A server for which Auto-Recovery is enabled will be automatically switched over to its spare server if Resource Coordinator VE detects both a failure from the server hardware and determines that its physical OS (or VM host) has stopped.
Detecting hardware failures from servers
A hardware failure can be detected by an "Error" level SNMP trap failure notification sent to the admin server from either the ServerView Agent or the server management unit. Alternatively, Resource Coordinator VE can detect a failure by periodically polling the status of each managed server.
Detectable hardware failures
CPU faults
Memory errors
Fan failures
Temperature abnormalities
Detecting that a physical OS (or VM host) has stopped
A physical OS (or VM host) is seen to have stopped abnormally when the following conditions are met:
PRIMERGY BX servers and PRIMERGY Partition Model servers
An abnormal server status is obtained from a server management unit, and it is not possible to communicate with either the ServerView Agent or the Resource Coordinator VE agent.
For rack mount and tower servers
Communication using the ping command is unavailable
Note
Notification of hardware failures on rack mount servers and tower servers is only detected by an SNMP trap.
Auto-Recovery is not triggered on servers that are in maintenance mode.
Even if a hardware failure is detected, Auto-Recovery will not be triggered if no response is received from the target server. In such cases, shutting down or restarting the server will temporarily stop the operating system, triggering an automatic switchover as the conditions for Auto-Recovery will be met. Under such conditions, automatic switchovers can be prevented by setting the server to maintenance mode before shutdown or restart.
For PRIMERGY Partition Models, Auto-Recovery does not take place under the following conditions.
The Reserved SB is assigned to an active server
The active server is placed into maintenance mode
Also, spare servers which are placed into maintenance mode will be skipped, and switchover will be applied to different spare servers.
