Using Extended Address Volumes

Extended Address Volume (EAV) can be used in Control-D and Control-V, provided that the corresponding EAVUSE parameters are set to OPT and the EAV space is available.

The EAVUSE parameters override the EATTR allocation parameter of the corresponding file.

The actual allocation on the EAV depends on the SPACE allocation parameter of the corresponding file and the common z/OS or SMS definitions for the EAV volumes.

Note: The z/OS EAV rules are:

The EAV space is allocated and released by Multiple Cylinder Units (MCU). Each unit usually consists of 21 cylinders (315 tracks).
The EAV space is preferable if the primary/secondary allocation requests more than the Break Point Value (BPV) space. The BPV space usually consists of 10 cylinders (150 tracks).
The EAV space is available for SMS and non-SMS files.

The following Control-D and Control-V files are available for allocation on the EAV:

CTD REPORTS library
CTD User files and its extents
Active and Migrated to DASD CDAM and its extents
Active and Migrated to DASD Index files

The file allocation on EAV is defined by the parameters described in the following table:

Table 127 Control-D and Control-V EAV files and parameters

File	Parameter	Definition	Comments
CTD REPORTS library	EATTR	JCL DD parameter.	Defined by the EAVUSE parameter in the Express Installation or by the EAVUSE#A parameter in the Customized Installation. Can be reallocated manually.
CTD Active User file CTD Migrated User file CTD History User file CTD Permanent User file	EAVUSE	IOADBF utility's parameter. INSTWORK library, DEFxxx and DEFxxxI members.	Defined by the DEAVUSE parameter in the Customized Installation for each User file. Each User file and Index component can be reallocated on EAV separately, using the IOADBF utility.
CTD CDAMs	EAVUSE#C	CDAM section, CTDPARM member, IOA PARM library	For Active CDAM: Can be overridden by the EAVUSE parameter in the PRINT/CDAM statement of the decollation mission or the DD SUBSYS job statement of the job. For Migrated CDAM: Can be overridden by the EAVUSE#S parameter. If omitted, EAVUSE#D is used.
CTV Index files	EAVUSE#V	INDEX section, CTVPARM member, IOA PARM library	For Active Index file: Can be overridden by the EAVUSE parameter in the PRINT/CDAM statement of the decollation mission. For Migrated Index file: Can be overridden by the EAVUSE#S parameter. If omitted, EAVUSE#D is used.
CTV DASD media (Migrated CDAMs and CTV Index files)	EAVUSE#S	MEDIA section (TYPE=DASD) IOASPRM member, IOA PARM library	If omitted, EAVUSE#C is used for Migrated CDAMs and EAVUSE#V is used for Migrated Index files.
All CTD CDAMs and CTV Index files	EAVUSE#D	EAV section, CTDPARM member, IOA PARM library	The default is NO.

Parent Topic

Initialization, Customization, and Administration Features