Installing DAB

DAB is managed as a subsystem by DSSM (Dynamic SubSystem Management).

DAB V21.0 can execute under BS2000 V21.0A or higher.

The DAB subsystem consists of the following delivery units:

• Subsystem catalog
  The subsystem catalog was generated from the subsystem declaration file by SSCM. It contains, among others, references to the LMS module library, the REP file, the SDF syntax file and the message file for DSSM.

• LMS module library
  DSSM loads DAB from the LMS module library. The module library contains exactly one link and load module (LLM).

• REP file for object corrections (created from the RMS delivery unit)

• Message file with message and help texts

• SDF syntax file
  The SDF syntax file contains the syntax of DAB commands. The commands can only be entered by systems support staff and require the TSOS or SW-MONITOR-ADMINISTRATION privileges (see also the relevant commands in chapter "Commands"). The syntax file is activated at subsystem startup as the subsystem syntax file.

• Subsystem initialization file
  The subsystem initialization file SYSSSI.DAB.<version> contains the global parameters of the subsystem which mainly influence the caching algorithm and thereby also the performance behavior. These parameters should normally not be modified at all or, in exceptional cases, be modified by the Service.

  Exception

  Parameters for defining the duration of the statistics interval for the statistical data output by /SHOW-DAB-CACHING.

  The specification of the statistics interval for the cumulative data that is output using /SHOW-DAB-CACHING is carried out using the parameter PERIOD-OF-STATISTICS-INTERVAL. The possible values lie between 1 and 8784 and the unit used is hours. This means that you can set an interval of anything between an hour and a year. The default value for the interval is 24 hours. After the interval has elapsed, the statistics data for the cache area is reset and counting of I/O operations starts at zero again. With a default value of 24 hours, the resetting of the statistics data is carried out at 00:00 local time, for larger values, the reset is carried out 00:00 of the specified following day (rounded up).

• Structure and installation file for installation with IMON
  This file contains the logical path names of the subsystem files which are supplied with DAB.

Files required for installing DAB (<ver>= 210 for DAB V 21.0):

SYSLNK.DAB.<ver>	Module library (/390 servers)
SKMLNK.DAB.<ver>	Module library (x86 servers)
SYSRMS.DAB.<ver>	RMS delivery unit (for creating the REP loader)
SYSREP.DAB.<ver>	REP loader (IMON standard installation created)
SYSSSC.DAB.<ver>	Subsystem catalog
SYSSDF.DAB.<ver>	Syntax file
SYSMES.DAB.<ver>	Message file
SYSSSI.DAB.<ver>	DAB subsystem initialization file
SYSSII.DAB.<ver>	Structure and installation file for installation with IMON