Configuration Parameters - Fujitsu Siemens Computers pmn User Manual

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4.4.7 Configuration parameters

All configuration parameters can be set specifically for each physical volume group.
It must be ensured that a dependency on the number of available drives exists and that not
too many reorganizations take place in parallel, otherwise these will be delayed unneces-
sarily on account of the lack of drives. Each reorganization requires two drives: one for rea-
ding in and one for writing.
i
Time Frame
This parameter defines the time of day interval within which the reorganizations resul-
ting from the soft minimum limit value being fallen below again, for refreshing and for re-
storing the backups for physical volumes in faulty or inaccessible status should take
place.
The interval should be in an off-peak period.
Default:
Soft Minimum
The minimum number of physical volumes (scratch tapes) which, if fallen below,
automatically triggers a reorganization process.
Default:
Recommendation:
Hard Minimum
If the number of free physical volumes (scratch tapes) specified here is fallen below, a
reorganization run is started immediately, i.e. regardless of the Time Frame parameter.
Default:
Recommendation:
Absolute Minimum
Absolute minimum number of free physical volumes (scratch tapes). When this
minimum is reached, all resources are used with priority for reorganization. The
following hierarchy must be observed:
Soft Minimum > Hard Minimum > Absolute Minimum.
Default:
Recommendation:
Fill Grade
This parameter defines a particular percentage value for the proportion of valid data in
relation to the total amount of written date on a physical volume.
All physical volumes in read status on which the percentage of valid data is below this
limit are candidates for reorganization.
U41117-J-Z125-7-76
The form and detailed information are provided in the
Operations » Reorganize Physical Volumes" on page
10:00 - 14:00
30
Empty physical volumes required per week + Absolute Minimum
8
Empty physical volumes required per week + Absolute Minimum
4
Number of Physical Device Services
Reorganization
section "Physical Volume
257.
79