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2191098 - AIX. KRNL74x invalid argument ES/SHM_MAX_PRIV_SEGS=n. Valid range is 1..nn

Symptom

SAP instance does not start up. The dispatcher goes down in few seconds. (In most cases, during / after UPGRADE)

The developer trace file dev_disp.new logs the following messages:

EmInit: MmSetImplementation( 2 ).
MM global diagnostic options set: 0
*** INFO SHM 51 in POOL 10 34179 KB estimated 7840 KB real (-26339 KB -78 %)
EM/TOTAL_SIZE_MB = 250000
*** ERROR => SHM2_EsInit: invalid argument ES/SHM_MAX_PRIV_SEGS=n. Valid range is 1 ... 8d [esuxshm2.c 1373]
*** ERROR => DpEmInit: EmInit failed (1) [dpInit.c 1535]
*** ERROR => DpMemInit: DpEmInit (-1) [dpInit.c 1399]
*** DP_FATAL_ERROR => DpSapEnvInit: DpMemInit
*** DISPATCHER EMERGENCY SHUTDOWN ***


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Environment

  • The OS is AIX. If you are on IBMi, please refer SAP note 1998233.
  • The kernel release level is 74x.

Keywords

ES/SHM_MAX_PRIV_SEGS, ES/SHM_PROC_SEG_COUNT, ES/SHM_MAX_SHARED_SEGS, ERROR => SHM2_EsInit: invalid argument ES/SHM_MAX_PRIV_SEGS=. Valid range is 1 ... , KBA , BC-CST-MM , Memory Management , BC-OP-AIX , IBM AIX , Problem

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