[ADSM-L] How to figure collocation overhead

Subject:	[ADSM-L] How to figure collocation overhead
From:	"Evans, Bill" <bevans AT FHCRC DOT ORG>
To:	ADSM-L AT VM.MARIST DOT EDU
Date:	Thu, 15 Jan 2009 10:34:44 -0800

Is there a guide or rule of thumb for determining what collocation will
do to library space?  It is being considered for improving restore
speeds.

I'm backing up 80TB in 30 volumes(filespaces) on a solaris server.
Currently there is no collocation set, all data goes to a long-term
management class, single onsite and off-site tape pools, data churn
averages < 1TB/night.

Using a 650 slot L700 library, LTO3, TSM 5.5, AIX 5.3.  The library is
>80% full, so, I'm concerned that starting collocation for the volumes
will consume the rest of the library.  Each filespace collocation may
end up with one tape not full (or 30 in this case).  
Thanks, 
Bill Evans 
Research Computing Support 
FRED HUTCHINSON CANCER RESEARCH CENTER

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