Applies to:

Oracle Server - Enterprise Edition - Version: 10.2.0.1 to 11.2.0.2 - Release: 10.2 to 11.2
Information in this document applies to any platform.

Symptoms

V$ASM_DISK view shows some disk header status as IGNORED and group number as "0".

Cause

This is not a mormal situation but can happen in the following senario.

1. If there are more than 2 disks dropped forcefully from the same diskgroup created with normal redundancy while the diskgroup is still mounted, these disks still show "MEMBER" and group number as "0". If a new disk is added to the diskgroup or existing disks are added in different order, there is a possibility that the same disk number and disk name can be assigned to the ones that was assigned to one of dropped disks which has not been added yet.

This situation can happen either when one of SAN failgroup crash or when one of cell node from Exadata crash.

2. In RAC environment, ASM disk added to a existing diskgroup should be seen from all nodes. If one of nodes doesn't see the disk being added, the operation will fail with "ORA-15075 disk(s) are not visible cluster-wide" but the disk being added keeps the new disk number and disk name showing "MEMBER" status. After this, a new disk is added to the RAC node successfully, chances are the new disk gets the same disk number and diskname with the one that was failed in the first place.

The following similar error occurs when these disks showing IGNORED status are attempted to be added an existing diskgroup.

SQL> alter diskgroup data add failgroup F2 disk '/dev/oracleasm/disks/ASM1' ;
alter diskgroup data add failgroup F2 disk '/dev/oracleasm/disks/ASM1'
*
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15033: disk '/dev/oracleasm/disks/ASM1' belongs to diskgroup "DATA"

Solution

IGNORED status can be seen for ASM disks which are not part of any currently mounted diskgroup but it shows the same disk header information with one of disks that are currently mounted such as disk number, disk name and diskgroup and the status as "MEMBER" and group number as "0".

Please see how to check whether there are at last 2 ASM disks showing the same disk header information in Appendix 1 below using kfed.

1. When the diskgroup from which the disk has been dropped is currently mounted, try to add the disk showing "IGNORED" status using force option to the original diskgroup from which the disk has been dropped. Please see Document:946213.1 - for details how to add a disk back to the original diskgroup.

Example)

SQL> alter diskgroup data add failgroup F2 disk '/dev/oracleasm/disks/ASM1' force ;
Diskgroup altered

2. When the diskgroup from which the disk has been dropped is not currrently mounted, v$asm_disk shows the correct disk as MEMBER by comparing creation time from disk directory . If a disk showing the same disk number and has a different creation time from disk directory, the status is seen as IGNORED.

example) ASM1 and ASM2 show the same disk header information from kfed output.

SQL>@diskifno
G_N D_N NAME FAILGROUP M_STATU H_STATUS MO_STAT STATE PATH M_DATE
---- ---- ----------- ---------- ------- ---------- ------- -------- ------------------------- --------------------
0 0 CLOSED MEMBER ONLINE NORMAL /dev/oracleasm/disks/ASM2 2011/02/25 21:07:49
0 1 IGNORED MEMBER ONLINE NORMAL /dev/oracleasm/disks/ASM1 2011/02/25 18:08:43
0 2 CLOSED MEMBER ONLINE NORMAL /dev/oracleasm/disks/ASM4 2011/02/25 20:59:01
0 3 CLOSED MEMBER ONLINE NORMAL /dev/oracleasm/disks/ASM3 2011/02/25 21:07:49
1 0 PLAY_0000 PLAY_0000 CACHED MEMBER ONLINE NORMAL /dev/oracleasm/disks/ASM5 2011/02/20 20:52:31
3 0 KYLE_0000 KYLE_0000 CACHED MEMBER ONLINE NORMAL /dev/oracleasm/disks/ASM6 2011/02/20 20:52:44

2-1. ASM discards the disk showing IGNORED status automatically by comparing creation time from disk directory when mounting DATA diskgroup.

SQL> alter diskgroup data mount ;
Diskgroup altered.

Please note that ASM1 has been excluded from DATA diskgroup.

SQL> @diskinfo

G_N D_N NAME FAILGROUP M_STATU H_STATUS MO_STAT STATE PATH M_DATE
---- ---- ----------- ---------- ------- ---------- ------- -------- ------------------------- --------------------
0 1 IGNORED MEMBER ONLINE NORMAL /dev/oracleasm/disks/ASM1 2011/02/25 18:08:43
1 0 PLAY_0000 PLAY_0000 CACHED MEMBER ONLINE NORMAL /dev/oracleasm/disks/ASM5 2011/02/20 20:52:31
2 0 DATA_0000 F1 CACHED MEMBER ONLINE NORMAL /dev/oracleasm/disks/ASM2 2011/02/25 21:09:47
2 1 DATA_0001 F2 CACHED MEMBER ONLINE NORMAL /dev/oracleasm/disks/ASM4 2011/02/25 21:09:47
2 2 DATA_0002 F2 CACHED MEMBER ONLINE NORMAL /dev/oracleasm/disks/ASM3 2011/02/25 21:09:47
3 0 KYLE_0000 KYLE_0000 CACHED MEMBER ONLINE NORMAL /dev/oracleasm/disks/ASM6 2011/02/20 20:52:44

2-2. And then the disk showing IGNORED can be added using step 1.

Appendix
1. How to check whether there are duplication disks showing the same disk header information.
- Check whether kfed executable exist in your

- Rebuild if kfed executable doesn't exist using the following way.
$cd $ORACLE_HOME/rdbms/lib
$make -f ins_rdbms.mk ikfed

- Take a kfed output for the disks. If the following information of the header is the same, the 2 disks are considered to be the same.
Please note mntstmp.hi and mntstmp.lo (disk mount time) can be different to be the same disk in this excercise.
ex) $ kfed read /dev/oracleasm/disks/ASM1 | egrep 'dsknum|dskname|grpname|fgname|hdrsts|mntstmp.hi|mntstmp.lo'

References

NOTE:946213.1 - How To Add Back An ASM Disk or Failgroup (Normal or High Redundancy) After A Transient Failure Occurred (11.1 & 10.2) Or When The DISK_REPAIR_TIME Attribute Expired (10.1 & 11.2)?

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V$ASM_DISK show some disk status ‘IGNORED’ & group number ‘0".

Applies to:

Symptoms

Cause

Solution

References

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