SCF Reference Manual for the Storage Subsystem (G06.28+, H06.05+, J06.03+)

The number of blocks that either were requested by an ALTER DISK, CACHE
configuration command or set by default for each block size. A value of -1 indicates
that no default value is set for the number of blocks required.
Cn
The number of blocks allocated to cache for each block size.Al
The total memory allocated to cache. This value equals the number of blocks allocated
for a particular block size, multiplied by the block size, and totaled for all block sizes.
Bytes Allocated To Cache
Displaying Disk Cache Statistics
The “STATS DISK Command” (page 277) displays cache statistics about a disk.
1-> STATS $DATA00
STORAGE - Stats DISK \NBSTS01.$DATA00
Cache Statistics:
Current Time............. 23 Jul 2013, 14:38:05.260
Counters Reset Time...... 23 Jul 2013, 14:26:34.317
Elapsed Time............. 0 days, 00:11:30
Bytes Allocated To Cache. 34560 KB
Writes/Control Point..... 0.00
Block Size___________512_________1K_________2K_________4K
Requested.... -1 -1 -1 -1
Allocated.... 512 512 512 4096
Blocks In Use 0 0 0 208
Blocks Dirty. 0 % 0 % 0 % 0 %
Cache Reads.. 1 % 0 % 0 % 82 %
Read Hits.... 90 % 0 % 100 % 99 %
Read Misses.. 10 % 0 % 0 % 1 %
Cache Writes. 99 % 100 % 100 % 18 %
Write Dirties 0 % 0 % 0 % 0 %
Write Cleans. 98 % 98 % 98 % 99 %
Write Misses. 2 % 2 % 2 % 1 %
Cache Calls.. 1001 198 596 1725
Cache Faults. 0 0 0 0
Audit Forces. 0 0 0 0
Explanation of Fields — Disk Cache Statistics
The date and time of this STATS DISK report.Current Time
Shows when the system was last loaded or when the counters were reset. Use the STATS
DISK, RESET command (see “STATS DISK Command” (page 277)) to reset the counters.
Counters Reset Time
The total elapsed time since the counters were reset, the disk was started, or the system
was loaded.
Elapsed Time
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.
Bytes Allocated To Cache
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).
Writes/Control Point
The specific block size (in bytes) for each cache block.Block Size
The default number of cache blocks that are requested.Requested
The number of cache blocks allocated.Allocated
60 Displaying Information About Disk Drives