Tommy, the following must be true for the situation in question:
1. the disk storage pool in question has CACHE turned on
2. COMPRESSION=YES is in effect for the client in question
3. COMPRESSALWAYS=NO is NOT in effect for the client in question
4. the file being backed up at the time of the error was growing as a result
of compression
The reason it is happening is because the above are all in effect and is
explained by the following partial description of the backup process:
1. when a file is to be backed up by the client, it provides the server with
an estimate of the amount of space required to store the file
2. when, because of compression, a file grows during the backup, the client
revises its estimate with the server and, when COMPRESSALWAYS=YES (the
default) is in effect, continues sending the file, still compressing it
3. when CACHE is "turned on" for the storage pool in question, the server
does not check the "CACHEd file space" for room based on the revised
estimate (even though it does so at the beginning - in step 1 above)
4. if the server does not find "actual free space" (not including cached
file space that COULD be freed to make room to store the file), the server
responds as indicated in your problem situation.
There are lots of ways to solve this problem, including using
COMPRESSALWAYS=NO or turning off COMPRESSION altogether (e.g.,
COMPRESSION=NO), or (just for the file in question) using (if supported by
the client platform/level) exclude.compression.
You can also turn off caching for the storage pool in question - does it
actually provide you any real benefit, anyway?
Regards,
Mark
-----Original Message-----
From: Tommy Templeton
To: ADSM-L AT VM.MARIST DOT EDU
Sent: 2/10/03 5:38 PM
Subject: Diskpool error
I got this error during one of my weekend backups. Is anyone else
familiar with diskpool errors like this? Thanks.
02/09/03 03:44:25 ANR0534W Transaction failed for session 184 for node
SP2MN5F0 (DB2/6000) - size estimate exceeded and server
is unable to obtain additional space in storage pool
DISKPOOL.
Tommy Templeton
Senior System Administrator
DFA-MMRS
601-359-3106
e-mail - templeton AT mmrs.state.ms DOT us
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