FUJITSU CentricStor V3.1D - Manual (Page 184)

184 U41117-J-Z125-7-76
Function bar GXCC
Tape Library
The volumes of the group are stored in this physical archive. The archives defined in the
configuration are offered. This field can be changed only until the PVG has been
activated using “Distribute and Activate”.
Type
Type of the PVG. A PVG can be of the type “STACKED” or “VAULT”. STACKED means
that no external influence on the PVs is possible. VAULT means that logical deletion or
reentry of PVs in CentricStor is possible.
The default settting is “STACKED”.
Write Watermark (GB)
Write Watermark 2 (Jobs)
These two parameters control the number of drives used for the write jobs.
Write Watermark: Maximum write data volume per drive (5-digit)
Write Watermark 2: Maximum number of write jobs per drive
Explanation
The drive assignment is determined by the maximum ascertained from Watermark and
Watermark 2.
The number of drives used for save requests is defined by the PLM according to the
following formula:
n = int (1 + max (Write_data_volume/WriteWatermark,
Number_of_write_jobs/WriteWatermark_2))
n = 0 if no write jobs are present.
Only LVs with a current size of less than 10 GB are used for the calculation. Be-
cause of the anticipated backup time, LVs with a size of more than 10 GB always
require a separate drive.
Write Watermark value range: min: 5, max: 99999, default: 10
PLM Time Slice (sec)
Time in seconds for which a PDS remains assigned to a PV group. After this time has
elapsed an active job is terminated and the drive may be unloaded if required.
Depending on the load situation it is then assigned to another PVG.
The value must be >= 600 seconds.
Assignment of the physical drives to the PVGs can be controlled by different sized time
slices.
Value range: min: 600, max: 99999, default: 600
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