IY59779: DCR TO INCREASE CONNECTIONS LIMIT TO EMSV

A fix is available

 

APAR status

• Closed as program error.

Error description

• If a client (such as Oracle) exceeds the number of connections
  to emsvcs (haemd), this error will be seen in the emsvcs log:
      2521-027 Socket connection type C rejected, too many open
      descriptors.
  haemd has gone through several upgrades of maximum connection
  limits, the most recent being to 1500, but several Oracle
   customers are finding their large databases are exceeding that.
  This APAR is to implement a design change to allow a higher
  number of connections based on some type of system admin-
  defined variable or file, with a boundary of 7000 (for now).
  

Local fix

• There are a couple workarounds for this, all of which involve
  the configuration of Oracle, so Oracle support should be
  consulted for how to implement and which are appropriate for a
  given customer:
  1) Changing the Database from Dedicated to Multi-threaded
     will reduce the number of connections made to emsvcs.
  2) Oracle can also be configured to connect only to grpsvcs
     (hagsd) instead of emsvcs.
  

Problem summary

• Currently haemd allows only 1500 client connections.  If
  this limit is exceeded, additional connections can not be
  made and messages similar to the following will be
  written to /var/ha/log/em.default.partition:
  Fn=../../../../../src/rsct/pem/emdaemon/emd_cci.c,
          SID=1.28,L#=259  Thu Sep 16 16:01:48 2004
  haemd(xxxx): 2521-027 Socket connection type C rejected,
               too many open descriptors.
  

Problem conclusion

• The environment variable EM_FD_MAX has been introduced.
  This variable can be set to a maximum of 7000 to increase
  the number of client connections to haemd.  The default
  number of connections is still 1500.  If haemd is
  restarted after the new environment variable takes effect,
  information regarding the highest file descriptor allowed
  for client connections is displayed in the lssrc -ls
  haem output, following the display of the highest file
  descriptor in use.  The highest file descriptor allowed for
  client connections is 25 less than the value of EM_FD_MAX
  
  Sample output included in lssrc -ls haem:
  Highest file descriptor in use is 11
  
  Highest file descriptor allowed for client connections
  is 3975
  

Temporary fix

Comments

APAR Information

• APAR number

  IY59779

• Reported component name

  RSCT/RMC FOR CS

• Reported component ID

  5765F07AP

• Reported release

  234

• Status

  CLOSED PER

• PE

  NoPE

• HIPER

  NoHIPER

• Submitted date

  2004-08-02

• Closed date

  2004-09-22

• Last modified date

  2004-11-01

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  U800819 U800820 U800821

• Fixed component name

  RSCT/RMC FOR CS

• Fixed component ID

  5765F07AP

Applicable component levels

• R234 PSY U800821

     UP04/11/01 I 1000

PTF to Fileset Mapping

• U801111 2.3.5.0

• U801112 2.3.5.0

• U801108 2.3.5.0

• U800820 2.3.4.1

• U800821 2.3.4.1

• U800819 2.3.4.1