PM63090: Need to set TCP_NODELAY socket option in multitool and db_server

Rational ClearCase Fix Pack 07 (7.1.2.7) for 7.1.2
Rational ClearCase Fix Pack 03 (8.0.0.3) for 8.0
Rational ClearCase Fix Pack 14 (7.1.2.14) for 7.1.2
Rational ClearCase Fix Pack 11 (8.0.0.11) for 8.0
Rational ClearCase Fix Pack 12 (8.0.0.12) for 8.0
Rational ClearCase Fix Pack 15 (7.1.2.15) for 7.1.2
Rational ClearCase Fix Pack 13 (8.0.0.13) for 8.0
Rational ClearCase Fix Pack 16 (7.1.2.16) for 7.1.2
Rational ClearCase Fix Pack 17 (7.1.2.17) for 7.1.2
Rational ClearCase Fix Pack 14 (8.0.0.14) for 8.0
Rational ClearCase Fix Pack 18 (7.1.2.18) for 7.1.2
Rational ClearCase Fix Pack 15 (8.0.0.15) for 8.0
Rational ClearCase Fix Pack 19 (7.1.2.19) for 7.1.2
Rational ClearCase Fix Pack 16 (8.0.0.16) for 8.0
Rational ClearCase Fix Pack 17 (8.0.0.17) for 8.0
Rational ClearCase Fix Pack 18 (8.0.0.18) for 8.0
Rational ClearCase Fix Pack 19 (8.0.0.19) for 8.0
Rational ClearCase Fix Pack 20 (8.0.0.20) for 8.0
Rational ClearCase Fix Pack 21 (8.0.0.21) for 8.0

APAR status

• Closed as program error.

Error description

• TCP ACK delays in multisite syncreplica export results in long
  lock held times.
  

Local fix

Problem summary

• this is to fix a TCP buffer read poll wait issue for multitool
  syncreplica -export process by setting up TCP NO_DELAY option.
  It  is noticed that while talking to DB server,  multitool
  process somehow repeatedly wait for about 40ms to read from TCP
  buffer after several reads.  To suppress this option setting,
  set up an environment variable  CLEARCASE_SUPPRESS_NODELAY
  before running multitool command.
  

Problem conclusion

• A fix is available in ClearCase versions 7.1.2.7 and 8.0.0.3
  

Temporary fix

Comments

APAR Information

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

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

Fix information

• Fixed component name

  CLEARCASE WIN

• Fixed component ID

  5724G2900

Applicable component levels

• R712 PSY

     UP

• R800 PSY

     UP