Re: Expiration processing
1995-10-27 09:37:58
Tim Pittson asks:
> We're running Version 1 of ADSM on an MVS system. I've got expiration
> processing set up to run once a day (EXPIN 24). Our database is 4 GB
(soon
> to be 5) and I'm seeing expiration processing running 6-8 hours a day
using
> 60-80% of a processor on a 3090-500J.. Was just curious what other
medium
> to large ADSM users were seeing as far as run times for expiration
> processing goes. Have any improvements been made in ADSM version 2 ??
Is
> there anything I can do to speed it up ??? Was also considering changing
> this to a weekly or twice a week process instead of daily.
> Comments/suggestions appreciated.
I run inventory expiration once a day. I have EXPINTERVAL set to 0 and
an administrative command scheduled to run inventory expiration once a day
at 5:00 AM. I do it this way, as opposed to using "EXPINTERVAL 24" so
that *I* can control when it starts, as opposed to the interval being
offset from when the ADSM server is started. I also schedule changes to
the tape pool reclamation settings (from 100 to 80 and back to 100) so
that I can control when reclamation starts and stops. Doing this gives
me the added benefit of suppressing reclamation when inventory expiration
is running, which I find desirable. This is because as the process is
running, a tape may dip below the reclamation threshold. At that time,
ADSM will start the reclamation process. However, it is possible that the
inventory expiration will eventually expire *all* data on the tape, making
reclamation unnecessary and a waste of resources.
My database is 1,548 MB in size. Utilization is at 72%.
The following illustrates the results of inventory expiration for the
past three days:
Start Time End Time Files expired Tapes deleted
========== ======== ============= =============
05:00 06:27 21,731 57
05:00 06:49 38,949 22
05:00 06:29 25,331 85
It's interesting to note that there appears to be no correlation between
the number of tapes that expire and the number of files deleted, although
this is a very small sample and may be statistically insignificant.
I don't know if the above info helps, but I thought I'd give you a picture
of what our shop is doing. Overall I find it useful to run expiration
daily.
Andy Raibeck
Connecticut Mutual
203-987-3521
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