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DB2 - Problem description

Problem IC71894 Status: Closed

MOUNT_STOP SCRIPT MAY HANG IF THERE ARE MULTIPLE FS ON THE SAME VG

product:
DB2 FOR LUW / DB2FORLUW / 950 - DB2
Problem description:
In an integrated HA environment, if there are multiple 
filesystems exist on the same vg on AIX systems, the TSA move 
request may hang. TSA move will call the mountV9x_stop.ksh 
script on all the mount points in parallel. 
 
In the mountV9x_stop.ksh script, umount and varyoffvg commands 
are issued in a loop until varyoffvg is successful. 
 
In a scenario where there are multiple fs on the same vg, one 
mountV9x_stop.ksh script may be calling varyoffvg while the 
other mountV9x_stop.ksh may be issuing lslv prior to a umount 
attempt. Since varyoffvg is being invoked in a loop, this will 
block the lslv calls. This subsequently blocks the lslv, umount 
code path in the rest of the mountV9x_stop.ksh scripts, so those 
mount points are still mounted. This in turn causes varyoffvg 
call to fail. 
 
This race condition is sometimes seen in an environment where 
there are over 4 filesystems per vg. 
 
During this scenario, any lslv or lsvg command will hang.
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* Integrated HA solution user. (High availability feature with * 
* SA MP used)                                                  * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See error description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Apply DB2 V9.5.0.8.                                          * 
****************************************************************
Local Fix:
No known workaround. Please contact with the IBM db2support.
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
Apply DB2 V9.5.0.8.
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
14.10.2010
30.06.2011
30.06.2011
Problem solved at the following versions (IBM BugInfos)
9.5.0.8
Problem solved according to the fixlist(s) of the following version(s)
9.5.0.8 FixList
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