What Happens During A Failover; Configuring Automated Failover With The Ha Wizard - HP StoreAll 8800 Administrator's Manual

What happens during a failover

The following actions occur when a server is failed over to its backup:
1. The Fusion Manager verifies that the backup server is powered on and accessible.
2. The Fusion Manager migrates ownership of the server's segments to the backup and notifies
all servers and StoreAll clients about the migration. This is a persistent change. If the server
is hosting the active FM, it transitions to another server.
3. If NIC monitoring is configured, the Fusion Manager activates the standby NIC and transfers
the IP address (or VIF) to it.
Clients that were mounted on the failed-over server may experience a short service interruption
while server failover takes place. Depending on the protocol in use, clients can continue operations
after the failover or may need to remount the file system using the same VIF. In either case, clients
will be unaware that they are now accessing the file system on a different server.
To determine the progress of a failover, view the Status tab on the GUI or execute the
ibrix_server -l command. While the Fusion Manager is migrating segment ownership, the
operational status of the node is Up-InFailover or Down-InFailover, depending on whether
the node was powered up or down when failover was initiated. When failover is complete, the
operational status changes to Up-FailedOver or Down-FailedOver. For more information
about operational states, see
Both automated and manual failovers trigger an event that is reported on the GUI.
Automated failover can be configured with the HA Wizard or from the command line.

Configuring automated failover with the HA Wizard

The HA wizard configures a backup server pair and, optionally, standby NICs on each server in
the pair. It also configures a power source such as an iLO on each server. The Fusion Manager
uses the power source to power down the server during a failover.
1. Select Servers from the Navigator.
2. Click High Availability to start the wizard. The Server HA Pair window appears. Typically,
backup servers are configured and server HA is enabled when your system is installed, and
the Server HA Pair window shows the backup pair configuration for the server selected on
the Servers panel.
3. If necessary, you can configure the backup pair for the server. The wizard identifies the servers
in the cluster that see the same storage as the selected server. Choose the appropriate server
from the list.
4. The wizard also attempts to locate the IP addresses of the iLOs on each server. If it cannot
locate an IP address, you will need to enter the address when prompted. When you have
completed the information, click Enable HA Monitoring and Auto-Failover for both servers.
"Monitoring the status of file serving nodes" (page
Configuring High Availability on the cluster
83).
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