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Moving a Unit from One Controller to Another
www.3ware.com 
57
Launch the Macintosh Disk Utility, select the unit, and click the 
Unmount
 button the toolbar, or select the icon for the unit on the desktop 
and drag it to the trash. 
This step is very important.
 If a unit is not unmounted and you remove 
it, it is the equivalent of physically yanking a hard drive out from under 
the operating system. You could lose data, the system could hang, or the 
controller could reset. 
3
In 3DM, choose 
Management > Maintenance
.
4
In  the 
Unit Maintenance
 table on the Maintenance page, select the unit 
you want to remove and click 
Remove Unit
.
5
When a message asks you to confirm, click OK.
The unit number and information is removed from the 
Maintenance
 page 
in 3DM.
The operating system is notified that the unit was removed. 
You can now physically remove the drives and move them to another 
controller. 
If you change your mind and want to reuse the drives and unit on the 
current controller, click 
Rescan Controller.
Moving a Unit from One Controller to Another
After you have configured a unit on a 3ware 9590SE controller, you can move 
it to a different 3ware 9590SE controller, and retain the configuration on the 
new controller. This is referred to as “array roaming.” 
When connecting the unit to the new controller, you do not have to physically 
connect the drives to the same ports to which they were connected on the 
previous controller. The firmware will still recognize the unit. This feature is 
referred to as “disk roaming.”
3DM includes two features that help you move a unit without powering down 
the system, allowing you to hot-swap the unit. The Remove Unit feature lets 
you prepare a unit to be disconnected from the controller, and the Rescan 
feature checks the controller for drives that are now connected, and updates 
the 3DM screens with current information. For details, see “Removing a 
Unit” on page 56
 and “Rescanning the Controller” on page 60
                                      
Note: 
Moving a unit to another controller while the unit is in the migration state is 
supported with one restriction. If the unit was in the middle of the migration process 
and the controller was shutdown uncleanly, the unit cannot be moved to another 
controller until the unit has recovered from the unclean shutdown.