2617033 - SUM comments out PHYS_MEMSIZE; ERROR => shmget (12: Not enough space)

• While performing an upgrade using Software Update Manager (SUM) on a system with multiple SIDs, an error occurs during the phase MAIN_SWITCH/STARTSAP_TRANS.
• The PHYS_MEMSIZE parameter is set to a specific value to limit each SID from using up all of the system's resources.
• The dispatcher process fails to start, the error reported by SUM has an output similar to:
• In SAPup.ECO:

• 2 name: disp+work
  2 description: Dispatcher
  2 dispstatus: YELLOW
  2 textstatus: Request handling without progress
  2 starttime: <time>
  2 elapsedtime: 0:04:59
  2 pid: <pid>

• In dev_wN logs (N being a number), you can see a similar error message:

• I *** ERROR => shmget(10006,80530636800,2016) (12: Not enough space) [shmux.c 1529]

• You also see in the SUM log MODPROF_TRANS.LOG:

• 2 ETQ399 Commenting out key 'PHYS_MEMSIZE' value '2048'.

• Checking the central instance profile, you see that the PHYS_MEMSIZE parameter is commented out by SUM:

• # *** TEMPORARY 740 CHANGE ***
  #PHYS_MEMSIZE = 2048

  # *** TEMPORARY 740 CHANGE ***

• Why is SUM commenting out this value?

• SAP NetWeaver
• Kernel >= 740

KBA , BC-UPG-TLS-TLA , Upgrade tools for ABAP , Problem