Nobody told why page space should not be filled too much: CP uses block paging, that is it writes multiple pages out with one I/O, the number of pages varies. After a while, the paging areas get fragmented, and CP an have a hard time to find a free spot to store the blocks of pages that it has formed, hence it can have to split up the block. As a result: more CPU usage and more I/O.
2008/6/24 Marcy Cortes <[EMAIL PROTECTED]>: > > First, get that 73% number to < 50% ASAP. > > > Marcy > > "This message may contain confidential and/or privileged information. If > you are not the addressee or authorized to receive this for the > addressee, you must not use, copy, disclose, or take any action based on > this message or any information herein. If you have received this > message in error, please advise the sender immediately by reply e-mail > and delete this message. Thank you for your cooperation." > > > > ________________________________ > > From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On > Behalf Of Hamilton, Brian > Sent: Tuesday, June 24, 2008 12:23 PM > To: IBMVM@LISTSERV.UARK.EDU > Subject: Re: [IBMVM] Performance toolkit under zVM 5.3...Looking to see > a snap shot of CPU utilization and Storage Utilization > > > > Thanks everyone, > > > > Under option #2 it shows a Storage utilization of 89% and through CMS if > I issue the command q alloc page I see that over 3 3390 mod 3's I have a > utilization of 73%. > > > > So if I were to summarize this out of 8gb real storage assigned to the > lpar performance toolkit is showing 89% usage. > > > > And from my 3 page volumes I'm using 73%. > > > > Sound right. > > > > ________________________________ > > From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On > Behalf Of Dave Yarris > Sent: Tuesday, June 24, 2008 3:04 PM > To: IBMVM@LISTSERV.UARK.EDU > Subject: Re: Performance toolkit under zVM 5.3...Looking to see a snap > shot of CPU utilization and Storage Utilization > > > > > A lot to look at on the screens, but option #1 "CPU load and trans." > and option #2 "Storage utilization" on the PERFSVM green screen should > tell you most of what you need to know to give you some idea. > > > > > > "Hamilton, Brian" <[EMAIL PROTECTED]> > Sent by: The IBM z/VM Operating System <IBMVM@LISTSERV.UARK.EDU> > > 06/24/2008 02:30 PM > > Please respond to > The IBM z/VM Operating System <IBMVM@LISTSERV.UARK.EDU> > > > > To > > IBMVM@LISTSERV.UARK.EDU > > > cc > > > > > Subject > > Performance toolkit under zVM 5.3...Looking to see a snap shot > of CPU utilization and Storage Utilization > > > > > > > > > > > > > > > Hi, > > Looking to find some where on one of the performance toolkit screen > something that will show me the overall CPU utilization and Storage > utilization. > > We are trying to determine if another IFL is needed or more real storage > on the box. > > Thanks > > Brian -- Kris Buelens, IBM Belgium, VM customer support
