Best Practices Guidelines - IBM DS4800 User, Installation And Maintenance Manual

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Best practices guidelines

To ensure optimal operation of your system, always follow these best practices
guidelines:
v Ensure that your system is in an optimal state before you shut it down. Never
v Back up the data on your storage drives periodically.
v To maintain power redundancy, plug the DS4800 right and left RAID controller
v Before any planned system shutdown or after any system additions, removals, or
v During any maintenance or attended power-up procedure, carefully follow the
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IBM System Storage DS4800 Storage Subsystem: Installation, User's, and Maintenance Guide
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turn the power off if any Needs Attention LED is lit; be sure to resolve any error
conditions before you shut down the system.
units into two independent external power circuits through ac distribution units
inside a rack cabinet or directly into external receptacles. Similarly, the right and
left power supplies of the DS4000 storage expansion enclosures attached to the
DS4800 should be plugged into the same two independent external power
circuits as the DS4800. This ensures that the DS4800 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 DS4000 devices in the configuration to
power on simultaneously during an unattended restoration of power. See
Figure 68 on page 91 for an example of redundant power connections.
Note: Do not overload the circuits that power your storage subsystem and
storage expansion enclosures. Use additional pairs of power distribution
units (PDUs) if necessary. Refer to the Installation, User's, and
Maintenance Guide for your storage expansion enclosures for information
on storage expansion enclosure power requirements. Contact your IBM
service representative for additional information if needed.
modifications (including firmware updates, logical drive creations, storage
partitioning definitions, hardware changes, and so on), save the storage
subsystem profile as explained in the DS4000 Storage Manager guide for your
operating system. Save the profile in a location other than in the logical drives
created for the DS4800.
power-up sequence listed in "Turning on the storage subsystem" on page 97.
Check that each component of the subsystem is powered-on in the proper order
during this entire power-up procedure to ensure the controller will be able to
optimally access all of your storage subsystems.