CSA BELOW THE LINE STORAGE GROWTH or IST562I STORAGE UNAVAILABLE: CSA24 LIMIT

Technote (troubleshooting)


Problem(Abstract)

SUBPOOL SP227 below the line CSA storage usage continually expands. Another symptom of the problem could be IST562I message is issued because the CSA24 storage limit is reached. The storage contains many DLRPL control blocks.
The DLRPL control block identifier is X'50'. The length of the control block is in the second word of the storage header.
Example:
storage header: E3606000 0000025D

DLRPL: 50008000  00000000 03000000  00000000  00000000  05000000 063F0010  01EB0000  ...

Cause

The problem occurs because the hostname resolver is not started, dial connection attempts are being processed for switched physical units, and the PATH definition for the PU contains:
IPRESOLV=255,
REDDELAY=60,
REDIAL=FOREVER,
HOSTNAME=hostname
When the PU is activated and dialed, the dial does not complete because the resolver function is not active.
REDIAL retries the dial each minute, allocating a DLRPL for hostname resolution. A timer waits for four minutes for the resolution to complete due to IPRESOLV. When the timer expires, the resolution process fails, and the DLRPL is freed.
The problem is that four DLRPL control blocks are allocated for each one that is deleted during each four minute interval. The net result is storage use keeps increasing due to an increasing number of DLRPL control blocks. This may be compounded if multiple physical units are being dialed.


Resolving the problem

Actions that can be taken to eliminate the problem:

  • Start the hostname resolver function.
  • Adjust REDDELAY to be greater than IPRESOLV on Enterprise Extender PU PATH definitions.
  • Inactivate the physical units being dialed.

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Document information


More support for:

z/OS Communications Server
All

Software version:

1.4, 1.5, 1.6, 1.7, 1.8, 1.11, 1.12, 1.13, 2.10

Operating system(s):

z/OS

Reference #:

1227192

Modified date:

2012-12-06

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