Now I'm really confused.

Luanne, here's what the documentation for updating the stgpool reclamation
threshhold says.  I'll leave it to you to do the interpretation yourself.
One of the reasons we chose to restrict reclamation processing to the
weekends is because it uses up a great deal of CPU cycles and we don't have
many to spare during production hours.

RECLAIM=reclaimvalue

     Specifies when to initiate reclamation of fragmented space on volumes
in
the storage pool, based on the percentage of reclaimable space on a
volume.
Reclamation makes the fragmented space usable again by moving any
remaining
active files from one volume to another volume, thus making the original
volume
available for reuse.  This parameter is optional.  You can specify an
integer
from 1-100, inclusive.



     Space becomes fragmented as files on a volume are deleted because
of
processes such as expiration or file space deletion.  The amount of space
that
can be reclaimed on a volume increases as files on the volume are
deleted.
When the percentage of space that can be reclaimed on a volume rises above
the
value for the RECLAIM parameter, the volume is reclaimed.  Active files on
the
volume are rewritten to other volumes in the storage pool, making the
original
volume available for new
files.


     It is recommended that you specify a value of 50 percent or greater
for
this parameter so that files stored on two volumes can be combined onto
a
single output
volume.






ADSM-L AT VM.MARIST DOT EDU on 06/15/99 12:47:05 AM
Please respond to ADSM-L AT VM.MARIST DOT EDU @ INTERNET
To: ADSM-L AT VM.MARIST DOT EDU @ INTERNET
cc:
Subject: Re: reclamation

wait, the higher the reclamation value the more 'free' space on the tape.
So a reclamation value of 10% would mean that the tape would have to be
about 90% full of data or less to be reclaimed.
I usually wait until the reclaim percentage gets above 70 before I start.
With 3 tapes at 70% or higher I can reclaim them all onto 1 tape
(30+30+30=90) thus freeing up 2 tapes.

Mark


> -----Original Message-----
> From: Moir,Betsy [SMTP:betsy.moir AT ABBOTT DOT COM]
> Sent: Tuesday, June 15, 1999 1:31 PM
> To:   ADSM-L AT VM.MARIST DOT EDU
> Subject:      Re: reclamation
>
> I read it to mean that when at least 10% of the data on the volume is
> reclaimable, reclaim the volume.
>
> In your scenario, though, the 90% wouldn't necessarily be empty it would
> just
> be filled with dead data - data that has been removed from the database
> because it has been deleted or aged past the time it was to be kept.
>
> My understanding of the purpose of reclamation (and believe me, IBM's way
> of
> looking at these percentage things is about as confusing as I can imagine)
> was to delete the actual data of the files that had already been removed
> from
> the database for whatever reason.
>
> Feel free to correct me if I'm wrong.  The one thing I know for sure is
> that
> when we drop the reclamation threshold to 10%, reclamation processes start
> up
> almost immediately.
>
> Luanne - I hope I'm not giving you false information.  My bet would be
> with
> Kelly, though,  since he's waaaaaaaaaay more experienced in and
> knowledgable
> about  the workings of ADSM than I am.
>
>
>
>
>
> ADSM-L AT VM.MARIST DOT EDU on 06/15/99 11:32:51 AM
> Please respond to lipp AT storsol DOT com @ INTERNET
> To: ADSM-L AT VM.MARIST DOT EDU @ INTERNET
> cc:
> Subject: Re: reclamation
>
> 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
>
>
>