Phil, you might want to add some paging vols. We've noticed that things go down hill fast when paging space is > 50% (in our dev/test env with mostly WAS).
Marcy -----Original Message----- From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On Behalf Of Philip Tully Sent: Friday, December 17, 2010 5:33 AM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: [IBMVM] Expanded storage question We have a different situation from you Martha in that we can't add more central storage. Our current experience is that with a heavily over-committed lpar large amounts of expanded storage allows for reasonab= le performance with high paging rates. I include output from the vir2real exec to see the config we are running,= this is dev/test NOT PROD, and we are increasing xstore to 32Gb this week= end. = = Storage information for VM system VLB2 = = Any userid using NSSes "CMS GCS" are considered CMS users. = = = = Total Virtual storage (only ids not running CMS): 732340 MB ( 715.2 GB)= Total Virtual storage (only ids running CMS): 1200 MB ( 1.2 GB)= Total Virtual storage (all logged on userids): 733540 MB ( 716.3 GB)= Usable real storage (pageable) for this system: 259884 MB ( 253.8 GB)= Total LPAR Real storage: 262144 MB ( 256.0 GB)= Expanded storage usable for paging: 24544 MB ( 24.0 GB)= = = = Total Virtual disk (VDISK) space defined: 17285 MB ( 16.9 GB)= Average Virtual disk size: 98 MB = = = = Virtual to (usable) Real storage ratio: 2.8 : 1 = Virtual + VDISK to Real storage ratio: 2.9 : 1 = Virtual to Real ratio (non CMS work only): 2.8 : 1 = = = = Paging: 18 volumes defined, total space is: 413696 MB ( 404.0 GB)= Total Paging space in use (60% utilization): 248864 MB ( 243.0 GB)= Ready; = = =
