Allocating the RTCS Subsystem SYSTEM Registry

Allocate a VSAM LDS cluster for the RTCS Subsystem SYSTEM Registry, either by allocating:

  • One for each z/OS image if you are not going to share the registry
  • One to be shared sysplex-wide by all members of the sysplex

Related topic

Manually-configuring-RTCS


Important

  • We recommend that the registry data set must not be under the control of the Storage Management System (SMS). If the data set must be under SMS control, make sure that you specify storage class and management class values that allow the data set to be kept indefinitely. The data set must not be deleted.
  • To manage the registry data set using SMS, you must wait until SMS has fully initialized before starting RTCS.
  • The VSAM LDS cluster must be allocated for use by the RTCS subsystem to back the primary RTCS registry partition using the z/OS Data-In-Virtual (DIV) service. Because it is a VSAM cluster and will be dynamically allocated by the RTCS subsystem address space using only its DSNAME, this library must be cataloged.

To allocate the RTCS Subsystem SYSTEM Registry

  1. Select a VSAM LDS cluster DSNAME for the REGISTRY data set.The low-level index should be REGISTRY, but this is not required. If the DSNAME does not follow the same naming convention that you have used for the POSZRTCS, POSZLINK, and POSZHTML data sets, or the low-level index is not REGISTRY, specify the name of the LDS cluster in the SREGVLDS option of the RTCS Initialization member of Logical PARMLIB.

    You can customize the sample JCL shown in the following figure to allocate a new VSAM LDS back to the RTCS Subsystem SYSTEM Registry. The member OSZINJ80 in the TOSZCNTL target library contains the sample JCL.

    //OSZINJ80 JOB (acct),'ALLOC REGISTRY VLDS',
    //             MSGLEVEL=(1,1),CLASS=A,TIME=1
    //*
    //*  acct      JOB statement accounting information
    //*  yyyyyy    VOLSER on which to allocate .REGISTRY
    //*
    //CREATE  EXEC PGM=IEFBR14
    //*
    //*  Allocate a new VSAM Linear Data Set
    //*  CLUSTER for the RTCS System Registry
    //*
    //REGISTRY  DD DISP=(NEW,CATLG),
    //             VOL=SER=yyyyyy,UNIT=3390,
    //             DSN=SYS2.RTCS.REGISTRY,
    //             RECORG=LS,AMP=AMORG,
    //             SPACE=(4096,(17472,0))
    //*

  2. To allocate the space for the VSAM LDS, determine the space in terms of 4K blocks.

    The minimum required space is 17,472 blocks (68.25 MB), which is equal to 98 cylinders on a 3390. The RTCS Subsystem SYSTEM Registry may not require more than 371 cylinders (260.85 MB) of space, even in very large configurations. For sites that do not run more than one CAS, or they do not run a CAS at all, require 188-cylinder (132.1 MB) space.  Sites that run more than one CAS or that have very large configurations might require 371 cylinders.

  3. Allocate the library using the information that you collected.



 

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