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v Create and maintain a cabling diagram of the current SAN configuration. Keep
v Create and maintain a list of other components that are being used within the
v Ensure that all ESMs are properly seated.
v Ensure that all EV-DDMs are properly seated.
v Ensure that all SFP modules are properly seated.
v Confirm fibre channel cable loop size. (IBM specifications call for at least 3-inch
v Ensure proper fibre channel cable management.
v Ensure proper air flow and temperature for all components in your EXP420
Note: You can find details on many of these inspection and maintenance
In addition to these inspection and maintenance responsibilities, IBM also strongly
recommends DS4000 training for staff that supports DS4000 storage configurations.
Although training is not a part of the Health Check process, 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 DS4200
Express, 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 97.
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
v Some storage expansion enclosures are being powered on while others remain
1. Are the main circuit breakers turned on?
this diagram updated as you make configuration changes, and keep the cabling
diagram available for review.
cabling diagram (such as the host system, fibre channel switches, and other SAN
attachments).
cable loops, but it is recommended that you use 6-inch cable loops or longer.)
storage configuration.
responsibilities in the appropriate sections of this document.
the cabinet are off.
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 EV-DDMs - Repeatedly turning the power off and on
without waiting for the EV-DDMs to spin down can damage the drives. 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 DS4200 Express 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.
Chapter 4. Operating the storage subsystem
81
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