Richard,
 
Your database has an allocated disk size of 300 GB, but RMAN takes only the 
backup of effective data in it. That explains why the disk consumption in the 
disk storage pool is less than 300 GB. 
 
Check once in an OEM the usage of the tablespaces. This should match better to 
the size in the disk storage pool.
 
best regards,
Kurt

________________________________

Van: ADSM: Dist Stor Manager namens Richard Mochnaczewski
Verzonden: ma 1/30/2006 19:30
Aan: ADSM-L AT VM.MARIST DOT EDU
Onderwerp: [ADSM-L] Oracle RMAN and TSM



Hi Everybody,

I have a dedicated disk pool for one specific Oracle RMAN backup using 8 
channels of a database at 300Gb. The backup takes about 2 hours, but if I clean 
the cache on the pool, I will see no storage space usage until the channel 
session has ended. So, at the end of the backup, the storage pool usage will go 
from 0% to about 66%. My storage pool size is 310Gb and I don't enable 
compression. Two questions :

1) What is TSM doing with each channel's data being sent ? Is it buffering it 
somehow ?
2) Because my database is abouot 300Gb, why does the storage pool show 66% 
usage ? Shoudldn't it be more ?

Rich