What have you totalled - sum(capacity) or sum(capacity * pct_util / 100) ?
Latter will give you the ammount of data while former will give you the
space in filesystems (occupied and non-occupied). Also take into account
that not all the data may be backed up - you can exclude some files.
And an example on the end:
100 GB filesystem with 20 Oracle data files 4 GB each will give 80 GB
occupied and 20 GB empty space.
Later data files are excluded from B/A client and Oracle tablespaces being
say 66% utilized will give approx. 53 GB of backups.
And if you have client compression say 2.4:1 will have this data occupying
only 22 GB.
etc., etc. ...

Zlatko Krastev
IT Consultant




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Subject:        Data inconsistencies

Hello TSMers,

I have a mystery here I need help clearing up.

I ran these commands...

SELECT NODE_NAME, FILESPACE_NAME, capacity, PCT_UTIL, BACKUP_START,
BACKUP_END FROM FILESPACES  and
I send the output of this command through some REXX code to total the
amount
of data(capacity) backed up.  The result is 13 terabytes.

SELECT VOLUME_NAME FROM VOLUMEUSAGE