ADSM-L

Client backup to 3590 tape directly

1998-09-28 01:56:43
Subject: Client backup to 3590 tape directly
From: Eric Tang <tangeric AT HK1.IBM DOT COM>
Date: Mon, 28 Sep 1998 13:56:43 +0800
Dear All,

I have a few questions regarding Unix ADSM client backup (& oracle db by
sql-backtrack or RMAN+ADSMConnectAgent) directly to 3590 tape
(collocation=yes), in particular how does ADSM handle the backup at
end-of-tape?

Eg, If a 1GB file is to be backed up and there is a tape with status
"filling" (only 100MB capacity left) & many scratch tape, will
i) ADSM split the file into 2, the first 100MB to the "filling" tape and
the rest to a scratch? Or
ii) Firstly, ADSM determines 100MB is not enough and mounts a scratch right
at the beginning?  Or
iii) other mechanism

If ii) is the answer, question:
a)  how does adsm determine filesize if client compression is on?
b) for RMAN/ConnectAgent, there is environment variable DSMO_AVG_SIZE to
tell ADSM the filesize, is there a similar parameter in SQL-Backtrack?

Thank you

Regards,
Eric Tang / Hong Kong / IBM  @ IBMHK
Technical Services, Strategic Outsourcing,
IBM Greater China Group
Tel: (852)-2105-2119,   Fax: (852)-2861-2493
Notes: Eric KF Tang/Hong Kong/IBM@IBMHK
Internet : tangeric@ hk1.ibm.com
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