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Chapter 3: Basic System Operations
Converting to HA
48
Initiating a Graceful System Failover
During StorNext 5 release 5.0 or later upgrades, the Metadata Appliance
fails over once. Because of this single failover, the MDC node originally
operating as primary is set as the secondary after the upgrade. This
procedure provides the steps necessary to set the MDC nodes back to
the system state prior to the upgrade for this scenario.
To initiate the failover of a Metadata Appliance after converting to HA or
any time a failover is desired:
1 Open an SSH connection to the MDC node operating as the
primary.
2 Login to the command line of the primary MDC node.
• User: stornext
• Password: (the customer should have the password for the
stornext account)
3 Type sudo rootsh to gain root user access.
4 Enter the password a second time.
5 Confirm that the MDC node is operating as the primary by entering
the following at the command line:
snhamgr -m status
6 Verify the output is (bold used for clarification):
:default:primary:default:running:
7 On the MDC node operating as the primary, initiate an HA failover
to the MDC node operating as the secondary.
service cvfs stop
8 Wait until the secondary MDC node becomes the primary, and
leave your SSH connection to this node open. (Time may vary.)
9 Open an SSH connection to the MDC node now operating as the
primary.
StorNext M330 Metadata Appliance Hardware Guide
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