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DB2 - Problem description

Problem IC70546 Status: Closed

DB2 INSTANCE ON SOLARIS CAN BECOME INACCESSIBLE AND ENTER A
HUNG STATE.

product:
DB2 FOR LUW / DB2FORLUW / 950 - DB2
Problem description:
DB2 instance on solaris can become inaccessible and 
enter a hung state. 
 
After a period of activity a DB2 instance became inaccessible 
and entrered a hung state. 
 
 
Looking at the DB2 threads they can been seen to be on async I/O 
requests.  However the Solaris async I/O worker threads all 
appear to be idle and waiting on requests. 
 
 
This can be due to a solaris defect 6972029 close(-1) cancels 
all aio for all open file descriptors.
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* Solaris                                                      * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* DB2 instance on solaris can become inaccessible andenter a   * 
* hung state.After a period of activity a DB2 instance         * 
* becameinaccessibleand entered a hung state.Looking at the    * 
* DB2 threads they can been seen to be on asyncI/Orequests.    * 
* However the Solaris async I/O worker threads allappear to be * 
* idle and waiting on requests.This can be due to a solaris    * 
* defect 6972029 close(-1)cancelsall aio for all open file     * 
* descriptors.                                                 * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 v9.5 Fixpak 7 or higher                       * 
****************************************************************
Local Fix:
Disable ASYNC IO 
db2set DB2LIOAIODISABLED=true 
then db2stop & db2start instance.
available fix packs:
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
First Fixed in DB2 v9.5 Fixpak 7
Workaround
not known / see Local fix
BUG-Tracking
forerunner  : APAR is sysrouted TO one or more of the following: IC70549 IC71454 
follow-up : 
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
16.08.2010
15.11.2010
15.11.2010
Problem solved at the following versions (IBM BugInfos)
9.5.
Problem solved according to the fixlist(s) of the following version(s)
9.1.0.7 FixList
9.5.0.7 FixList
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