Digital Equipment StorageWorks UltraSCSI DS-BA370 Series, User Manual

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Operating the UltraSCSI Enclosure
UltraSCSI RAID Enclosure 2–9
Shutting Down the Subsystem
Shutting down the subsystem involves (1) Clearing the cache module and
shutting down the controller. (2) Either turning O
FF
the dc power in an
enclosure (the standby power mode) or turning O
FF
the ac power controllers
(full power shutdown).
Placing the subsystem in the standby power mode disconnects the dc power
from the backplane. The ac power is still applied to the shelf power
supplies. In this mode the EMU alarm control switch now functions as a
standby power switch. To restore the dc power to the backplane requires
pressing the standby power switch on each EMU.
___________________ Caution _____________________
Failure to clear the cache module and shut down the array
controller before removing power will disrupt data transfers.
Therefore, always shut down the array controller as described in
the array controller documentation.
________________________________________________
Turning the subsystem off involves shutting down the array controller and
then turning off the ac power controllers in each enclosure.
Powering down an enclosure always involves shutting down the array
controller and then pressing the PVA standby power switch on an expansion
enclosure.
When there are no expansion enclosures, shut down the array controller and
then press the PVA standby power switch on the master enclosure.