How to tell what physical disk is an ASM volume?

Question

Hello all,
I'm trying to install some clusterware. I have attached, a SAN unit, that was previously used for ASM.
After I installed the ASM libs/drivers...I ran oracleasm scandisks, and it found all of them.
I have ASM1,ASM2....ASMn
I thought, "great"..saves me time having to go through, find each disk device and configure them. I don't mind losing data on them.
I'm in the middle of the OUI for cluster install (11Gr2 on RHEL5)...and on the ASM portion (getting ready to create a disk group for the cluster for voting disk, etc)...well, under candidate disks...it shows nothing.
If I click the all disks option..it shows all my oracle volumes...but their status is 'member'. It will not allow me to add them to my to be new disk group.
I'm not sure what to do.
One problem...is that I can't seem to find a way to find out what physical disk device is associated with each ASM disk.
For instance:
oracleasm querydisk ASM33
Disk "ASM33" is a valid ASM disk
It just shows it's a valid disk...but if I wanted to release it, reconfigure it..etc, I don't know what physical disk it is, and I'd like to use the same layout that was used before.
Is there a way to find out what disk (example: /dev/sda12) is associated with ASM33?
I don't see any options listed for this in the man page for oracleasm, and I can't seem to find much documentation for this either...
Thanks in advance,
cayenne

Answer 1

Well for this you can use oracleasm querydisk.Using this you can identify which device as marked for asm or not. for example you can see this below example.
[oracle@localhost init.d]$ sqlplus "/as sysdba"
SQL*Plus: Release 10.2.0.4.0 - Production on Thu Jun 3 11:52:12 2010
Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> select path from v$asm_disk;
PATH
/dev/oracleasm/disks/VOL2
/dev/oracleasm/disks/VOL1
SQL> exit;
[oracle@localhost init.d]$ su
Password:
[root@localhost init.d]# /sbin/fdisk -l
Disk /dev/sda: 80.0 GB, 80000000000 bytes
255 heads, 63 sectors/track, 9726 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        1305    10482381   83  Linux
/dev/sda2            1306        9401    65031120   83  Linux
/dev/sda3            9402        9662     2096482+  82  Linux swap / Solaris
/dev/sda4            9663        9726      514080    5  Extended
/dev/sda5            9663        9726      514048+  83  Linux
Disk /dev/sdb: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1        4859    39029886   83  Linux
/dev/sdb2            4860        9729    39118275   83  Linux
[root@localhost init.d]# ./oracleasm querydisk /dev/sdb1
Device "/dev/sdb1" is marked an ASM disk with the label "VOL1"
[root@localhost init.d]# ./oracleasm querydisk /dev/sdb2
Device "/dev/sdb2" is marked an ASM disk with the label "VOL2"
[root@localhost init.d]# ./oracleasm querydisk /dev/sda1
Device "/dev/sda1" is not marked as an ASM disk
[root@localhost init.d]#Also in windows :
C:\Documents and Settings\comp>asmtool -list
NTFS                             \Device\Harddisk0\Partition1           140655M
ORCLDISKDATA1                    \Device\Harddisk0\Partition2             4102M
ORCLDISKDATA2                    \Device\Harddisk0\Partition3             4102M
NTFS                             \Device\Harddisk0\Partition4           152617M
C:\Documents and Settings\comp>answered by chinar in thread:how to identify which rawdevice Disk Is named as VOL1 IN ASM from os level