Chapter 6 HPSS Configuration
312 September 2002 HPSS Installation Guide
Release 4.5, Revision 2
6.7.1.2 Storage Subsystem Specific Thresholds
If different Warning and Critical Thresholds are desired for a storage class in different storage
subsystems, it is possible to override the default values. By default, the Warning and Critical
Thresholds specified on the Storage Class Configuration window are applied to that storage class
Average Latency The average time (in
seconds) that elapses when
a data transfer request is
scheduled and the time the
data transfer begins. This
field is only applicable to
tape storage classes.
Any positive 32-bit integer value. Based on
selected
Media Type.
Advice: For additional information relating to the selection of storage system
characteristics fields, refer to Section 2.9.3.5.
Maximum VVs to Write The number of tape virtual
volumes in the storage
class that a Tape Storage
Server will use for
concurrent writes. This
field is only applicable to
tape storage classes.
Any positive 32-bit integer value. 10.
Advice: Small values in this field restrict files being written in the storage class to a
small number of tapes, reducing the number of tape mounts. The number of tape
drives used to write files in the storage class will be limited to approximately the
value of this field times the stripe width. Read operations are not limited by this
value.
AverageNumberofStorage
Segments
If the Maximum Storage
Segment Size field is
greater than the Storage
Segment Size field, the
Bitfile Server attempts to
select a storage segment
size for a bitfile such that
the bitfile can be stored in
this number of storage
segments. This field is
only applicable to disk
storage classes.
Any positive 32-bit integer value
limited by the maximum number of
VVs created for the storage class.
4.
Advice: The number of Storage Segments of a particular file that can be stored
simultaneously on tape is unlimited; however, no filecan have more than 10,000disk
storage segments at any one time. Also, increasing the number of storage segments
will increase the amount of metadata activity required to process file reads and
writes. So it is a good idea to keep this number low.
Table 6-11 Storage Class Configuration Variables (Continued)
Display Field Name Description Acceptable Values
Default
Value
