Hello Everyone,
I have found some time here to re-evaluate some parameters.
We have a large amount of Cache (6 gig) on the EMC box. The EMC is doing lots of
caching.
I am wondering about the overhead of the dual caching and the benefits.
It seems to me that having MDC on for the system is just overhead and dual caching.
z/VM side
q cache 740
0740 CACHE 0 available for subsystem
0740 CACHE 1 available for subsystem
06324150K Bytes configured
06324150K Bytes available
00000000K Bytes offline
00000000K Bytes pinned
0740 CACHE activated for device
VSE/ESA side
cache subsys=740,status
AR 0015 SUBSYSTEM CACHING STATUS: ACTIVE
AR 0015 CACHE FAST WRITE: ACTIVE
AR 0015 CACHE STORAGE: CONFIG. ....... 6324150K
AR 0015 CACHE STORAGE: AVAIL. ....... 6324150K
AR 0015 NVS STATUS: AVAILABLE
AR 0015 NVS STORAGE: CONFIG. ....... 196608K
AR 0015 1I40I READY
cache subsys=740,report
AR 0015 3990-E9 SUBSYSTEM COUNTERS REPORT
AR 0015 VOLUME 'RAM040' DEVICE ID=X'00'
AR 0015 CHANNEL OPERATIONS
AR 0015 <----SEARCH/READ----> <-------------WRITE------------>
AR 0015 <----SEARCH/READ----> <-------------WRITE------------>
AR 0015 TOTAL CACHE-READ TOTAL CACHE-WRITE DASD-FAST
AR 0015 REQUESTS
AR 0015 NORMAL 837170781 824709019 7467393 7463857 7467393
AR 0015 SEQUENTIAL 13620747 13148843 168445 168286 168445
AR 0015 CACHE FAST WRT 0 0 0 0 N/A
AR 0015
AR 0015 TOTALS 850791528 837857862 7635838 7632143 7635838
AR 0015
AR 0015 REQUESTS
AR 0015 INHIBIT CACHE LOADING 0
AR 0015 BYPASS CACHE 31
AR 0015
AR 0015 DATA TRANSFERS DASD->CACHE CACHE->DASD
AR 0015 NORMAL 9571687 762405
AR 0015 SEQUENTIAL 1600428 N/A
AR 0015 1I40I READY
Aultman Health Foundation
330-588-4723
[EMAIL PROTECTED]
ext. 40441
