IBM DS3950, Инструкция по установке, использованию и обслуживанию, Страница: 34 / 252

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To maintain power redundancy, plug the DS3950 right and left power supply
and fan units into two independent external power circuits through ac power
distribution units inside a rack cabinet or directly into external receptacles.
Similarly, make sure that the right and left power supplies of the storage
expansion enclosures attached to the DS3950 are plugged into the same two
independent external power circuits as the DS3950. This ensures that the DS3950
and all its attached storage expansion enclosures will have power in the event
that only one power circuit is available. In addition, having all the right or all
the left power cables plug into the same power circuit enables the devices in the
configuration to power on simultaneously during an unattended restoration of
power.
Note:
Do not overload the circuits that power your storage subsystem and
storage expansion enclosures. Use additional pairs of ac power
distribution units (PDUs) if necessary. See “Electrical requirements” on
page 23 for information about storage subsystem power requirements.
Contact your IBM service representative for additional information if
needed.
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Before any planned system shutdown or after any system additions, removals,
or modifications (including firmware updates, logical drive creations, storage
partitioning definitions, hardware changes, and so on), complete the following
tasks:
1. Save the storage subsystem profile
2.
Save the storage subsystem configuration
3. Save the Collect All Support Data (CASD)
Make sure that you save the files in a location other than in the logical drives
that were created for the storage subsystem.
For more information about how to complete these tasks, check the DS Storage
Manager online help or the Storage Manager guide for your operating system.
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During any maintenance or attended power-up procedure, carefully follow the
power-up sequence listed in “Powering on the storage subsystem” on page 95.
Check that each component of the subsystem is powered-on in the proper order
during this entire power-up procedure so the controller will be able to optimally
access all of your storage subsystems.
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The storage subsystem supports simultaneous power-up to the system
components, but always follow the power-up sequence listed in “Powering on
the storage subsystem” on page 95 during any attended power-up procedure.
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A storage system in an optimal state recovers automatically from an unexpected
shutdown and unattended simultaneous restoration of power to system
components. After power is restored, call IBM support if any of the following
conditions occur:
– The storage subsystem logical drives and subsystems are not displayed in the
DS Storage Manager graphical user interface (GUI).
– The storage subsystem logical drives and subsystems do not come online.
– The storage subsystem logical drives and subsystems seem to be degraded.
Storage subsystem components
The storage subsystem has the following removable components. These
components, called customer replaceable units (CRUs), are accessible from the front
or back of the storage subsystem.
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Up to sixteen 4 Gbps Fibre Channel or SATA Enhanced Disk Drive Modules
(E-DDMs)
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IBM System Storage DS3950 Storage Subsystem: Installation, User’s, and Maintenance Guide