l and ensure that you have a multipath enabled driver for your HBA.

Re: checking disk path

Court Campbell — Mon, 14 Jul 2008 12:25:38 GMT

You can install lsscsi. And then issue the command

# lsscsi -g --transport

You should see duplicate wwn's for the luns. Then if you need want to do mulitpathing you can install dm-multipath.

Re: checking disk path

Ronald Y. Salem — Wed, 16 Jul 2008 03:57:00 GMT

Hi Evan,
May I know how to check if multi path is enable? I am really new with Linux.

I try to execute the command sbin/fdisk -l but nothing been displayed. Thanks.

Re: checking disk path

Court Campbell — Wed, 16 Jul 2008 16:40:14 GMT

You should install dm-multipath. Here is a brief overview:

http://www.redhat.com/docs/manuals/csgfs/browse/4.6/DM_Multipath/MPIO_description.html

Re: checking disk path

skt_skt — Sat, 26 Jul 2008 00:55:18 GMT

do you use any path management s/w like power path/secure path?

Powermt display dev=all might help to list all LUNs with paths including the new one