NEC S1500, Setup Manual

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IMPORTANT:
„ When the host system is shut down, it writes the remaining
cache data into the disk array unit. The cache data remaining
in this host system is written into the disk array unit. Before
turning OFF the power, confirm that no cache data remains
on the host system and no data remains in the cache memory
on the disk array unit.
„
To check if data remains in the cache memory on the disk
array unit, watch the hard disk drive READY LED after
shutting down the host system. If the hard disk drive
READY LED is flashing, data remains in the cache memory
on the disk array unit. It takes a maximum of about 10
minutes to write the remaining data from the cache memory
to the disk drive.
Turning off the AC power
a) To turn off the power, turn off the host system or the FC-AL switch, and then perform the
procedure shown in "(2) Notes on turning off the AC power".
b) Turn OFF the two power switches on the rear of the disk array unit. If an additional disk
enclosure is connected, turn OFF the two power switches on the rear of the disk array unit,
and then turn OFF the two power switches on the rear of the additional FC or SATA disk
enclosure. Alternatively, you can also turn OFF all the power switches on the disk array unit
and the additional disk enclosure at the same time.
The disk array unit has a redundant power configuration to prevent the entire unit from
shutting down due to a single failure. Therefore, when turning off the disk array unit, turn off
all the power switches (of the disk array unit and additional disk enclosures) at the rear of the
unit.
Be aware that you can lose data if you turn off the additional disk enclosures before the disk
array unit.
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