Siemens U3585-J-Z125-8-76 1, SM2 monitoring system manual PCA Device report, Read H-RATE %

SM2 reports	PCA DEVICE report
READ (1/S)	Total number of read operations (in I/Os per second)
C-READ (1/S)	Total number of read operations to be executed as fast reads
	(caching reads) (in I/Os per second)
READ H-RATE %	Percentage of hits based on the total number of read operations to
	be executed as fast reads
WRITE (1/S)	Total number of write operations (in I/Os per second)
FAST W. (1/S)	Total number of all fast write operations performed (in I/Os per
	second)
C-OVER (1/S)	Number of unsuccessful attempts to use the cache due to a cache
	overrun (in I/Os per second)

Notes

If a miss occurs during a caching read operation ("fast read"), the data is read from disk and (in contrast to a read operation) stored in the cache. Cache overruns can only occur in write operations. In the event of an overrun, the write operation bypasses the cache and is performed directly on the disk.

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