If you have sufficient memory, make sure the "Intelligent Cache" is activated. (Paging Option *CALC for storage pools - F11 from WRKSYSSTS or from WRKSHRPOOL). Neil Palmer DPS Data Processing Services Canada Ltd. 50 Acadia Avenue, Ste.102 AS/400~~~~~ Markham, Ontario, Canada. ____________ ___ ~ Phone:(905) 474-4890 x303 |OOOOOOOOOO| ________ o|__||= Cell.:(416) 565-1682 x303 |__________|_|______|_|______) Fax: (905) 474-4898 oo oo oo oo OOOo=o\ mailto:NeilP@DPSlink.com ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ http://www.DPSlink.com iSeries 400 The Ultimate Business Server Larry Bolhuis <email@example.com> Sent by: firstname.lastname@example.org 2001/01/18 07:57 Please respond to MIDRANGE-L To: MIDRANGE-L@midrange.com cc: Subject: Re: Are these 8 gigabyte drives causing a problem? Yes. These drives are too busy! Anything over 40% for a 5 minute interval as you have displayed, and the system (and it's users) 'will notice'. As to what to do now, Several options (not all good ones): 1) Stop running so many jobs. (see I told you they weren't all good) 2) Add memory. This may not help at all of the disk I/O is pure DB. It may help a lot if the machine is swapping. 3) Add Drives. More is better, never too many. With the numbers below you're likely to need up to 4 more drives to get performance where it should be. Also you are over the 80% reccomended DASD upgrade line anyway so another 34G (4 drives) wouldn't hurt that in the least either. 4) Is it possible the machine is filling the write cache on the controller? You yourself have expressed in the past that this is a bad thing. More drives wouldn't likely help that much unless you set them up mirrored instead of RAID. Hope this helps! - Larry Charly Jones wrote: > > I have been looking at the performance of this machine for the last > few hours. Something is wrong. I think it might be that the 8 > gigabyte drives have enough storage space, but not enough arms. Is 64 > percent busy a big number? > > What do I do now? > > Charly Jones CSP > > Geezer in Gig Harbor > > Work with Disk > Status KHUMBA > 01/17/01 > 10:31:57 > Elapsed time: 00:05:01 > > Size % I/O Request Read Write Read > Write % > Unit Type (M) Used Rqs Size (K) Rqs Rqs (K) > (K) Busy > 1 6713 8589 83.5 64.2 11.0 26.8 37.4 4.1 > 15.9 51 > 2 6713 8589 83.5 41.5 5.2 6.6 34.8 4.4 > 5.4 38 > 3 6713 8589 83.5 38.0 5.2 3.8 34.1 4.6 > 5.2 35 > 4 6713 8589 83.5 71.3 11.0 18.9 52.4 4.0 > 13.5 64 -- Larry Bolhuis Arbor Solutions, Inc. (616) 451-2500 (616) 451-2571 -fax email@example.com +--- | This is the Midrange System Mailing List! | To submit a new message, send your mail to MIDRANGE-L@midrange.com. | To subscribe to this list send email to MIDRANGE-L-SUB@midrange.com. | To unsubscribe from this list send email to MIDRANGE-L-UNSUB@midrange.com. | Questions should be directed to the list owner/operator: firstname.lastname@example.org +---
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