RE: Critical disk usage amount -- MIDRANGE-L

Dave,

We stopped having space concerns a while ago; a couple of model upgrades
ago I included a bunch of DASD to get the ASP down in the <35% range.
But I didn't buy the disks for the space.  I bought them to get the arm
utilization down to something reasonable.

I would suggest that you examine the disk arm utilization / percent busy
to see if your disks are thrashing.  If their % busy is high (IIRC above
40% for internal disks), there is a performance bottleneck that's
causing the CPU to potentially sit idle while waiting for disk I/Os to
complete.  I would use that as part of an argument for additional and/or
faster arms.  

But if you can't buy more DASD and have to continue to clean up the
system:

1. Run a RTVDSKINF periodically and then PRTDSKINF to examine the
results.  I run them weekly here.  You may find objects that haven't
been used for months and be able to present a good argument from that
for archiving those items to tape.

2. If the developers do need their test data, I would question just how
much they need.  Perhaps their test files, which may be copies of
production data, can be pared down by deleting 90% of their contents.
Followed by a reorg and you might reclaim even more space.  This should
still leave sufficient data for most testing activities.

HTH,
John

-----Original Message-----
From: Dave Snyder [mailto:dsnyder@xxxxxxxxxx] 
Sent: Thursday, March 06, 2003 11:58 AM
To: midrange-l@xxxxxxxxxxxx
Subject: Critical disk usage amount


I am trying to convince people here that we need to add more disk to our
AS400. We currently have 256GIG and are at 74% utilization. What common
usage percentage do people use as a threshold that, if we go beyond this
percentage, there will be issues? We have cleared off as much as
possible but people constantly want more test information left on the
box, so we continue to grow every month. Thanks for the thoughts. Dave


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