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I agree with Rob...

Sometimes 80% utilization is kinda hard to justify on a large system...

For example 80% utilization on a 2TB system would result in 400GB of empty
disk space....

Try and explain that to the manager who has to authorize the purchase. 

  "What... !!! " ... You mean to tell me the iSeries box won't run
   efficiently unless it has 400GB's of empty disk space available???"

I wouldn't think this is true. My guess is that the larger the total disk
space, the higher the total disk utilization can be before you begin to see
disk related performance issues. 

The 80% utilization figure was probably accurate for smaller system and just
might be a carry over from the Systemm/38 days when total system storage was
less that 100GB...

That's my 2 cents worth...

Kenneth

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


-----Original Message-----
From: rob@xxxxxxxxx [mailto:rob@xxxxxxxxx]
Sent: Friday, March 07, 2003 6:15 AM
To: Midrange Systems Technical Discussion
Subject: Re: Critical disk usage amount


You have to be careful of generalizations.  I still think 80% of disk 
space is a good idea.  Not only performance, but the slothness of decision 
making may cause problems if you wait until much higher than that.  As 
soon as you get more, get back into STRSST and lower your threshold.

Back to generalizations...  If you base performance strictly on the 80% 
full you'll have problems.  There may be a difference between someone at 
80% full with 200 disk drives and someone at 80% full and 4 disk drives.

Rob Berendt
-- 
"They that can give up essential liberty to obtain a little temporary 
safety deserve neither liberty nor safety." 
Benjamin Franklin 
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