FUJITSU CentricStor V3.1D - Manual (Page 79)

U41117-J-Z125-7-76 79
Selected system administrator activities Reorganization
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.
The form and detailed information are provided in the section “Physical Volume
Operations » Reorganize Physical Volumes” on page 257 .
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:
10:00 - 14:00
Soft Minimum
The minimum number of physical volumes (scratch tapes) which, if fallen below,
automatically triggers a reorganization process.
Default:
30
Recommendation: Empty physical volumes required per week + Absolute Minimum
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:
8
Recommendation: Empty physical volumes required per week + Absolute Minimum
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:
4
Recommendation: Number of Physical Device Services
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.
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