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A Cross Failover Occurs on the HA VTL

Publication Date:  2015-08-03 Views:  93 Downloads:  0
Issue Description
Product and version: VTL6000 V100R003

A cross failover is a phenomenon where two VTL servers with failover enabled take over services of each other. The failover status of the two VTL servers is both 2-READY. The symptom is:

In the navigation tree of the VTL Console, the icons of the two VTL servers in the failover group are red.
Log in to the two VTL servers using a Secure Shell (SSH) tool. Run the sms command to view the failover status. FailOverStatus of both VTL servers is 2(READY).
Handling Process
1.  In the navigation tree of the VTL Console, right-click one VTL server in the failover group and choose Failover > Stop Takeover Failover-B from the shortcut menu.

2.  In the Virtual Tape Library Console dialog box that is displayed, click Yes. Wait for Failover-B to completely restart.

3.  Run the vtl status and sms commands to check the status of Failover-B.

     Run the vtl status command to display the status of all modules, and the sms command to display the value of FailOverStatus. If vtl status is OK and FailOverStatus is 1 (up), Failover-B successfully recovers.

4.  Right-click the recovered Failover-B VTL server and choose Failover > Stop Takeover Failover-A to recover the other VTL server.

5.  Wait 3 to 5 minutes and then perform 3 to check whether Failover-A recovered.
Root Cause
The failover function is enabled for two VTL servers, for example Failover-A and Failover-B. When Failover-A fails, Failover-B automatically takes over Failover-A's services. Later when Failover-A recovers, Failover-B does not automatically switch services back to Failover-A.

If Failover-B fails at this time, Failover-A cannot take over Failover-B's services. Later when Failover-B recovers, a cross failover occurs on the two VTL servers.