Note: If the power cords are not connected, turn off both power switches on all
modules in the configuration before connecting power cords or turning on
the main circuit breakers.
Attention: If you are restarting the system after a normal shutdown, wait at
least 60 seconds before you turn on the power.
3. Turn on the main circuit breakers in the cabinet.
Attention: You must turn on power to each attached storage expansion
enclosure before turning on power to the DS4800 Storage Subsystem to ensure
that the controllers complete the startup process. If the DS4800 controllers do
not find any drives present during the initial power on sequence, the DS4800
will not complete the startup process. This will prevent controllers A and B from
communicating with each other, and any factory-installed premium features will
not be activated correctly.
4. Turn on both power switches on each storage expansion enclosure attached to
the storage subsystem. While each storage expansion enclosure powers up, the
green and amber LEDs on the front and back of the storage expansion
enclosure turn on and off intermittently. Depending on your configuration, it can
take several minutes for each storage expansion enclosure to power up.
Check the LEDs on the front and back of all the storage expansion enclosures.
Verify that no Needs Attention or Enclosure ID LEDs light on any of the storage
expansion enclosures. To verify the fibre channel connections between the drive
expansion enclosures, make sure that no Port Bypass LEDs for connections to
other storage expansion enclosures are lit. Only the Port Bypass LED of the
ESM port that connects directly to the DS4800 Storage Subsystem drive port
should be lit.
Note: The drive activity LEDs will flash slowly (once every 2 seconds) until the
drive is started by the DS4800 controller.
5. Turn on the AC power switch on the back of each controller in the storage
subsystem. Figure 73 shows the location of the AC power switches on the
controllers.
Depending on the number of storage expansion enclosures in the configuration,
the DS4800 Storage Subsystem might take several minutes to power up. The
AC power
switch
AC power
connector
AC power
switch
AC power
connector
Controller A
Controller B
ds48040
Figure 73. AC power switches on the controllers
106 IBM System Storage DS4800 Storage Subsystem: Installation, User’s, and Maintenance Guide
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