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
