A fix is available
APAR status
Closed as program error.
Error description
TCPIP caches storage for optimal reuse and optimizes the CPU overhead of obtaining and releasing storage by dividing larger blocks of storage into smaller areas. This dividing process is optimal for CPU usage but can lead to a larger footprint of storage. This caching and dividing effect extends to storage obtained from CSM which also divides larger blocks into smaller blocks for CPU efficiency.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: * * All users of the IBM Communications Server for z/OS Version * * 2 Release 1 IP * **************************************************************** * PROBLEM DESCRIPTION: * * The TCP/IP usage of CSM can cause fragmentation in the CSM * * buffers leading to CSM storage that is free but that cannot * * be reused. * **************************************************************** * RECOMMENDATION: * * Apply the PTF * **************************************************************** When TCP/IP creates images of a CSM buffer, the CSM buffer cannot be reused until all the images have been released. The release of some of the images, but not all of the images, causes the storage represented by the released images to become unusable until all of the images are released.
Problem conclusion
The TCP/IP storage functions have been updated to recognize when CSM fragmentation is occurring and to release the CSM buffers causing the fragmentation.
Temporary fix
Comments
APAR Information
APAR number
PI82517
Reported component name
TCP/IP MVS
Reported component ID
5655HAL00
Reported release
210
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2017-06-02
Closed date
2017-06-12
Last modified date
2017-08-07
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI47950 UI47951
Modules/Macros
EZBITSCU EZBIPINB EZBISXES EZBIFOUT EZBTLRDX EZBTCRD EZBITSCS EZBSKDKI EZBITSMT EZBTCUTL EZATESEN EZATENCP EZBTLWRQ EZBIPOUT EZBTLCWK EZBISSHA EZATESDE EZBTCFRD EZBIFBP1
Fix information
Fixed component name
TCP/IP MVS
Fixed component ID
5655HAL00
Applicable component levels
Fix is available
Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.
[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG19M","label":"APARs - z\/OS environment"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"210","Edition":"","Line of Business":{"code":"","label":""}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSCY4DZ","label":"DO NOT USE"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"210","Edition":"","Line of Business":{"code":"","label":""}}]
Document Information
Modified date:
07 August 2017