Impossible to drop the disc?

env: 11.2.0.2.3

I have a redundancy normal diskgroup (asm/RDBMS compatibility set to 11.2.0.0) containing two discs, it's everyone in own failgroup.
I've tested the disk_repair_time attribute and took one of the disks in the group offline and waited until the expiration of the timer - to see if the disc - Oracle and test how I can recover from this situation if the drive was missing.

Then I took the LOG2 drive off line and waited...

ASM alerts log, I see:
Fri Sep 09 09:59:21 2011
WARNING: Disk (LOG2) will be dropped in: (168) secs on ASM inst: (1)
Fri Sep 09 10:00:55 2011
WARNING: Disk (LOG2) will be dropped in: (74) secs on ASM inst: (1)
Fri Sep 09 10:02:27 2011
WARNING: PST-initiated drop of 1 disk(s) in group 3(.467124207))
SQL> alter diskgroup LOG drop disk LOG2 force /* ASM SERVER */
NOTE: GroupBlock outside rolling migration privileged region
NOTE: requesting all-instance membership refresh for group=3
Fri Sep 09 10:02:29 2011
GMON updating for reconfiguration, group 3 at 30 for pid 33, osid 13932
NOTE: group LOG: updated PST location: disk 0000 (PST copy 0)
NOTE: group 3 PST updated.
Fri Sep 09 10:02:29 2011
NOTE: membership refresh pending for group 3/0x1bd7bfef (LOG)
GMON querying group 3 at 31 for pid 18, osid 10302
SUCCESS: refreshed membership for 3/0x1bd7bfef (LOG)
SUCCESS: alter diskgroup LOG drop disk LOG2 force /* ASM SERVER */
SUCCESS: PST-initiated drop disk in group 3(467124207))
NOTE: Attempting voting file refresh on diskgroup LOG
NOTE: starting rebalance of group 3/0x1bd7bfef (LOG) at power 1
Starting background process ARB0
Fri Sep 09 10:02:34 2011
ARB0 started with pid=37, OS id=14883
NOTE: assigning ARB0 to group 3/0x1bd7bfef (LOG) with 1 parallel I/O
Fri Sep 09 10:02:40 2011
NOTE: GroupBlock outside rolling migration privileged region
NOTE: requesting all-instance membership refresh for group=3
Fri Sep 09 10:02:40 2011
NOTE: stopping process ARB0
SUCCESS: rebalance completed for group 3/0x1bd7bfef (LOG)
Fri Sep 09 10:02:43 2011
GMON updating for reconfiguration, group 3 at 32 for pid 38, osid 14888
NOTE: group LOG: updated PST location: disk 0000 (PST copy 0)
NOTE: group 3 PST updated.
WARNING: offline disk number 1 has references (904 AUs)
NOTE: membership refresh pending for group 3/0x1bd7bfef (LOG)
GMON querying group 3 at 33 for pid 18, osid 10302
SUCCESS: refreshed membership for 3/0x1bd7bfef (LOG)
NOTE: Attempting voting file refresh on diskgroup LOG
And from RDBMS alerts journal:
Fri Sep 09 10:02:32 2011
SUCCESS: disk LOG2 (1.2526490858) renamed to _DROPPED_0001_LOG in diskgroup LOG
OK, check in asm v$ asm_disk:
SYS@+ASM1 SQL>r
  1  select a.name "GroupName", a.state "GroupState",b.name,b.mount_status,b.header_status,b.mode_status,b.state "DiskState",b.repair_timer
  2  from v$asm_diskgroup a,v$asm_disk b
  3  where a.group_number = b.group_number
  4* order by a.name,b.name

GroupName                      GroupState  NAME                           MOUNT_S HEADER_STATU MODE_ST DiskStat REPAIR_TIMER
------------------------------ ----------- ------------------------------ ------- ------------ ------- -------- ------------
DATA                           MOUNTED     DATA1                          CACHED  MEMBER       ONLINE  NORMAL              0
DATA                           MOUNTED     DATA2                          CACHED  MEMBER       ONLINE  NORMAL              0
GRID                           MOUNTED     GRID3                          CACHED  MEMBER       ONLINE  NORMAL              0
GRID                           MOUNTED     GRID4                          CACHED  MEMBER       ONLINE  NORMAL              0
GRID                           MOUNTED     GRID_0001                      CACHED  MEMBER       ONLINE  NORMAL              0
LOG                            MOUNTED     LOG1                           CACHED  MEMBER       ONLINE  NORMAL              0
LOG                            MOUNTED     _DROPPED_0001_LOG              MISSING UNKNOWN      OFFLINE FORCING             0

7 rows selected.


SYS@+ASM1 SQL>select * from v$asm_operation;

no rows selected
So, why the disc always showing to v$ asm_disk if it fell? Or is it? I thought that Oracle should drop the disc at the expiration of the timer of the repair, but then why I always see it? I want to add the failed drive to return once again... How can I realize that, if the drive is still a member of the diskgroup of the NEWSPAPER?

Thank you..

Published by: AJ on 09.sep.2011 01:17

Hello

the reason behind this, is that a DISC will get status COWARD, if all valid content could be moved to another drive.
However, in your case your LOG diskgroup consisted only of 2 discs (and 2 failgroups). So when access to a failgroup had disappeared, the whole failgroup was set to offline.
Now when the repair timer expires the disks to be abandoned. However, it cannot be moved, because the data on the disk can not be moved to other disks.
So what happens, is that your discs will be defined in the sense of "FORCING", as soon as the data can be rebalanced to another drive (maybe when you add a new drive), the drive really will be abandoned.

Concerning
Sebastian

Tags: Database

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