Power-Supply Switches And Connectors For - IBM DS3500 Installation, User's, And Maintenance Manual

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, make sure 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. Make sure 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 3-47.
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. Make sure 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 4-1 shows the locations of
the ac power switches. Figure 4-2 shows the locations of the dc power switches.
Power
connector
Figure 4-1. Power-supply switches and connectors for DS3500 ac models
Power
connector
Figure 4-2. Power-supply switches and connectors for DS3500 dc models
Depending on the number of storage enclosures in the configuration, the storage subsystem might
take up to 10 minutes to fully power-on. While each storage enclosure powers-on, the green and
amber LEDs on the front and rear of the storage enclosure turn on and off intermittently. The cache
battery backup self-test might take up to an additional 15 minutes to be completed. During this time,
the LEDs on the front and rear of the storage subsystem might flash intermittently.
Power Power
switch connector
Power Power
switch switch
Chapter 4. Operating the storage subsystem and storage enclosure
Power
switch
Power
connector
4-3