the startup sequence that is described in this section. If you are turning on the
storage subsystem after an emergency shutdown or power outage, see “Restoring
power after an unexpected shutdown” on page 98.
The following procedure addresses two situations:
v The entire storage subsystem has been shut down (the main circuit breakers for
the rack are off).
v Some storage enclosures are being powered-on while others remain online (the
main circuit breakers for the rack are on). You might encounter this if you are
adding a storage enclosure to increase storage capacity.
Attention:
1. Repeatedly turning the power off and on without waiting for the drives to
spin down can damage the drives. Always wait at least 70 seconds after you
turn off the power before you turn it on again.
2. If you are connecting a power cord to a storage subsystem or storage
enclosure, turn off both of its power switches first. If the main circuit breaker
is off, ensure that both power switches are off on each storage enclosure in
the rack before you turn on the main circuit breakers.
1. Are the main circuit breakers turned on?
v Yes: Turn off both power switches on each enclosure that you intend to
connect to the power.
v No: Turn off both power switches on all enclosures in the storage subsystem.
2. Ensure that all power cords are connected.
Note: If the power cords are not connected, turn off both power switches on all
modules in the configuration before you connect power cords or turn on the
main circuit breakers.
3. If the main circuit breakers are turned off, turn them on.
Attention: You must turn on power to each attached storage enclosure before
you turn on power to the storage subsystem so that the controllers recognize all
drives in the configuration during the startup process.
4. If you have enclosures with dc power supplies, turn on the disconnect device
that you installed on the -48V line in “Cabling the DS3500 and EXP3500 dc
power supplies” on page 78.
5. Turn on both power switches on the rear of each storage enclosure that is
attached to the storage subsystem. While each storage enclosure powers up, the
green and amber LEDs on the front and rear of the storage enclosure turn on
and off intermittently. Depending on the configuration, it can take several
minutes for each storage enclosure to power-on.
Check the LEDs on the front and rear of all the storage enclosures. Ensure that
no amber LEDs are lit on any of the storage enclosures.
6. Turn on both power switches on the rear of the storage subsystem. Figure 75 on
page 84 shows the locations of the ac power switches. Figure 76 on page 84
shows the locations of the dc power switches.
Chapter 4. Operating the storage subsystem and storage enclosure 83
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