Siemens SM2 monitoring system, U3585-J-Z125-8-76 1 manual Mnemonic name of the device

SYMMETRIX DEVICE report		SM2 reports
Monitoring information
CONTROLLER MN	Mnemonic name of an emulated 3860 controller.
	In all SM2 output, two controller mnemonics are always output
	(separated by a slash) for an emulated 3860 controller. The
	following two variants are provided:
	–	alphanum-name 2..2
	–	x-text 4..4
DEVICE MN	Mnemonic name of the device
READ	Number of read operations per device and per second
RD HIT	Percentage of read operations completed by the cache in relation to
	the total number of read operations
WRITE	Number of write operations per device and per second
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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