Siemens SM2 monitoring system, U3585-J-Z125-8-76 1 manual PCA reports SM2 reports

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 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.

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.

Information on formatting disks can be found in the SM2R1 CONFIGURATION-TABLE (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.

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.

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.

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