This section contains an alphabetic list of the attributes that can be coded in the customizable Group Sections. The list contains a description of each attribute, its valid values, and the CA Vtape features it supports. Unless specifically noted, each attribute is considered local in scope.
A free form description of the group limited to 30 characters. The value coded must be enclosed in single quotes.
Valid Values: 'Any 30 characters'
Feature: Miscellaneous
Determines if compression should be performed on data written to Virtual Volumes that are assigned to this group.
Note: This attribute is only active if the HardwareCompressionOption attribute in the Dynamic Options Section is set to GROUP.
Valid Values:
Indicates that compression should never be performed.
Indicates that compression should always be performed.
Indicates that compression should be performed if TRTCH=COMP is coded in the JCL or if COMPACT=YES was used when defining the Virtual Devices. If TRTCH=NOCOMP is coded in the JCL, compression will not be performed.
Note: For more information about Virtual Volume Compression, see the chapter “Virtual Device Engine.”
Default: N
Feature: Virtual Volume Compression
Determines the maximum amount of data in each 50 MB segment of data written to a Virtual Volume that will be compressed. This percentage is directly related to the amount of CPU used by compression. If, for example, this percentage is set to 75, only 75% of the data written will be compressed and only 75% of the CPU that would have been used by compression is actually used.
Note: This attribute is only active if the HardwareCompressionOption attribute in the Dynamic Options Section is set to GROUP.
Valid Values:
Indicates that no data should be compressed. This setting should only be used temporarily. If compression should be turned off permanently, the HardwareCompressionOption attribute should be used.
Indicates the actual percentage of data written that should be compressed. If set to 50, only 50% of each 50 MBs of data written to a Virtual Volume will be compressed.
Indicates compress all the data.
Note: For more information about Virtual Volume Compression, see the chapter “Virtual Device Engine.”
Default: 100
Feature: Virtual Volume Compression
Determines the minimum compression percentage that must be achieved to continue compressing a 50 MB segment of a Virtual Volume being written. Compression is tested every 50 MBs of each Virtual Volume to determine the best compression method to use.
Note: This attribute is only active if the HardwareCompressionOption attribute in the Dynamic Options Section is set to GROUP.
Note: For more information about Virtual Volume Compression, see the chapter “Virtual Device Engine.”
Valid Values: 1 to 100
Section: Group Sections
Feature: Virtual Volume Compression
Specifies the name of the Virtual Volume pool used to obtain the volser for new scratch mount requests.
Virtual Volume pools are defined in the Volume Pool Definitions Section of the OSPOOLS member.
Valid Values: POOL1 or any valid virtual volume pool defined under the Volume Pool Definitions Section.
Default: POOL1
Section: Group Sections
Feature: Miscellaneous
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