Greetings,
We are running TSM 5.4.3.0 server on AIX 5.3
We have a situation where our disk storage pools are becoming 70%
full in the middle of the night, which kicks off the automatic migration
cycle. Last night it happened at about 01:00. But a couple hours
later, while migration was still running, we had a few backup clients
fail because of this error:
07/16/08 03:18:16 ANR0534W Transaction failed for session 10529 for
node
PMMREPORTING (SQLsafe) - size estimate exceeded
and
server is unable to obtain additional space in
storage
pool T1DISK00. (SESSION: 10529)
Apparently there was not enough contiguous storage in the storage pool
to fit the large file in this transaction. Fair enough. But this
storage pool is configured to migrate into a tape storage pool, and
indeed migration was running. I thought that in this case TSM would
mount a tape for this session to write to, and not cause it to fail.
Why didn't TSM mount a tape in the next storage pool? We know there
were tape drives available. Here is the description of the storage
pool:
Storage Pool Name: T1DISK00
Storage Pool Type: Primary
Device Class Name: DISK
Estimated Capacity: 1,263 G
Space Trigger Util: 10.9
Pct Util: 10.9
Pct Migr: 10.2
Pct Logical: 100.0
High Mig Pct: 70
Low Mig Pct: 10
Migration Delay: 1
Migration Continue: Yes
Migration Processes: 1
Reclamation Processes:
Next Storage Pool: SUN2079-POOL1
Reclaim Storage Pool:
Maximum Size Threshold: No Limit
Access: Read/Write
Description: Tier 1 Random Storage
Overflow Location:
Cache Migrated Files?: No
Collocate?:
Reclamation Threshold:
Offsite Reclamation Limit:
Maximum Scratch Volumes Allowed:
Number of Scratch Volumes Used:
Delay Period for Volume Reuse:
Migration in Progress?: No
Amount Migrated (MB): 1,181,053.02
Elapsed Migration Time (seconds): 26,336
Reclamation in Progress?:
Last Update by (administrator): SCHNJD
Last Update Date/Time: 05/22/08 11:31:59
Storage Pool Data Format: Native
Copy Storage Pool(s):
Active Data Pool(s):
Continue Copy on Error?: Yes
CRC Data: No
Reclamation Type:
Overwrite Data when Deleted:
We may begin working on getting more disk storage pool, or changing the
backup times so migration doesn't hit the disk so much, but that is not
the question I am asking. I want the storage pools to operate as a
hierarchy.
Best Regards,
John D. Schneider
Lead Systems Administrator - Storage
Sisters of Mercy Health Systems
3637 South Geyer Road
St. Louis, MO 63127
Phone: 314-364-3150
Cell: 314-750-8721
Email: John.Schneider AT Mercy DOT net
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