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DB2 - Problem description

Problem IC74760 Status: Closed

FOR TABLESPACES WITH "NO FILE SYSTEM CACHE" ENABLED AND NO CONCU
RRENT I/O AVAILABLE, DIRECT I/O WILL NOT ALWAYS BE ATTEMPTED.

product:
DB2 FOR LUW / DB2FORLUW / 950 - DB2
Problem description:
When tablespaces are created with the "no file system cache" 
attribute, then DB2 will attempt to use Concurrent I/O ( CIO ) 
on the containers of that tablespace. In some cases, when CIO is 
not available on the system, then DB2 will incorrectly not 
attempt to use Direct I/O ( DIO ) even though that may be 
available in some cases. 
DB2 will instead fall back to using the file system cache for 
I/O on those tablespaces. 
This could have an impact on performance.
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* ALL                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* I/O performance may be suboptimal due to DB2 not choosing    * 
* Direct I/O as an access method even though it may be         * 
* available.                                                   * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 Version 9.5 and Fix Pack 8                    * 
****************************************************************
Local Fix:
n/a
available fix packs:
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 DB2 Version 9.5 and Fix Pack 8
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
01.03.2011
21.07.2011
21.07.2011
Problem solved at the following versions (IBM BugInfos)
9.5.
Problem solved according to the fixlist(s) of the following version(s)
9.5.0.8 FixList
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