Hello all,

I'm looking for an advice or hint with following situation:
On one TSM server I'm observing weird (pretty high) compression ratio on
most of tapes. I wonder if it is possible to replicate this "success" to
other TSM server(s) with same/similar configuration, but I'm clueless on
where to start.

Volume Name     Storage pool    Device Class    Estimated Capacity
Pct. Utilization        Status
CO0250L5        SPT_ORA DEVCLPR62       8.7 T   34.4    Full
CO0273L5        SPT_ORA DEVCLPR62       8.3 T   48.1    Full
CO0091L5        SPT_ORA DEVCLPR62       7.6 T   58.6    Full
CO0308L5        SPT_DB2 DEVCLPR62       7.1 T   60.4    Full
CO0316L5        SPT_DB2 DEVCLPR62       6.8 T   77      Full
CO0232L5        SPT_DB2 DEVCLPR62       6.5 T   64.7    Full
CO0056L5        SPT_DB2 DEVCLPR62       6.4 T   84.7    Full
CO0244L5        SPT_DB2 DEVCLPR62       6.4 T   81.3    Full
CO0026L5        SPT_DB2 DEVCLPR62       6.1 T   90.2    Full
CO0127L5        SPT_DB2 DEVCLPR62       6.0 T   38      Full
CO0325L5        SPT_SAP DEVCLPR62       6.0 T   61.9    Full
CO0061L5        SPT_DB2 DEVCLPR62       5.9 T   97.3    Full
CO0228L5        SPT_SAP DEVCLPR62       5.9 T   59.4    Full
CO0071L5        SPT_SAP DEVCLPR62       5.8 T   89.7    Full
CO0189L5        SPT_SAP DEVCLPR62       5.8 T   90      Full
CO0205L5        SPT_SAP DEVCLPR62       5.8 T   90.2    Full
CO0221L5        SPT_SAP DEVCLPR62       5.8 T   66.1    Full
CO0376L5        SPT_SAP DEVCLPR62       5.8 T   99.9    Full
CO0404L5        SPT_SAP DEVCLPR62       5.8 T   90.2    Full
CO0306L5        SPT_SAP DEVCLPR62       5.7 T   86.5    Full
CO0078L5        SPT_SAP DEVCLPR62       5.6 T   71.9    Full
CO0285L5        SPT_SAP DEVCLPR62       5.6 T   93.4    Full

Previous output is sorted by capacity, listed only Full tapes because for
those capacity is confirmed as real. Compression ratio is up to 5.8:1,
Stored data are Oracle/DB2/SAP Oracle, full backups and logs. One exception
is storage pool SPT_DB2 which holds backups of "directories" (someone
forgot to set up correctly DIRMC).
Tapes are created by "migration from disk stgpool" or by "clients directly
writing on tapes", there is no LAN-Free, compression is disabled on client
servers.
We use IBM TS1050 (ULT3580-TD5) tape drives in TS3500 library with mixed
firmware E6Q6 and  D8D4 attached via 8Gb/s TAN(SAN) network.

Any idea or suggestion is welcomed.

Thank you
M. Janosik