ADSM-L

Re: Tape Relaimation question

1996-12-19 13:29:14
Subject: Re: Tape Relaimation question
From: "Wayne T. Smith" <wts AT MAIL.CAPS.MAINE DOT EDU>
Date: Thu, 19 Dec 1996 13:29:14 -0500
Tom Denier wrote..
> The only way I can think of to get this effect is to suppress ADSM's
> reclaim processeing entirely, query the old tape pool every so often,
> and run MOVE DATA commands against tapes that are sufficiently close
> to being empty. The MOVE DATA command can specify an output storage
> pool different from the input storage pool. Unfortunately, automating
> this process would be rather messy. For one thing, the MOVE DATA
> command normally prompts for interactive input. For another thing,
> the MOVE DATA command finishes execution almost immediately but leaves
> behind a background process that ties up two tape drives for a
> significant period.

For the VM server, one can issue the MOVE DATA via the REPLYOP
interface (CP SMSG DSMSERV MOVE DATA...) to get around the prompt
problem.  We do this "reclaim" back to a disk storage pool as it (1)
normally requires only one tape mount and (2) helps keep filesystem
data on a minimum number of tapes for non-collocated pools.

holiday cheers,


Wayne T. Smith               mailto:wts AT maine.maine DOT edu
Systems Group -- CAPS        University of Maine System
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