Tape compression ratios aren't so much dependent on server configuration as
incoming data. If you have incoming data that's similarly compressible I
would expect the compression ratios to be similar on the other servers.
FWIW, I've gotten upwards of 20TB on LTO6, before our researchers realized
they could compress genomic data (all text, only half-dozen characters)
really really well client-side...
On Wed, Jan 06, 2016 at 09:12:40PM +0100, Martin Janosik wrote:
> 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
--
-- Skylar Thompson (skylar2 AT u.washington DOT edu)
-- Genome Sciences Department, System Administrator
-- Foege Building S046, (206)-685-7354
-- University of Washington School of Medicine
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