Well -- I get a compression ratio of 1.26 from backint on a 554 GB Oracle
database, and then manage to get around 102 GB per tape on Quantum DLT-7000
drives on the 35/70 GB tapes. So the Quantum drives, at least, are getting
about a 3:1 compression *after* the 25% compression from backint.
I'm not sure what you'll see on the 3590 drives, but it should be somewhere
in the same area.
Tom Kauffman
NIBCO, Inc.
-----Original Message-----
From: Malbrough, Demetrius [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, February 13, 2001 12:54 PM
To: [EMAIL PROTECTED]
Subject: TDP for SAP R/3 compression vs. TAPE DRIVE compression
Good Afternoon, *SMers & SAPsters!
I wanted to see if I could pick your brains for a second!
What happens if you are performing null block compression before sending the
data over the network to the TSM server (RL_COMPRESSION YES in the SAP R/3
profile) and also using Tape Drive compression (3494 ATL w/ 3590 drives on
Solaris FORMAT=3590C via device=/dev/rmt/#stc)? Will the data grow due to
being compressed twice or compression on the SAP R/3 side is so simple it
does not affect Tape Drive compression?
Thanks,
Demetrius A. Malbrough
ADSM/TSM Consultant
Texas Instruments
6550 Chase Oaks Blvd.
Plano, TX 75023
(972) 927-9869 Office
(214) 314-3350 Pager
[EMAIL PROTECTED]
