A fix is available
APAR status
Closed as program error.
Error description
VTAM TI00 buffers are stranded after Enterprise Extender hard INOP. TI00 buffers contain ALLC headers with UI frames. Decimal 632 bytes will be stranded for each EE line. Sample data in TI00 buffer will contain ALLC_1483_HDRBASE: FEFE03094C8070
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All using Enterprise Extender connections. * **************************************************************** * PROBLEM DESCRIPTION: ECSA TI00 buffer pool growth after * * Enterprise Extender hard INOP. * **************************************************************** * RECOMMENDATION: * **************************************************************** The problem is summarized as follows: 1) Enterprise Extender is active with thousands of active connections. 2) In this case, high CPU conditions caused dispatching issues leading to an ECSA spike. 3) The available ECSA was temporarily exhausted resulting in an INOP occurring on the EE IUTSAMEH connections to the TCP/IP stack. IST1578I HARD INOP DETECTED FOR IUTSAMEH BY ISTTSC89 CODE = 0 IST1683I HPR/IP PORT FAILURE: ID = XCAEE STATUS = 80100045 4) The IUTSAMEH INOP results in an INOP for each active EE line. IST259I INOP RECEIVED FOR LNIP1 CODE = 02 5) After the CPU issues were resolved, and the XCA major node reactivated, ECSA was still higher than normal. 6) Analysis of a dump revealed that thousands of TI buffers were stranded. The content of the TI buffer contained the hex string: x'FEFE03094C8070' (ALLC_1483_HDRBASE). These are buffers preallocated for each EE connection in the event an error occurs (i.e. timeout condition). 7) The hard INOP experienced in this outage resulted in the code that normally frees these buffers to be bypassed. This results in on lost TI buffer for each line that has an active EE connection. For large configurations with 1000s of lines, this could lose a significant number of buffers during a hard INOP, potentially exhausting ECSA over time.
Problem conclusion
ISTTSCCN - Segment CLEANAU has been modified to free the LDLCB_INOP_PTR if it exists. ISTAUCLA - Included for maintenance purposes.
Temporary fix
********* * HIPER * *********
Comments
APAR Information
APAR number
OA28587
Reported component name
VTAM V4 MVS/ESA
Reported component ID
569511701
Reported release
190
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt
Submitted date
2009-04-09
Closed date
2009-04-23
Last modified date
2009-07-01
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UA47005 UA47006 UA47007 OA28883
Modules/Macros
ISTAUCLA ISTTSCCN
Fix information
Fixed component name
VTAM V4 MVS/ESA
Fixed component ID
569511701
Applicable component levels
R1A0 PSY UA47005
UP09/06/10 P F906
R180 PSY UA47006
UP09/06/10 P F906
R190 PSY UA47007
UP09/06/10 P F906
Fix is available
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Document Information
Modified date:
01 July 2009