Siemens SM2 monitoring system, U3585-J-Z125-8-76 1 manual Wr Hit, Tot Hit

SYMMETRIX CONTROLLER report		SM2 reports
WR HIT	Percentage of write operations that did not need to be delayed (see
	notes)
TOT HIT	Percentage of read and write operations completed by the cache in
	relation to the total number of access operations executed

Notes

The monitored data output here refers to the controller as a whole, i.e. it includes access operations from other hosts.

WR HIT:

All write operations are executed via the cache as fast writes. An exception are delayed fast writes: if the cache is filled with unsaved write data, these may be forced to wait temporarily for a cache slot to become available. A WR HIT is one write operation that need not be delayed. Only very high write loads will cause the WR HIT rate to fall below 100%.

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