Performing A Rolling Reboot; Starting And Stopping Processes; Tuning File Serving Nodes And Storeall Clients - HP StoreAll 9730 Administrator's 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 StoreAll HA is enabled. See
(page 49) and
creating standby 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 StoreAll 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 a StoreAll client, use the following command:
/etc/init.d/ibrix_client [start | stop | restart | status]

Tuning file serving nodes and StoreAll clients

Typically, HP Support sets the tuning parameters on the file serving nodes during the cluster
installation and changes should be needed only for special situations.
CAUTION:
environments. Because changing parameter values can alter file-system performance, HP
recommends that you exercise caution before implementing any changes, or do so only under the
guidance of HP technical support.
Host tuning changes are executed immediately for file serving nodes. For StoreAll clients, a tuning
intention is stored in the Fusion Manager. When StoreAll 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 StoreAll 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.
1 18 Maintaining the system
"Configuring High Availability on the cluster" (page 54)
The default values for the host tuning parameters are suitable for most cluster
"Configuring virtual interfaces for client access"
for more information about