What are your device class settings for the 'LTO4CLASS' device class? `q
devcl LTO4CLASS f=d` might show that your device class configuration isn't
enabling compression at the moment.

It also depends completely upon the nature of the data being stored on tape
- already compressed data (e.g. media files) doesn't tend to compress again
well.

/David Mc
London, UK

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Lars-Erik Öhman
Sent: 27 August 2009 11:25
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] LTO4 and compression

Where do I enable compression for LTO4 tapes/drives in a 3584 library? The
tapes only fill up to 800 GB.

A00000L4                    TAPEPOOL1      LTO4CLASS       771.2 G     98.4
Full
A00001L4                    TAPEPOOL1      LTO4CLASS       783.7 G     96.6
Full
A00002L4                    TAPEPOOL1      LTO4CLASS       784.3 G     97.5
Full
A00015L4                    TAPEPOOL1      LTO4CLASS       795.8 G     99.8
Full
A00025L4                    TAPEPOOL1      LTO4CLASS       794.5 G     99.8
Full
A00011L4                    TAPEPOOL2      LTO4CLASS       804.2 G    100.0
Full
A00024L4                    TAPEPOOL2      LTO4CLASS       805.1 G    100.0
Full
A00003L4                    COPYPOOL1      LTO4CLASS       780.8 G     96.9
Full
A00018L4                    COPYPOOL1      LTO4CLASS       793.5 G     99.9
Full
A00027L4                    COPYPOOL1      LTO4CLASS       804.2 G    100.0
Full

Library 3584 L32 firmware version 8620
4 drives IBM ULT3580-TD4 fimware version 89B2

I have searched and not found any information how to enable compression.

/Larsa

Lars-Erik Öhman
IT Systems, servers and applications

Carnegie Investment Bank AB
Gustav Adolfstorg 18
103 38 Stockholm
tel. +46 8 58 86 88 14
www.carnegie.se<http://www.carnegie.se/>

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