Re-using LUNs which were part of another DG

Question

CRS version : 11.2
os : AIX 6.1
We have some LUNs allocated to our DB server. These LUNs used to be MEMBER of another disk group. Later these LUNs got dropped from that disk group. Now, V$ASM_DISK.HEADER_STATUS = FORMER for these LUNs.
select name, path, state, mount_status, header_status from v$asm_disk where upper(path) like '%ORCL%';
NAME                 PATH                       STATE    MOUNT_STATUS         HEADER_STATUS          TOTAL_MB    FREE_MB
                     /dev/raw_orcl_data01        NORMAL   CLOSED               FORMER                    0          0Now we need to use these 'FORMER' LUNs to create another diskgroup.
Any intervention is required from AIX team to use LUN/Slice with FORMER status to use in another DG ?
I am worried because we usually add LUNs to a Disk group only if V$ASM_DISK.HEADER_STATUS = CANDIDATE for that LUN.
Edited by: GarryB on Mar 13, 2012 5:21 AM
Added version info

Answer 1

GarryB wrote:
We have some LUNs allocated to our DB server. These LUNs used to be MEMBER of another disk group. Later these LUNs got dropped from that disk group. Now, V$ASM_DISK.HEADER_STATUS = FORMER for these LUNs.
select name, path, state, mount_status, header_status from v$asm_disk where upper(path) like '%ORCL%';
NAME                 PATH                       STATE    MOUNT_STATUS         HEADER_STATUS          TOTAL_MB    FREE_MB
/dev/raw_orcl_data01        NORMAL   CLOSED               FORMER                    0          0Now we need to use these 'FORMER' LUNs to create another diskgroup.
Any intervention is required from AIX team to use LUN/Slice with FORMER status to use in another DG ? If the disk was dropped cleanly then its header status wold be FORMER, so you are good to go using that disk in another diskgroup...But before doing so, you have to clean its headerstaus with "dd" command to make its status as candidate..
I am worried because we usually add LUNs to a Disk group only if V$ASM_DISK.HEADER_STATUS = CANDIDATE for that LUN.Ask you admin guys to clean that for you...
For example
dd if=/dev/zero bs=8k count=1000 of=/dev/rhdisk12 ->rhdisk12 is the disk you want to use
Once above command is executed, see its status from v$asm_disk. It shoule have candidate status
See also
http://shettymayur.blogspot.in/2011/03/cleaning-oracle-asm-disk-headers.html
http://oracle.su/docs/11g/server.112/e10500/asmdiskgrps.htm