v
To maintain power redundancy, plug the DS5100 and DS5300 right and left RAID
controller 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 DS5100 and DS5300 storage
expansion enclosures attached to the DS5100 and DS5300 should be plugged
into the same two independent external power circuits as the DS5100 and
DS5300. This ensures that the DS5100 and DS5300 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 DS5100 and DS5300 devices in the configuration
to power on simultaneously during an unattended restoration of power. See
Figure 89 on page 125 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.
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), complete the following
tasks:
1. Save the storage subsystem profile
2. Save the storage subsystem configuration
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 on how to complete these tasks, check the DS Storage
Manager online help or the Storage Manager guide for your operating system.
v
During any maintenance or attended power-up procedure, carefully follow the
power-up sequence listed in “Turning on the storage subsystem” on page 131.
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.
v
The storage subsystem supports simultaneous power-up to the system
components; however, you should always follow the power-up sequence listed in
“Turning on the storage subsystem” on page 131 during any attended power-up
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 IBM support if any of the
following conditions occur:
– The storage subsystem logical drives and arrays are not displayed in the DS
Storage Manager graphical user interface (GUI).
– The storage subsystem logical drives and arrays do not come online.
– The storage subsystem logical drives and arrays seem to be degraded.
Storage subsystem components
The DS5100 and DS5300 storage subsystem directs and manages the I/O activity
between a host and the drives in a RAID array. Figure 1 on page 7 shows the
DS5100 and DS5300 with front bezel in place.
6
IBM System Storage DS5100 and DS5300 Storage Subsystem: Installation, User’s, and Maintenance Guide
