ORA-15024: discovered duplicately numbered ASM disk(Doc ID 1457185.1)
Information in this document applies to any platform.
***Checked for relevance on 21-Jan-2014***
SYMPTOMS
On : 10.2.0.4 version, STORAGE
ASM failed to start
after server reboot, the disk group can not mount,If you try to mount it you may get below error
SQL> alter diskgroup DATA MOUNT;
alter diskgroup DATA MOUNT
*
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15024: discovered duplicately numbered ASM disk 4
CHANGES
There could have been duplication of Major/Minor number at the os level.
CAUSE
Since there is a duplication of Major/Minor Number when asm is trying to mount a disk group it discovers two disks with same Major/minor number and there is no way asm can determine which one is the one it was using before dismount.
SQL> alter diskgroup DATA MOUNT;
alter diskgroup DATA MOUNT
*
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15024: discovered duplicately numbered ASM disk 4
After reboot if suddenly you get duplicate numbered ASM disk with serial number of disk it could be because of duplication of Major/Minor number whcih can be confirmed from
cat /proc/partitions and tallying it with o/p of ls -ltr /dev/sd*
[grid@stgrac1 lib]$ cat /proc/partitions
major minor #blocks name
8 0 156250000 sda
8 1 200781 sda1
8 2 30716280 sda2
8 3 8193150 sda3
8 4 0 sda4
8 5 4096543 sda5
8 6 113041341 sda6
8 16 262144 sdb
8 17 262114 sdb1
8 32 2588672 sdc
8 33 1270969 sdc1
8 34 1316756 sdc2
8 48 20480000 sdd
8 49 1001456 sdd1
8 50 1001472 sdd2
8 51 1001472 sdd3
8 81 0 sdd4<<<<<<<<<<<<<<<<<<<<
8 53 2000880 sdd5
8 54 2000880 sdd6
8 55 2000880 sdd7
8 64 262144 sde
8 65 262114 sde1
8 80 2785280 sdf
8 81 1003873 sdf1<<<<<<<<<<<<<<<<<<<<
8 82 1 sdf2
[grid@stgrac1 lib]$ ls -ltr /dev/sd*
brw-r----- 1 root disk 8, 0 Apr 5 18:35 /dev/sda
brw-r----- 1 root disk 8, 5 Apr 5 18:35 /dev/sda5
brw-r----- 1 root disk 8, 3 Apr 5 18:36 /dev/sda3
brw-r----- 1 root disk 8, 2 Apr 5 18:36 /dev/sda2
brw-r----- 1 root disk 8, 1 Apr 5 18:36 /dev/sda1
brw-r----- 1 root disk 8, 32 Apr 5 19:29 /dev/sdc
brw-r----- 1 root disk 8, 16 Apr 5 19:29 /dev/sdb
brw-r----- 1 root disk 8, 48 Apr 5 19:29 /dev/sdd
brw-r----- 1 root disk 8, 64 Apr 5 19:29 /dev/sde
brw-r----- 1 root disk 8, 80 Apr 5 19:29 /dev/sdf
brw-r----- 1 root disk 8, 49 Apr 5 19:29 /dev/sdd1
brw-r----- 1 root disk 8, 54 Apr 5 19:29 /dev/sdd6
brw-r----- 1 root disk 8, 50 Apr 5 19:29 /dev/sdd2
brw-r----- 1 root disk 8, 51 Apr 5 19:29 /dev/sdd3
brw-r----- 1 root disk 8, 53 Apr 5 19:29 /dev/sdd5
brw-r----- 1 root disk 8, 4 Apr 6 10:02 /dev/sda4
brw-r----- 1 root disk 8, 6 Apr 6 10:02 /dev/sda6
brw-r----- 1 root disk 8, 55 Apr 6 10:02 /dev/sdd7
brw-r----- 1 root disk 8, 81 Apr 6 10:02 /dev/sdd4<<<<<<<<<<<<<<<<<<<<
brw-r----- 1 root disk 8, 82 Apr 6 11:11 /dev/sdf2
brw-r----- 1 root disk 8, 65 Apr 8 00:33 /dev/sde1
brw-r----- 1 root disk 8, 34 Apr 8 00:33 /dev/sdc2
brw-r----- 1 root disk 8, 17 Apr 8 00:33 /dev/sdb1
brw-r----- 1 root disk 8, 33 Apr 8 00:33 /dev/sdc1
brw-r----- 1 root disk 8, 81 Apr 8 00:36 /dev/sdf1<<<<<<<<<<<<<<<<<<<<
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