The Parameter Library (Parmlib) › Parmlib Sample Members, Format, Syntax, Attributes, and Tables › OSGROUP Parmlib Member › Group Sections

Group Sections

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 noted, each attribute is local in scope.

Description=

A free form group description that is limited to 30 characters. Enclose the coded value in single quotes.

Valid Values: 'Any 30 characters'

Feature: Miscellaneous

HardwareCompressionOption=

Determines if compression is 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:

• N

  Indicates that compression is never be performed.

• Y

  Indicates that compression is always be performed.

• JCL

  Indicates that compression is 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 is not performed.

Note: For more information about Virtual Volume Compression, see the chapter “Virtual Device Engine.”

Default: N

Feature: Virtual Volume Compression

MaximumCompressionCPU=

Determines the maximum data amount in each 50MB segment of data that is written to a Virtual Volume to be compressed. This percentage is directly related to the CPU amount the compression uses. For example, if you enter 75, then the system compresses 75% of the data that is written and uses 75% of the CPU that compression would have required.

Note: To activate this attribute, in the Dynamic Options Section, set the HardwareCompressionOption attribute to GROUP.

Valid Values:

• 0

  Indicates that no data is compressed. Use this setting temporarily. If you want compression turned off permanently, configure the HardwareCompressionOption attribute.

• 1 to 99

  Indicates the actual percentage of data written that is compressed. If you enter 50, then 50% of each 50MBs of data that is written to a Virtual Volume is compressed.

• 100

  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

MinimumCompressionRate=

Determines the minimum compression percentage that must be achieved to continue compressing a 50MB 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

VolumePool=

Specifies the name of the Virtual Volume pool that is 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 that is defined under the Volume Pool Definitions Section.

Default: POOL1

Section: Group Sections

Feature: Miscellaneous