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DB2 - Problem description

Problem IC62723 Status: Closed

ON AIX THE TCP_NODELAYACK IS NOT BEING CORRECTLY SET IN THE SOCK ET LAYER
BY DB2

product:
DB2 FOR LUW / DB2FORLUW / 950 - DB2
Problem description:
Starting in V95 of DB2, we decided to enable the TCP_NODELAYACK 
option at the socket layer instead of globally at the OS level 
for better performance of network operations between partitions 
when traffic is low.  This APAR is open to address the fact that 
this is not being set correctly.
Problem Summary:
Users Affected: Any using DPF feature across multiple machines 
 
Problem Description: TCP_NODELAYACK is not being set correctly 
at the socket layer which can results in inter-partition 
communication delays 
Problem summary: see above
Local Fix:
As a workaround you can enable TCP_NODELAYACK in the kernel by 
setting it to 1.
available fix packs:
DB2 Version 9.5 Fix Pack 6a for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 10 for Linux, UNIX, and Windows

Solution
Problem was first fixed in Version 9.5 FixPak 6
Workaround
As a workaround you can enable TCP_NODELAYACK in the kernel by 
setting it to 1.
BUG-Tracking
forerunner  : APAR is sysrouted TO one or more of the following: IC62724 
follow-up : 
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
25.08.2009
07.10.2010
07.10.2010
Problem solved at the following versions (IBM BugInfos)
9.5.
Problem solved according to the fixlist(s) of the following version(s)
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