• Subject: RE: 98% ASP Utilization ???
  • From: "Graap, Ken" <keg@xxxxxxxxxxxxxxxxxx>
  • Date: Fri, 5 Nov 1999 08:05:10 -0800

We had a similar problem on our S20 system... In our case it looked like it
might have been related to using compressed disk. Apparently when using
compressed disk an additional 33% of disk space is reserved in case the
object being written is immediately read. This additional space is reserved
for recompressing. After a disk arm is idle for 15 seconds though microcode
tasks run that reclaim this space. 

We ran out of DASD in our user defined ASP because we were sending so much
data to the disk (we were running a backup) that there was no disk arm idle
time... The system locked up on an SRC indicating the ASP was full when
WRKDSKSTS was showing that the ASP was only 66% utilized! It took an IPL to
recover.

IBM is aware of this problem and has basically told me that this is how it
is suppose to work!

Needless to say, we are no longer using the S20 to support network
backups....

Kenneth

****************************************
Kenneth E. Graap
IBM Certified Specialist
AS/400 Professional
Systems Administrator
NW Natural (Gas Services)
keg@nwnatural.com
Phone: 503-226-4211 x5537
FAX:    603-849-0591
****************************************



-----Original Message-----
From: Ray Peterson [mailto:rpeterso@witc.tec.wi.us]
Sent: Thursday, November 04, 1999 5:44 PM
To: MIDRANGE-L@midrange.com
Subject: Re: 98% ASP Utilisation ???


And to us on a 53S with V4R4!  We've been having some bigtime SMTP-Domino
problems which we thought were involved.  Got Rochester on the system with
our
Domino guy and did apply some PTF's.  We looked but could not find any
large
objects on the system that did not belong there.  A subsequent IPL got us
back to
76% which seemed close to where we should have been.  It was strange when it
happened, and it's even stranger that it seems to be not isolated!

Of course, with netserver, NT on "whatever it's called today", etc,,
couldn't any
user can "drag-n-drop" his 30GB "D" drive into a "share" on the /400...if
you
give him the needed permissions.  Or even worse scenerio's if you give them
unneeded permissions.

Ray

Roger Pence wrote:

> This very thing happened this week to my V4R4 Model 170! Except I wasn't
> running any month-end jobs. My 400 wasn't doing anything (of mine)!
>
> I got an alert at 90% utilitization and could literally press F5 on the
> WRKDSKSTS command and see my disk go away. Before I could figure anything
> out, it maxed out and blew up!
>
> After it's emergency IPL, my disk utilitization was about 84%. What
gives?!
>
> rp
>
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--
Ray Peterson
WITC - Shell Lake
505 Pine Ridge Drive
Shell Lake  WI  54871
www.witc.tec.wi.us
715 468-2815


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