Siemens Network Hardware SM2 monitoring system ユーザーズマニュアル
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U3585-J-Z125-8-76
PCA reports
SM2 reports
PCA reports
SM2 collects monitored data on 3419/21 controllers with a cache which are managed by
the PCA subsystem. Unlike other SM2 monitoring programs, this information is not host-
specific, rather refers globally to a controller. This must be taken into account particularly
when interpreting the data.
the PCA subsystem. Unlike other SM2 monitoring programs, this information is not host-
specific, rather refers globally to a controller. This must be taken into account particularly
when interpreting the data.
The PCA CONTROLLER report supplies summary information for all installed 3419/21
controllers. If you require detailed information (cache and device data), you can also
request a PCA CACHE and PCA DEVICE report.
controllers. If you require detailed information (cache and device data), you can also
request a PCA CACHE and PCA DEVICE report.
Notes
Only the PCA values of devices assigned a cache area are counted.
In the case of access values, I/O operations are counted.
Only the value #PEND.BLOCKS is counted in PAM blocks or 4K blocks, depending on
the disk type (K/NK2 or NK4). The disks for which caching is carried out under a
CACHE-ID must have a homogeneous format: either all disks must have the K/NK2
format or they must all have the NK4 format; i.e. the #PEND.BLOCKS can be counted
either in 2Kb or 4Kb blocks for each CACHE-ID. When this monitoring value is inter-
preted, the block size must be taken into account.
The summary information for #PEND.BLOCKS in the PCA-CONTROLLER report does
not supply a usable value for different block sizes.
Only the value #PEND.BLOCKS is counted in PAM blocks or 4K blocks, depending on
the disk type (K/NK2 or NK4). The disks for which caching is carried out under a
CACHE-ID must have a homogeneous format: either all disks must have the K/NK2
format or they must all have the NK4 format; i.e. the #PEND.BLOCKS can be counted
either in 2Kb or 4Kb blocks for each CACHE-ID. When this monitoring value is inter-
preted, the block size must be taken into account.
The summary information for #PEND.BLOCKS in the PCA-CONTROLLER report does
not supply a usable value for different block sizes.
Information on formatting disks can be found in the SM2R1 CONFIGURATION-TABLE
(see Volume 2).
(see Volume 2).
SM2 does not output any PCA-SSD values, since SSDs (solid state disks of type 3409)
are handled as normal devices by SM2.
are handled as normal devices by SM2.
In "write mode", 100% is output for READ H-RATE if there are any read hits. If this is
not the case, 0% is output.
not the case, 0% is output.
In the case of a purely read cache, "fast writes" are counted, provided the blocks to be
written are already in the cache (as a result of a previous read operation), but input/
output is executed quickly.
written are already in the cache (as a result of a previous read operation), but input/
output is executed quickly.