Performing A Rolling Reboot; Starting And Stopping Processes; Tuning File Serving Nodes And X9000 Clients - HP IBRIX X9720 System Administrator Manual

Performing a rolling reboot

The rolling reboot procedure allows you to reboot all file serving nodes in the cluster while the
cluster remains online. Before beginning the procedure, ensure that each file serving node has a
backup node and that X9000 HA is enabled. See
(page 34) and
backup pairs, where each server in a pair is the standby for the other.
Use one of the following schemes for the reboot:
Reboot the file serving nodes one-at-a-time.
Divide the file serving nodes into two groups, with the nodes in the first group having backups
in the second group, and the nodes in the second group having backups in the first group.
You can then reboot one group at-a-time.
To perform the rolling reboot, complete the following steps on each file serving node:
1. Reboot the node directly from Linux. (Do not use the "Power Off" functionality in the GUI, as
it does not trigger failover of file serving services.) The node will fail over to its backup.
2. Wait for the GUI to report that the rebooted node is Up.
3. From the GUI, failback the node, returning services to the node from its backup. Run the
following command on the backup node:
ibrix_server -f -U -h HOSTNAME
HOSTNAME is the name of the node that you just rebooted.

Starting and stopping processes

You can start, stop, and restart processes and can display status for the processes that perform
internal X9000 software functions. The following commands also control the operation of PostgreSQL
on the machine. The PostgreSQL service is available at /usr/local/ibrix/init/.
To start and stop processes and view process status on the Fusion Manager, use the following
command:
/etc/init.d/ibrix_fusionmanager [start | stop | restart | status]
To start and stop processes and view process status on a file serving node, use the following
command. In certain situations, a follow-up action is required after stopping, starting, or restarting
a file serving node.
/etc/init.d/ibrix_server [start | stop | restart | status]
To start and stop processes and view process status on an X9000 client, use the following command:
/etc/init.d/ibrix_client [start | stop | restart | status]

Tuning file serving nodes and X9000 clients

The default host tuning settings are adequate for most cluster environments. However, HP Support
may recommend that you change certain file serving node or X9000 client tuning settings to
improve performance.
Host tuning changes are executed immediately for file serving nodes. For X9000 clients, a tuning
intention is stored in the Fusion Manager. When X9000 software services start on a client, the
client queries the Fusion Manager for the host tunings that it should use and then implements them.
If X9000 software services are already running on a client, you can force the client to query the
Fusion Manager by executing ibrix_client or ibrix_lwhost --a on the client, or by
rebooting the client.
You can locally override host tunings that have been set on clients by executing the ibrix_lwhost
command.
"Cluster high availability" (page 38)
"Configuring virtual interfaces for client access"
for more information about creating standby
Performing a rolling reboot 81