Siemens U3585-J-Z125-8-76 1 manual PFA Cache report, BLK Size, Rd Hit, Wr Hit, Overruns

SM2 reports	PFA CACHE report
BLK SIZE	Block size of the cache
SIZE	Size of the cache
READ	Number of read operations to hiperfiles (in I/Os per second)
RD HIT	Percentage of hits in the total number of read operations to hiper-
	files
WRITE	Number of write operations to hiperfiles (in I/Os per second)
WR HIT	Percentage of fast write operations in the total number of write
	operations to hiperfiles
OVERRUNS	Number of unsuccessful attempts to use the cache due to overload
	(per second)

Notes

–The number of read and write accesses is output to one decimal place. Read and write rates less than 0.05 per second are rounded down to 0.0 per second and hit rates are calculated.

–In SYMMETRIX controllers, 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%. If this occurs, delayed fast writes will be output under OVERRUNS.

U3585-J-Z125-8-76 287