Apple Xsan 2 (Third Edition) - Manual (Page 90)

From the Command Line
You can also find out which volumes are hosted by a controller using the
cvadmin
select command in Terminal. For more information, see the cvadmin man page or
“Viewing or Changing Volume and Storage Pool Settings (cvadmin)” on page 111.
Changing a Controller’s IP Address
Follow these instructions to change the IP address of an Xsan metadata controller.
WARNING: To avoid losing data on volumes hosted by the metadata controller,
you must have a standby controller available for each volume.
To change a metadata controller’s IP address:
1 Make sure your standby controller is ready.
To check the status of the standby controller, open Xsan Admin and select Computers
in the SAN Assets list.
2 In the Xsan Admin Computers pane, select the controller and choose “Remove
Computer from SAN” from the Action (gear) pop-up menu.
3 Change the computer’s IP address in the Network pane of System Preferences.
4 Restart the computer.
5 With its new address, add the computer back to the SAN as a controller.
In Xsan Admin, select Computers in the SAN Assets list and click the Add (+) button.
If you want to switch control of a volume hosted by the standby controller back to
the controller with the new IP address, select the volume in the Volumes pane of Xsan
Admin and choose “Force failover” from the Action (gear) pop-up menu.
You can also force the switch from the command line by entering:
$ sudo cvadmin -e "fail volume"
Replace volume with the name of the Xsan volume.
Converting a Controller to a Client
If you no longer want a computer to act as a metadata controller for SAN volumes,
you can demote the controller to a SAN client.
To convert a controller to a client:
In Xsan Admin, select Computers in the SAN Assets list, select the controller in the list,
m
and choose Make Client from the Action (gear) pop-up menu.
90 Chapter 6 Managing Metadata Controllers