Are dataspaces being used? DB2 and SFS are the the most common examples. With dataspaces (mapped to minidisks), the application simply reference the storage, CP will page-in what is referenced, and that is counted as paging.
CP's Q SPACES and IND SPACE commands can help you. On VM's web-site, there is a document were I describe this in more detail: http://www.vm.ibm.com/perf/tips/dim.html http://www.vm.ibm.com/perf/tips/vmdspage.html 2008/5/17 O'Brien, Dennis L <Dennis.L.O'[EMAIL PROTECTED]>: > > We recently inherited responsibility for a z/VM 5.2 system that had been > maintained by another group. They had a DR test today, and I logged on > and looked around. The LPAR is configured with 3G central storage and > no expanded storage. I issued the following commands: > > q alloc page > EXTENT EXTENT TOTAL PAGES HIGH % > VOLID RDEV START END PAGES IN USE PAGE USED > ------ ---- ---------- ---------- ------ ------ ------ ---- > VMPG00 8719 1 1000 180000 1 1 1% > VMPG01 871A 1 1000 180000 0 0 0% > VMPG02 871B 1 1000 180000 0 0 0% > VMPG03 871C 1 1000 180000 0 0 0% > ------ ------ ---- > SUMMARY 720000 1 1% > USABLE 720000 1 1% > Ready; > ind > AVGPROC-003% 01 > MDC READS-000112/SEC WRITES-000003/SEC HIT RATIO-093% > PAGING-13/SEC STEAL-000% > Q0-00003(00000) DORMANT-00141 > Q1-00000(00000) E1-00000(00000) > Q2-00001(00000) EXPAN-001 E2-00000(00000) > Q3-00000(00000) EXPAN-001 E3-00000(00000) > > PROC 0000-003% > > LIMITED-00000 > Ready; > q xstor > Expanded storage is not available within this hardware configuration. > Ready(01401); > > Since there's no expanded storage, where are those 13 pages/second > going? Is the system reading the one page that's out on DASD 13 times a > second? I did another Q ALLOC PAGE after the IND, and there's still > only one page out there. > > Dennis O'Brien > > "Elected office holds more perks than Elvis' nightstand." -- Dennis > Miller -- Kris Buelens, IBM Belgium, VM customer support
