OA38553: DOCUMENT TINYDS PARAMETER. USED TO LIMIT THE MAXIMUM NUMBER OF PAGES ALLOCATED FOR THE CNMCANZ0 DATA SPACE (FOR CANZLOG).

APAR status

• Closed as documentation error.

Error description

• There is an undocumented parameter that can be used to reduce
  the maximum number of pages allocated for CNMCANZ0 data space.
  The parameter is called TINYDS, and would be specified on the
  INITPARM parameter of the _first_ SUBSYS statement containing
  INITRTN(DSI4LSIT). Example syntax of the statement would be:
   SUBSYS SUBNAME(xxxx) INITRTN(DSI4LSIT) INITPARM('TINYDS')
  This parameter limits the data space size to .5G, or 131072
  (decimal) pages, which is one quarter the size of the full
  data space.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of Tivoli NetView for z/OS V6R1.   *
  ****************************************************************
  * PROBLEM DESCRIPTION: After installing NetView V6R1,          *
  *                      auxiliary storage requirements for the  *
  *                      MASTER address space increases by up to *
  *                      2 GB. This space may not have been      *
  *                      planned for, and could cause aux        *
  *                      storage shortage messages. The storage  *
  *                      is for the main Canzlog data space,     *
  *                      CNMCANZ0, which can grow to a full data *
  *                      space size of 2GB.                      *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Main NetView Canzlog dataspace CNMCANZ0 is allocated with the
  potential to grow to 2GB in size, by default, if the system is
  left running long enough. This can cause auxiliary storage
  problems. There is a value that can be specified on the INITPARM
  parameter of the SUBSYS statement for NETVIEW V6R1 in PARMLIB
  member IEFSSNxx. This value is TINYDS, which will limit the
  maximum size of the data space to .5GB (one fourth of the size
  of a full data space). However, this value is not documented.
  

Problem conclusion

• The Tivoli NetView for z/OS V6R1 Installation: Getting
  Started manual (GI11-9443-00) should be changed as follows:
   A new usage note should be added to the section entitled
   IEFSSNxx in Chapter 2, Preparing the MVS System, which should
   read as follows:
     o The initialization routine, DSI4LSIT, allocates a data
       space named CNMCANZ0 where MVS and NetView messages are
       stored, and which wraps when it reaches its maximum size.
       This is the main Canzlog data space, and by default is
       allocated with a full data space size of 2GB. To limit the
       size of the data space to .5GB to reduce auxliliary storage
       requirements, specify the following on the first SUBSYS
       statement that contains INITRTN(DSI4LSIT):
          INITPARM('TINYDS')
       Note that the NetView subsystem initialization routine
       ignores any value specified on INITPARM on a SUBSYS
       statement containing INITRTN(DSI4LSIT) that is not the
       first such statement read by MVS. If both TINYDS and
       LOGFORN are needed, specify both values on the same
       INITPARM, with TINYDS before LOGFORN, separated by a comma,
       as follows:
          INITPARM('TINYDS,LOGFORN')
  .
  After changing the Canzlog data space size (IE:TinyDS parm)
  it will not take effect dynamically, it requires a system IPL.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

Applicable component levels