Wayne,
Starting at server 4.2 (or maybe 4.1.something), there is a RECONSTRUCT
parm you can add to MOVE DATA to get the aggregates rebuilt along the
way!  (RECONSTRUCT=NO is still the default).

I haven't done any timings on it, though, to see if it's slower.

Wanda



-----Original Message-----
From: Wayne T. Smith
To: ADSM-L AT VM.MARIST DOT EDU
Sent: 9/4/2002 11:33 AM
Subject: Re: multiple reclaim processes

Two quick (and probably obvious) points:

- You can do multiple simultaneous reclamations if you have multiple
storage pools.  Long on tape drives?  Create another domain (& storage
pool(s)) and split your nodes between them.

- MOVE DATA (tape to tape, or tape back to disk) allows multiple
simultaneous processes on one storage pool and each is often faster than
  the corresponding reclamation.  The down-side to MOVE DATA is that
aggregates are not reconstructed, so your newly filled tape will
immediately have reclaimable space.  Perhaps a statistician could tell
us the expected wasted space remaining after a MOVE DATA.  Maybe with
too many caveats to be useful, ... but when I switched from exclusively
performing MOVE DATAs to exclusively performing reclamation, I "gained"
almost 20% empty volumes.

cheers, wayne

Wayne T. Smith, ADSM AT Maine DOT edu, University of Maine System