OS/390 Parallel Sysplex Configuration, Volume 2: Cookbook

A.1.6 CD14 (CICS/ESA Log Stream and CF Sizing Migration Utility)

If you are migrating to CICS TS for OS/390 from CICS/ESA V4.1 or CICS V3.3, you

may need to set up your logger environment to use a CF for the first time.

DFHLSCU is a migration utility that allows you to define the CF structures you

require for CICS TS for OS/390, based on your CICS/ESA V4.1 or CICS V3.3

journaling activity. It examines CICS/ESA V4.1 or CICS V3.3 journal data sets,

and produces a report containing recommended values for:

AVGBUFSIZE - the average buffer size of a log stream structure. It is

important that the AVGBUFSIZE value reflects as accurately as possible the

real size of most log blocks written to the structure. This leads to efficient

use of the space in the CF and minimum DASD off-loading frequency. You

define this attribute in your DEFINE STRUCTURE jobs.

INITSIZE - the initial amount of space to be allocated for the log stream

structure in the CF. You define this attribute in your CFRM policy.

SIZE - the maximum size of the log stream structure in the CF. You define

this attribute in your CFRM policy.

STG_SIZE - the size of the staging data set for the log stream. You define

this attribute in your DEFINE LOGSTREAM jobs.

LOWOFFLOAD - the point in the CF, as a percentage of space consumed,

where the system logger stops off-loading data from the log stream to log

stream DASD data sets. You define this attribute in your DEFINE

LOGSTREAM jobs.

To obtain the CD14 package, IBM representatives may execute the following

command:

TOOLS SENDTO WINVMB TOOLS TXPPACS GET CD14 PACKAGE

Or, the package may be obtained from the Internet at URL:

http://www.software.ibm.com/ts/cics/txppacs

166

Parallel Sysplex Configuration, Volume 2: Cookbook