NEC S2900 User Manual page 69

(1) Power check (when the disk array unit is off-powered)
Note
- when adding a DE port, the disk array unit must be powered off.
While the disk array unit is powered off and the [BAT LED] is on, the cache memory may still contain
data that needs to be written into the disk drive. If there is data remaining in the cache memory, press
the SHUTDOWN switch to write the data from the cache memory, and then turn the disk array power
off.
If you turn off the power switch of the disk array unit before pressing the SHUTDOWN
switch, the cache memory in the array controller still contains data that is to be written
into the disk drive. If you add a new DE port in this state, the data remaining in the
cache memory will be lost.
Perform the procedure explained in Section 7.2 "(2) Notes on turning off the AC
power" so as not to leave any unwritten data in the cache memory of the array
controller. After that, add the new DE port.
(2) Disconnection of host unit (for offline addition)
Disconnect the host unit that is connected to the controller to be added.
(3) Removal of cables
Remove all the cables connected to the controller. Write down the connections between the cables to
be removed and the mating connectors.
(4) Removal of controller
Loosen a screw securing the ejector of the target controller, open the ejector pulling it by 90º, and then
pull out the controller. (When the controller is pulled out, the protection shutter in the unit closes and it
is locked.)
Be careful as this may be hot.
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