Siemens SM2 monitoring system Monitored data on caches under User PFA, Monitored data on Posix

PFA SM2 monitoring programs

PFA

Monitored data on caches under User PFA

User PFA (User Controlled Performant File Access) allows users to assign performance attributes to files, thus converting them into hiperfiles (High Performance Files). The idea behind hiperfiles is that file access is accelerated by buffering the file in a high-speed cache in order to avoid the slow disk input/output operations. The following cache media are used for hiperfiles: main memory (MM), global storage (GS), 3419/21, 3860 and SYMMETRIX cache controllers, and SSDs (solid state disks). Depending on the cache medium, the caches are administered by DAB (main memory, ES, GS), by PCA (disk controllers with cache, CTL), or by the hardware itself (SYMMETRIX).

The PFA monitoring program records monitored data on all user PFA caches. This data may overlap with that contained in the PCA, DAB and SYMMETRIX reports.

Note

The PFA monitoring program also records information on SYMMETRIX controllers which are not used in accordance with the PFA concept. This information is output to the SYMMETRIX reports (see page 302ff) and applies globally to the SYMMETRIX controller. In other words, the data output is not host-oriented.

The data in PFA reports refers to the PFA cache and is likewise not host-oriented. Only SYMMETRIX reports should be taken into account for SYMMETRIX controllers. With the introduction of SYMMETRIX reports, it no longer makes sense to configure PFA pubsets in SYMMETRIX controllers.

POSIX

Monitored data on POSIX

This monitoring program provides information on the POSIX subsystem.

This information corresponds to the options and output data of the SINIX command “sar”.

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