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
“Monitoring the status of file serving nodes” (page 102)
.
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
IMPORTANT:
On the X9720 platform, the ibrixpwr iLO user must be created on each node
before the cluster HA can be fully functional. Enter the following command on each cluster node
to create an iLO user with the username
ibrixpwr
and with the password
hpinvent
:
ibrix_ilo -c -u ibrixpwr -p hpinvent
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.
On the GUI, select
Servers
from the Navigator.
Click
High Availability
to start the wizard. Typically, backup servers are configured and server HA
is enabled when your system is installed, and the Server HA Pair dialog box shows the backup
pair configuration for the server selected on the Servers panel.
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.
Configuring High Availability on the cluster
55
