IBM System Storage Subsystem DS5020 - Manual (Page 125)

v Make sure that all ESMs are properly seated.
v Make sure that all drives are properly seated.
v Make sure that all SFP modules are properly seated.
v Confirm Fibre Channel cable loop size. (Although IBM specifications require at
least 3-inch cable loops, use 6-inch cable loops or longer.)
v Make sure that you have proper Fibre Channel cable management.
v Make sure there is proper air flow and temperature for all components in your
storage configuration.
Note: You can find details on many of these inspection and maintenance
responsibilities in the applicable sections of this document.
In addition to these inspection and maintenance responsibilities, DS5000 and
DS4000 training is available for staff who support DS5000 and DS4000 storage
configurations. Although training is not a part of the Health Check process, DS5000
and DS4000 training reduces the potential for configuration problems and
contributes to the overall health of the system.
Powering on the storage subsystem
This section contains instructions for turning the storage subsystem on under
normal and emergency situations. When you turn on and turn off the DS5020, be
sure to use the startup sequence 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 112.
Turning on the storage subsystem
The following procedure covers two situations:
v The entire storage subsystem has been shut down. (The main circuit breakers for
the cabinet are off.)
v Some storage expansion enclosures are being powered on while others remain
online. (The main circuit breakers for the cabinet are on.) You might encounter
this if you are adding an additional storage expansion enclosure to increase
storage capacity.
Attention:
1. Potential damage to E-DDMs - Repeatedly turning the power off and on
without waiting for the E-DDMs to spin down can damage them. Always wait
at least 70 seconds from when you turn off the power until you turn it on
again.
2. If you are connecting a power cord to a DS5020 storage subsystem or
storage expansion enclosure, turn off both of its power switches first. If the
main circuit breaker is off, be sure both power switches are off on each
storage expansion enclosure in the cabinet before turning 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. See “Cabling the ac power
supply” on page 91 for details, depending on the DS5020 configuration you
purchased.
Chapter 4. Operating the storage subsystem 95