APAR status
Closed as program error.
Error description
Some users deploying an MQ Appliance have reported intermittent reboots of a running appliance. No errors are reported in the system logs when the appliance restarts. Queue managers on the affected appliance that are part of an HA pair fail over to the standby instance as expected during the shutdown phase of the reboot.
Local fix
The watchdog timer can be disabled by running a remote ipmitool request to the affected appliance@ ipmitool -L operator -I lanplus -H <ipmi-channel-IP> -U <ipmi_user> -P <ipmi_password> mc watchdog off When run successfully, the command output will report: Watchdog Timer Shutoff successful -- timer stopped Please note that if the watchdog timer is disabled, then the IBM MQ Appliance firmware may falsely report an intrusion detection warning if the connection is lost between the low-level firmware and the rest of the system. The watchdog timer can be re-enabled by running the following remote command: ipmitool -L operator -I lanplus -H <ipmi-channel-IP> -U <ipmi_user> -P <ipmi_password> mc reset warm
Problem summary
**************************************************************** USERS AFFECTED: Users of the IBM MQ Appliance Platforms affected: MultiPlatform **************************************************************** PROBLEM DESCRIPTION: The IBM MQ Appliance low-level firmware makes use of a "watchdog timer" to monitor the state of the system, and restart the appliance if an unrecoverable system state is detected. An error in the low level firmware meant that it was possible for the low-level firmware's watchdog timer to lose communication with the rest of the system, and incorrectly determine that the system had entered an unrecoverable state, triggering a reboot of the appliance.
Problem conclusion
The low-level firmware within the MQ appliance has been updated to prevent this loss of communication, in order to maintain normal operation of the watchdog timer. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v8.0 8.0.0.5 The latest available maintenance can be obtained from 'WebSphere MQ Recommended Fixes' http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037 If the maintenance level is not yet available information on its planned availability can be found in 'WebSphere MQ Planned Maintenance Release Dates' http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309 ---------------------------------------------------------------
Temporary fix
Comments
APAR Information
APAR number
IT15737
Reported component name
IBM MQ APPL M20
Reported component ID
5725S1400
Reported release
800
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2016-06-15
Closed date
2016-07-14
Last modified date
2017-12-04
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
IBM MQ APPL M20
Fixed component ID
5725S1400
Applicable component levels
R800 PSY
UP
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Document Information
Modified date:
04 December 2017