Storage System Power On; Base Unit - Hitachi AMS 2100 Hardware Manual

When the base unit must be restarted, change the pair status of
TrueCopy remote replication/TrueCopy Extended Distance to PSUS, and
then restart the unit.
NOTE: When the Power Saving storage feature is used, if you restart the
base unit while the spin-down is in progress, the spin-down may fail
because it recognizes the host immediately after the unit starts.
After the spin-down has completed, check the RAID Groups and make sure
that none of them are set to the "Normal (command monitoring)" power
saving status. Then restart the unit. If the spin-down fails, start the spin-
down again.

Storage system power on

Base unit

The power ON/OFF buttons on the front bezel actuate the Main Switch on
the front of the base unit (behind the front bezel). The Main Switch is a
rocker switch on the switch panel, which is located in the lower right corner
on the front panel of the base unit. See
in Figure 6-2
The Main Switch controls power to all components in the base unit except
the power supplies. The power supplies do not have a power switch and turn
on as soon as the power cables are connected to them. They can deliver
power to the rest of the unit after successful completion of their POSTs.
When only one power supply is plugged in, the multispeed fans on that
power supply run at high speed to ensure that the base unit has sufficient
cooling. As soon as the second power supply is plugged in, the fans on both
power supplies run at low speed to cool the power supplies. When the base
unit is running and both power supplies in the base unit are plugged in, the
multispeed fans run at whatever speed is needed to provide adequate
cooling of all components in the base unit.
NOTE: When the Main switch is toggled to the Standby position, power is
still applied to the power supplies. To completely remove the power from
the unit, remove both power cables from the unit or disconnect them from
the power source.
on the next page.
Figure 6-1: Base Unit Switch Panel Location
Power On/Off procedures
Hitachi AMS 2100/2300 Storage System Hardware Guide
Figure 6-1 and the expanded view
6–3