ExpressCluster X 2.0 for Windows Reference Guide - Nec

Chapter 12 Troubleshooting
When activating or deactivating group resources fails
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If any error is detected in activation of a group resource, detailed error information is logged in
the alert and event log. See “Detailed information in activating and deactivating group resources”
and examine the logs to find the cause of the error and take appropriate action for it.
When a monitor resource error occurs
If a monitor resource detects any error, detailed information on error is logged in the alert and
event logs. See “Detailed info of monitor resource errors” and examine the logs to find the cause
of the error and take appropriate action for it.
When a heartbeat time-out occurs
Possible causes of heartbeat time-out between servers are listed below:
Cause Solution
Disconnection of LAN cables Check that you can send packets with the ping
command.
Recovering from failure of one server
If the automatic recovery mode is not set in Cluster Properties, the server that you have
removed errors and restarted is in the Suspension (Isolated) status. To recover the server to the
normally functioning cluster from this status, use the WebManager or the clpcl command.
If the Replicator is used, data between the disks that form a mirror set becomes inconsistent.
However, by recovering the server, the mirror will be automatically rebuilt, and the data will
become consistent.
To recover the server by the WebManager, see “Operating a cluster by using the WebManager”
of Chapter 1, “Functions of the WebManager” of Section I of this guide.
To recover the server by the clpcl command, see “Operating the cluster” of Chapter 4,
“ExpressCluster command reference” of Section I of this guide.
Recovering from failure of both servers
When Off is selected for Auto Return on the Auto Recovery tab in Cluster Properties, when
all the servers shut down by failures such as a hardware failure, after starting them up, they are
removed from the cluster. Recover all the servers by using the WebManager or the clpcl
command.
Right after recovering the servers, all the groups are stopped. Start all the groups. If the
Replicator is used, the mirror will be automatically built again by starting the groups, and the
data will become consistent.
ExpressCluster X 2.0 for Windows Reference Guide