Re: Linux devices for ASM

From: Dan Norris <>
Date: Mon, 09 Jun 2008 20:40:03 -0600
Message-ID: <>


On RHEL 4, you likely are using the multipath package, so you can find
device-to-WWID mappings in /var/lib/multipath/bindings and "multipath
-l" may help identify disks. If you're using iSCSI, then "iscsi-ls -l"
may also help along with the other commands cited here. 

I'm also a big fan of the "old school" viewing of disk information via /proc/partitions which gives device names and maj/min numbers as cached by the kernel. I know of no more direct way to see what the kernel thinks the disks are at any given point.


Matthew Zito wrote:

You can look in /dev/oracleasm/disks at the Major and Minor numbers, and then map that back to the major and minor numbers of the mpath devices (assuming you are using asmlib).




From: [] On Behalf Of Allan Nelson
Sent: Monday, June 09, 2008 10:16 AM
To: Oracle-L Freelists
Subject: Linux devices for ASM


We had consultant come in and build a 3 node rac for us.  I need to know how to find out which /dev/mapper/mpath devices are used in the asm diskgroup.
Oracle 10gR2
RHEL 4.6


-- Received on Mon Jun 09 2008 - 21:40:03 CDT

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