Summary of changes for z/OS® Version 2 Release 4 (V2R4)

The most recent updates are listed at the top of each section.

New

April 2021 refresh

Added cloud storage to the storage hierarchy list. For more information, see Object and object backup storage groups.
Added information to reflect the addition of the IARS=0, OSL=3 combination to indicate the cloud level. For more information, see Planning storage groups for OAM object collections and Object access.
With APAR OA51662, various updates for transparent cloud tiering were made. A new chapter was added about defining network connections. See Defining network connections.

December 2020 refresh: Added Network Connection to the primary option menu of Using the Interactive Storage Management Facility, added A valid minimal SMS configuration and The SMS construct naming convention sections to Defining your storage management policy.

September 2020 refresh

With APAR OA56622, support is added for the &DSKEYLBL read-only variable and STGADMIN.SMS.ALLOW.DATASET.SEQ.ENCRYPT RACF® profile. See Read-only variables and Command and keyword related profiles.
In support of PDSE encryption, STGADMIN.SMS.ALLOW.PDSE.ENCRYPT RACF profile is added. For more information, see Command and keyword related profiles.

Prior to June 2020 refresh

With APAR OA58384, support is added for a full screen mode on 3270 displays under ISPF when 62x160 screen size is set. The list of screen sizes in Listing SMS classes, aggregate groups, storage groups, and libraries using ISMF was updated.
As a result of APAR OA55746, the sample job was updated in Sample JCL for generating model commands from ISMF-saved list. How to create model commands was also updated.
Information was added about secondary space reduction. See Specifying attributes to handle space constraints during allocation.
APAR OA58064 added a note to Defining sharing control data sets. Recovering a sharing control data set was also updated.
APAR OA58909 added a note to Using the sample JCL for batch.
A new restriction was added to Allocating control data sets.
Types of allocation was added to provide clarification about best-fit and non-best-fit allocation.
The new STGADMIN.IGG.DELAUDIT.catalogname profile has been added to Command and keyword related profiles. Storage administration (STGADMIN) profiles in the FACILITY class or XFACILIT class has been updated.
Sample JCL for define/Alter/Display management class has been updated.
NaviQuest CLISTS and REXX EXECS has been updated.
SYS1.SACBCNTL sample JCL library has been updated.
Added a new action regarding access authorization with VSAM RLS. For more information, see Establishing authorization for VSAM RLS.

The following content is changed.

March 2021 refresh: With APAR OA59837, Command and keyword related profiles is updated.
December 2020 refresh: With APAR OA59871, Authority to activate a Storage Management Subsystem configuration is updated.

August 2020 refresh

Prior to June 2020 refresh

In APAR OA58596, the description of BreakPointValue was updated. See Values for defining a pool storage group.
In APAR OA57170, a clarification indicated that the system-determined block size (SDB) shows whether the SDB will be used regardless of the existence of a user-specified block size only when the data set is created. "System Determined Block Size" was changed to "Force System Determined Block Size" in Defining volume and data set attributes for data class.
For APAR OA56292, information was added to address what occurs when an MMF storage pool runs out of extents. For more information, see Selecting data sets for coupling facility statistical monitoring.
For APAR OA57356, information was added about transition in the Storage Class for the Direct Millisecond Response under the DFSMShsm class. For more information, see Defining performance objectives.
Changed by adding read-only variables and their descriptions. For more information, see Read-only variables.
Changed by adding a bullet point under the section Comparison rules.
Changed the title of Table 32 to include ACBJBAI7 and ACBJBAOU parameters. For more information, see Generate a data set list: ACBQBAI2
Changed the DSN(dsname) parameter and description. For more information, see Generate a data set list: ACBQBAI2.
Changed by adding support of FlashCopy® onto Global Mirror primaries on the D/T2107 storage system. For more information, see Steps for defining a copy pool.

The following content is deleted.

December 2020 refresh: Deleted Defining SMS as trusted to RACF as SMS now starts automatically at IPL time and marks itself as privileged so there is no need to also define SMS as trusted to RACF.