Re: Linux devices for ASM

From: Viljo Hakala <viha_at_kapsi.fi>
Date: Mon, 9 Jun 2008 18:25:48 +0300
Message-ID: <20080609152548.GA21563@kapsi.fi>

In Linux, multipathing can be configured at /etc/multipath.conf

Look at the "alias" entries. Usually /dev/mapper/* disks should be logically named (ie. alias - crsdisk01 etc.)

Also note how the RAW devices were created for voting and cluster registry disks.

Btw, Oracle Clusterware takes an automatic backup of the cluster registry.

/etc/init.d/oracleasm listdisks # logical ASM disks

Then check ls /dev/oracleasm/disks

ls /dev/oracleasm/disks | grep DISK_NAME

export ORACLE_SID=+ASM

$ sqlplus '/ as sysdba'
...

SQL> show parameter asm_diskstring;

NAME                                 TYPE        VALUE
------------------------------------ -----------
------------------------------
asm_diskstring                       string      /dev/oracleasm/disks/*

SQL> select path from v$asm_disk;

PATH

---

/dev/oracleasm/disks/DISK1

O Mon, Jun 09, 2008 at 11:11:01AM -0400, 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).
>
>
>
> Matt
>
>
>
> ________________________________
>
> From: oracle-l-bounce_at_freelists.org
> [mailto:oracle-l-bounce_at_freelists.org] 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 10.2.0.4
> RHEL 4.6
>
> Thanks
> Allan
>

-- 
Viljo Hakala
DBA & Oracle Certified Professional
--
http://www.freelists.org/webpage/oracle-l

Received on Mon Jun 09 2008 - 10:25:48 CDT