January 2006
Intermediate to advanced
226 pages
6h 11m
English
book
Linux for IBM System z9 and IBM zSeries
by Gregory Geiselhart, Robert Brenneman, Eli Dow, Klaus Egeler, Torsten Gutenberger, Bruce Hayden, Livio Sousa
Content preview from Linux for IBM System z9 and IBM zSeries
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188 Linux for IBM System z9 and IBM zSeries
6.1 ESS operating mode
The IBM TotalStorage Enterprise Storage Server (ESS) offers different modes of
operation. Depending on the workload, the operation mode can be adjusted for
better performance. Operation modes include:
Normal Cache Replacement
In this mode, the cache is managed using the ESS standard algorithms. This
is the default value for SCSI disks, and for ECKD DASD in SLES9 and SLES8
(beginning with Service Pack 3).
Sequential Access or Prestage
Sequential access is the default for SLES7 and earlier versions of SLES8.
This mode can lead to degraded performance for workloads that require ...
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