SCF Reference Manual for the Storage Subsystem (G06.24+, H06.03+)

Displaying Information About Magnetic Disks
SCF Reference Manual for the Storage Subsystem—529937-007
5-15
Displaying Disk Cache Statistics
Displaying Disk Cache Statistics
The STATS DISK Command (page 14-136) displays cache statistics about a magnetic
disk.
-> STATS $AUDIT
STORAGE - Stats DISK \ALM171.$AUDIT
Current Time............. 07 Jul 2001, 13:12:25.369
Counters Reset Time...... 07 Jul 2001, 10:29:59.176
Elapsed Time............. 0 days, 02:42:26
Bytes Allocated To Cache. 5748 K
Writes/Control Point..... 0.00
Cache Block Size______________512________1024_________2048_________4096__
Blocks Requested......... 640 640 56 53
Blocks Allocated......... 640 36 56 50
Blocks In Use............ 20 20 49 42
Blocks Dirty............. 16% 77% 63% 24%
Cache Reads.............. 66% 72% 82% 78%
Cache Read Hits.......... 90% 63% 69% 15%
Cache Read Misses........ 10% 37% 31% 85%
Cache Writes............. 34% 28% 18% 22%
Cache Write Dirties...... 12% 19% 26% 32%
Cache Write Cleans....... 81% 69% 45% 46%
Cache Write Misses....... 7% 12% 39% 22%
Cache Calls.............. 56 356 231 184
Cache Faults............. 0 0 0 0
Audit Forces............. 2 1 2 0
Explanation of Fields
Current Time the date and time of this STATS DISK report.
Counters Reset
Time
shows when the system was last loaded or when the counters
were reset. Use the STATS DISK, RESET command (see
page 14-137) to reset the counters.
Elapsed Time the total elapsed time since the counters were reset, the disk was
started, or the system was loaded.
Bytes Allocated
To Cache
the total memory allocated to cache (in kilobytes). This value
equals the number of blocks allocated for a particular block size,
multiplied by the block size, and totaled for all block sizes.
Writes/Control
Point
the average number of buffers that had to be written to disk at
each control point (the result of dividing the number of writes
forced at a control point by the number of control points that were
encountered since the counters were initialized).
Cache Block
Size
the specific block size (in bytes) for each cache block.