Siemens Network Hardware SM2 monitoring system 사용자 설명서
U3585-J-Z125-8-76
287
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
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
operations to hiperfiles
OVERRUNS
Number of unsuccessful attempts to use the cache due to overload
(per second)
(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.
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.
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.