HP StorageWorks 1510i Modular Smart Array - Manual (Page 58)

disable this_controller|other_controller
Description In a dual-controller system, this command disables one of the controllers to
prepare it for removal. When a controller is disabled, all resources being
processed by that controller are automatically failed over to the remaining
controller. After a controller has been successfully disabled, the LCD panel
displays a message stating that it is safe for that controller to be removed.
Syntax disable this_controller|other_controller [reboot]
Operands this_controller
Disables the controller through which you are accessing the CLI.
other_controller will disable the other MSA controller.
other_controller
Disables the other MSA controller.
reboot
[Optional] Instead of disabling the controller, it will be rebooted.
Example
CLI> disable other_controller
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58 Command reference