f19dd0498f
The maintenance system implements a high availability (HA) feature designed to detect the simultaneous heartbeat failure of a group of hosts and avoid failing all those hosts until heartbeat resumes or after a set period of time. This feature is called Multi-Node Failure Avoidance, aka MNFA, and currently has the hosts threshold set to 3 and timeout set to 100 secs. This update implements enhancements to that existing feature by making the 'number-of-hosts threshold' and 'timeout period' customer configurable service parameters. The new service parameters are listed under platform:maintenance which display with the following command > system service-parameter-list mnfa_threshold: This new label and value is added to the puppet managed /etc/mtc.ini and represents the number of hosts that are required to fail heartbeat as a group; within the heartbeat failure window (heartbeat_failure_threshold) after which maintenance activates MNFA Mode. This update changes the default number of failing hosts from 3 to 2 while allowing a configurable range from 2 to 100. mnfa_timeout: This new label and value is added to the puppet managed /etc/mtc.ini. While MNFA mode is active, it will remain active until the number of failing hosts drop below the mnfa_threshold or this timer expires. The MNFA mode deactivates on the first occurance of either case. Upon deactivation the remaining failed hosts are no longer treated as a failure group but instead are all Gracefully Recovered individually. A value of zero imposes no timeout making the deactivation criteria solely host based. This update changes the default 100 second timer to 0; no-timeout while permitting valid a times range from 100 to 86400 secs or 1 day. DocImpact Story: 2003576 Task: 24903 Change-Id: I2fb737a4cd3c235845b064449949fcada303d6b2 Signed-off-by: Eric MacDonald <eric.macdonald@windriver.com> |
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