nope- on a win-nt admin gui under storage pool volumes there is a percent
reclaimable, that tells you how much of the data on your tape is useless
data to be reclaimed.  The percent utilized is good data.  Remember a tape
is sequential storage device.  Using your 10% -90% argument, if 10%  is
"percent utilized", that does not mean that 90% is empty.  You need to look
at the percent utilized say 10% and the percent reclaimable say 30%.  that
means that 40% percent of the tape has been written to, and 60 percent is
empty.  Of that 40 percent 30 percent is junk to be reclaimed.

So when you set your reclaimation threshold (say 60%) the tape will start
reclaiming when percent reclaimable this that number (60%)


At 09:51 AM 06/15/1999 -0600, you wrote:
>I thought the reclamation percentage meant the amount of useful data left on
>the tape.  So 10% means there is only 10% of the tape that has valid data,
>or in other words, 90% of the tape is empty.
>
>Kelly J. Lipp
>Storage Solutions Specialists, Inc.
>PO Box 51313
>Colorado Springs CO 80949
>719-531-5926
>www.storsol.com
>lipp AT storsol DOT com
>
>-----Original Message-----
>From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
>Moir,Betsy
>Sent: Tuesday, June 15, 1999 7:09 AM
>To: ADSM-L AT VM.MARIST DOT EDU
>Subject: Re: reclamation
>
>
>Basically, as data becomes old or expired or deleted it is marked for
>reclamation,  and when ADSM reclaims tapes (it's sort of a merge/purge
>process), the "active" files on a tape are moved to another tape and the old
>tape is returned to the scratch pool.  This reclamation process is
>determined
>by a reclamation threshhold that is set in the stgpool definition - REC=999.
>
>To automate the reclamation process, we drop our reclamation threshhold on
>the weekend to rec=10 with an admin schedule.
>
>Define sched schedname type=admin cmd=Update stgpool stgpoolname rec=10.
>
>The reclamation threshold indicates how much reclaimable space a volume must
>have before ADSM reclaims the volume.  When it's set to 10, only 10% of a
>volume has to be expired, deleted or aged files.  We return the reclamation
>threshold to rec=100 during the week so that no reclamation takes place.
>
>More information about how to set up admin schedules and what levels
>reclamation thresholds should be set at can be found in the Admin Guide.
>
>Hope this helps.
>
>
>
>
>ADSM-L AT VM.MARIST DOT EDU on 06/15/99 07:50:48 AM
>Please respond to ADSM-L AT VM.MARIST DOT EDU @ INTERNET
>To: ADSM-L AT VM.MARIST DOT EDU @ INTERNET
>cc:
>Subject: reclamation
>
>Hi!
>        Just wondering if anyone can help me with reclamation, understanding
>what it is and how I can automate this?  All help is greatly appreciated.
>Thanks.
>
>Luanne R. Hancock
>J.D. Edwards
>303-334-4843 office
>303-334-4716 fax
>luanne_hancock AT jdedwards DOT com

Dan Thurston
Research Programmer
1714 Beckman Institute
405 N. Mathews Avenue
Urbana, IL 61801
(217) 244-9625