Best Practices Guidelines - IBM DS3500 Installation, User's, And Maintenance Manual

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Best practices guidelines

To ensure optimal operation of your system, always follow these best practices guidelines:
v Make sure that the storage subsystem is in an optimal state before you shut it down. Never turn off
the power if any amber LED is lit; be sure to resolve any error conditions before you shut down the
storage subsystem.
v Back up the data on your storage drives periodically.
v To maintain power redundancy, connect the DS3500 storage subsystem and EXP3500 storage enclosure
right and left power supplies to two independent external power circuits through ac power
distribution units (PDUs) inside a rack or directly into external receptacles. This ensures that all devices
in the configuration have power in the event that only one power circuit is available. In addition,
having all the right or all the left power cables connected to 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 enclosures. Use
additional pairs of ac PDUs. See Table 1-1 on page 1-4 for information about storage subsystem power
requirements. Contact your technical-support representative for additional information.
v 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), save the storage subsystem profile as explained in the DS Storage Manager 10 Installation
and Host Support Guide for your operating system. Save the profile in a location other than in the logical
drives that are created for the DS3500 storage subsystem and EXP3500 storage enclosure.
v During any maintenance or attended power-on procedure, carefully follow the power-on sequence that
is described in "Turning on the storage subsystem" on page 4-2. Make sure that each component of the
storage subsystem is powered-on in the correct order during this entire power-on procedure to make
sure that the controller will be able to optimally access all of the storage subsystems.
v The storage subsystem supports simultaneous power-on to the system components; however, you
should always follow the power-on sequence that is described in "Turning on the storage subsystem"
on page 4-2 during any attended power-on procedure.
v A storage subsystem in an optimal state should recover automatically from an unexpected shutdown
and unattended simultaneous restoration of power to system components. After power is restored, call
your IBM technical-support representative if any of the following conditions occur:
– The storage subsystem logical drives and subsystems are not displayed in the Storage Manager
graphical user interface.
– The storage subsystem logical drives and subsystems do not come online.
– The storage subsystem logical drives and subsystems seem to be degraded.
v When using dc models equipped with dc power supply and fan units, install the dc
disconnect/breaker device as described in "Cabling the DS3500 and EXP3500 dc power supplies" on
page 3-47.
1-7
Chapter 1. Introduction