Z/Os (Mvs) Cache Operations - HP XP P9500 Operation Manual

Table 10 ICKDSF Commands for P9000 Disk Array Contrasted to RAMAC (continued)
Command
REVAL
CONTROL
INIT
REFORMAT
CPVOLUME

z/OS (MVS) Cache operations

To display the cache statistics under MVS DFSMS, use the operator command: D SMS, CACHE.
The following example shows the cache statistics reported by the storage system. The storage
system reports cache statistics for each SSID in the storage system. Because the dynamic cache
management algorithm has been enhanced, the read and write percentages for the storage system
are displayed as N/A. For further information on MVS DFSMS cache reporting, see the IBM
documentation.
SSID DEVS
0004 15
0005 11
0006 11
0007 10
****************************************************
SSID=SUBSYSTEM IDENTIFIER
DEVS=NUMBER OF MANAGED DEVICES ATTACHED TO SUBSYSTEM
READ=PERCENT OF DATA ON MANAGED DEVICES ELIGIBLE FOR CACHING
WRITE=PERCENT OF DATA ON MANAGED DEVICES ELIGIBLE FOR FAST WRITE
HIT RATIO=PERCENT OF READS WITH CACHE HITS
FW BYPASSES=NUMBER OF FAST WRITE BYPASSES DUE TO NVS OVERLOAD
The storage system supports the following MVS cache operations:
IDCAMS LISTDATA COUNTS. When the <system> parameter is used with the LISTDATA
command, the user must issue the command once for each SSID to view the entire storage
system image. The following shows a JCL example of the LISTDATA COUNTS command.
//LIST JOB. . . . . .
//COUNT1 EXEC PGM=IDCAMS
//SYSPRINT DD SYSOUT=A
//SYSIN DD *
LISTDATA
LISTDATA
30 Mainframe operations
Argument
REFRESH
DATA, NODATA
READ WRITE HIT RATIO
N/A N/A 50% 0
N/A N/A 0% 0
N/A N/A 87% 0
N/A N/A 87% 0
COUNTS VOLUME(VOL000)
COUNTS VOLUME(VOL064)
Storage System
P9000 disk array
RAMAC
P9000 disk array
RAMAC
P9000 disk array
RAMAC
P9000 disk array
RAMAC
P9000 disk array
RAMAC
P9000 disk array
RAMAC
P9000 disk array
FW BYPASSES
UNIT(3390) SUBSYSTEM
UNIT(3390) SUBSYSTEM
Return Code
CC = 0
CC = 12 Device not
supported for the specified
function.
CC = 12, F/M = 04
(EC=66BB) Error, not a data
check. Processing
terminated.
CC = 0, Data/Nodata
parameter not allowed.
CC=0
CC = 0, ALT information not
displayed.
CC = 0, ALT information not
displayed.
CC = 0, ALT information not
displayed.
CC = 0
CC = 0, ALT information not
displayed.
CC=0
CC = 0, Readcheck
parameter not allowed.
CC=0