RE: Question re asm disks

Bradd,  

Thanks, that is what I have been looking for.  

Bill Wagman
Univ. of California at Davis
IET Campus Data Center
wjwagman_at_ucdavis.edu
(530) 754-6208

From: Bradd Piontek [mailto:piontekdd_at_gmail.com] Sent: Thursday, May 08, 2008 9:50 AM
To: William Wagman
Cc: oracle-l_at_freelists.org
Subject: Re: Question re asm disks  

You may want to use '/etc/init.d/oracldasm with the querydisk option. this should give you the device numbers for that particular disk.

ex.
/etc/init.d/oracleasm querydisk DATA100_0019 Disk "DATA100_0019" is a valid ASM disk on device [120, 113]

I think go to the device directory and see what 120,113 corresponds to.

On 5/8/08, William Wagman <wjwagman_at_ucdavis.edu> wrote:

Greetings,

I hope this isn't a naïve question but anyway, I am using ASM on a two node RAC cluster, Oracle 10.2.0.3.0 SE on Red Hat EL4. The raw devices look like this...

crw-rw----  1 root   dba 162,  1 May  6 14:45 /dev/raw/raw1
crw-rw----  1 oracle dba 162, 10 May  6 14:45 /dev/raw/raw10
crw-rw----  1 oracle dba 162, 11 May  7 10:36 /dev/raw/raw11
crw-rw----  1 root   dba 162,  2 May  6 14:45 /dev/raw/raw2
crw-r--r--  1 oracle dba 162,  3 May  6 14:45 /dev/raw/raw3
crw-r--r--  1 oracle dba 162,  5 May  6 14:45 /dev/raw/raw5
crw-r--r--  1 oracle dba 162,  6 May  6 14:45 /dev/raw/raw6
crw-rw----  1 oracle dba 162,  7 May  6 14:45 /dev/raw/raw7
crw-rw----  1 oracle dba 162,  8 May  6 14:45 /dev/raw/raw8
crw-rw----  1 oracle dba 162,  9 May  6 14:45 /dev/raw/raw9

I know which are used for the CRS and voting disks but I am trying to determine which of the others make up the ASM disk groups and I can't find information on how to do that. The disk groups have been provisioned using asmlib. Querying v$asm_disk returns the following...

SQL> select group_number,name,substr(path,1,30) from v$asm_disk;

GROUP_NUMBER NAME                           SUBSTR(PATH,1,30)
------------ ------------------------------ ------------------------------
           0                                /dev/raw/raw10
           0                                /dev/raw/raw9
           0                                /dev/raw/raw8
           0                                /dev/raw/raw7
           0                                /dev/raw/raw6
           0                                /dev/raw/raw5
           0                                /dev/raw/raw3
           0                                /dev/raw/raw11
           0                                /dev/raw/raw1
           0                                /dev/raw/raw2
           1 VOL1                           ORCL:VOL1
           1 VOL2                           ORCL:VOL2
           2 VOL3                           ORCL:VOL3

For example which of the raw devices are mapped to VOL1? I suspect I am not understanding something or else just have not found the appropriate view to query but if someone can help me out I would be most appreciative.

Thanks.

Bill Wagman
Univ. of California at Davis
IET Campus Data Center
wjwagman_at_ucdavis.edu
(530) 754-6208

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