I used to have QUICKDSP turned on when I only had about 3 Linux systems a couple years ago. When I did my last installs in the spring, with RH 7.2 I believe in my planning I ran across something somewhere that said to only have QUICKDSP on you most important Linux systems. Since I was planning on eventually having about 500-1000 of these things I took QUICKDSP off. It seemed like that is what was being recommended for users with lots of Linux images.
Lonny -----Original Message----- From: Kris Van Hees [mailto:[EMAIL PROTECTED]] Sent: Friday, September 20, 2002 11:02 AM To: [EMAIL PROTECTED] Subject: Re: z/VM 4.2 Dispatching Problem running about 120 Linux copies Do the Linux images have a CP directory option that has to do with the dispatching, such as QUICKDSP? Kris On Fri, Sep 20, 2002 at 10:36:50AM -0400, Sivey,Lonny wrote: > We are currently running about 120 Linux instances on our 1 IFL G5 with 1.5G > storage. > > After I added about the 100th Linux, VM began refusing to dispatch some of > them for extremely long periods of time (hours). If I re-IPL VM and start > all 120 Linux systems up again it runs fine for a couple days, then the > problem starts occurring again. I Think a VM resource is being over > committed or something, so VM just decides it doesn't have the resource to > run some of them anymore so it puts them on the eligible list, but, never > dispatches them again or at least not until a resource becomes available > again which could be hours later. > > INDICATE Shows: > > AVGPROC-034% 01 > MDC READS-000001/SEC WRITES-000000/SEC HIT RATIO-095% > STORAGE-096% PAGING-0002/SEC STEAL-000% > Q0-00002(00001) DORMANT-00012 > Q1-00000(00000) E1-00000(00000) > Q2-00000(00000) EXPAN-001 E2-00000(00000) > Q3-00115(00000) EXPAN-002 E3-00008(00006) > > PROC 0000-034% > > LIMITED-00000 > > Here's what RTM shows: > > <USERID> %CPU %CP %EM ISEC PAG WSS RES UR PGES SHARE VMSIZE TYP,CHR,STAT > > VMSERVU IDLE .00 .00 .00 .00 1178 2 .0 1178 1500 32M VUC,QDS,IDLE > VMSERVS IDLE .00 .00 .00 .00 1169 2 .0 1169 1500 32M VUC,QDS,IDLE > OPERSYMP IDLE .00 .00 .00 .00 1193 0 .0 1193 100 32M VUX,DSC,IDLE > EREP IDLE .00 .00 .00 .00 67 0 .0 1164 100 32M VUX,IAB,IDLE > FTPSERVE IDLE .00 .00 .00 .00 19 21 .0 1589 100 16M VUC,IAB,IDLE > CDM0007 IDLE .00 .00 .00 .00 3934 3335 .0 5373 100 32M VUS,DSC,ELIG > CDM0091 IDLE .00 .00 .00 .00 4455 3764 .0 5163 100 32M VUS,DSC,ELIG > CDM0092 IDLE .00 .00 .00 .00 7064 31 .0 7642 100 32M VUS,DSC,ELIG > CDM0099 IDLE .00 .00 .00 .00 7854 28 .0 7630 100 32M VUS,DSC,ELIG > CDM0104 IDLE .00 .00 .00 .00 7710 32 .0 7671 100 32M VUS,DSC,ELIG > CDM0105 IDLE .00 .00 .00 .00 7958 3725 .0 7634 100 32M VUS,DSC,ELIG > CDM0086 IDLE .00 .00 .00 .00 7880 26 .0 7464 100 32M VUS,DSC,ELIG > IBML01 IDLE .00 .00 .00 .00 16K 16K .0 1 200 64M VUS,DSC,ELIG > > > All of the users with a status of ELIG in the list are Linux systems. There > seems to be plenty of CPU available and paging is light. Anyone got an idea > what might be causing VM to not dispatch these users? > _____________________________________ > Lonny Sivey > System Support Division > OCLC Online Computer Library Center, Inc. > 6565 Frantz Rd, Dublin, OH 43017 > (614) 764-6013 FAX (614) 718-7200 > mailto:[EMAIL PROTECTED] > _____________________________________ -- Never underestimate a Mage with: - the Intelligence to cast Magic Missile, - the Constitution to survive the first hit, and - the Dexterity to run fast enough to avoid being hit a second time.
