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Step 6: Cabling, turning on, and verifying storage enclosure operation
This procedure is for both adding and migrating storage enclosures. The following
notes describe information that you must consider when you connect the storage
enclosure:
v Connect the new storage enclosure first to any unused drive ports, especially if
v If there are not any unused drive ports, connect the new storage enclosure to the
v Add only one storage enclosure at a time to a drive loop, if you intend to attach
v See the documentation that comes with your storage subsystem to attach the
Attention:
the new storage enclosures. Either remove the drives completely or pull out the
drives about one-half inch from the storage enclosure before powering on the
storage subsystem. Otherwise, the controllers might not boot up.
Cabling the new enclosures
To complete the addition of storage enclosures, cable the storage enclosures to the
end of the storage enclosure drive loop to which you are migrating them. Add
only one enclosure at a time to a drive loop, if you intend to attach multiple
storage enclosures.
Connect the storage enclosure to any unused drive ports when you add storage
enclosures to an existing configuration, especially if you are adding enclosures of a
different type to the configuration. See the documentation that comes with your
storage subsystem to attach the storage enclosures to the storage subsystem.
You might find that connection to the end (at the bottom) directly attached to
controller B is best practice because if the existing configuration is not planned for
cabling-in storage enclosures at the top or the middle of the drive loop, cluttered
drive loop cabling might hinder troubleshooting or cause cabling errors. Only
typical expansion enclosure additions are shown in the procedure and graphics in
these sections. However, the instructions can be adapted for all expansion
enclosure addition scenarios. For the appropriate cabling scenario and to adapt the
instructions to add an expansion enclosure to an existing drive loop in a storage
subsystem configuration, see the storage subsystem Installation, User's and
Maintenance Guide.
Connecting storage enclosures at the end (bottom) of a drive
loop
Connecting a new storage enclosure to the end of the drive loop is the best
practice to avoid cluttered drive loop cabling that might hinder troubleshooting or
cause cabling errors.
To connect a storage enclosure at the end (bottom) of a drive loop, complete the
following steps:
1. Extend one of the drive loops (that is, drive loop/channel that is connected to
you are adding storage enclosures of a different type to the configuration.
existing drive loop that can accommodate additional storage enclosures.
multiple storage enclosures.
storage enclosures to the storage subsystem.
Do not power on a storage subsystem with new drives installed in
controller A) in a storage subsystem redundant drive loop/channel pair by
Chapter 3. Adding or migrating storage enclosures
31
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