Follow these
guidelines to create a plan that identifies an appropriate location
in the rack for the enclosure or enclosures that you are installing
now or in the future. An enclosure requires two standard rack units
of space in a rack.
If you are installing a control enclosure only, follow these guidelines:
Position the enclosure
in the rack so that you can easily view it and access it for servicing.
This action helps the rack to remain stable and provides a way for
two or more people to install and remove the enclosure.
If you are installing a control enclosure plus one or more expansion enclosures, follow these guidelines:
If you have one
or more expansion enclosures, position the control enclosure in the
middle of the expansion enclosures. Balance the expansion enclosures
above and below the control enclosure.
For example, position the control enclosure
in the middle of the enclosures for ease of cabling.
- You can have no more than five expansion enclosures attached to
SAS port 1 of the control enclosure.
- You can have no more than four expansion enclosures attached to
SAS port 2 of the control enclosure.
- Position the enclosures together; avoid adding other equipment
between enclosures.
- When you add the first expansion enclosure to a control enclosure,
it is preferable to add the enclosure directly below the control enclosure.
- When you add a second expansion enclosure, it is preferable to
add the enclosure directly above the control enclosure. For each additional
expansion enclosure that you add, alternately add it below or above
the control enclosure.
- Position the enclosures in the rack so that you can easily view
them and access them for servicing. This action helps the rack to
remain stable and provides a way for two or more people to install
and remove the enclosures.
If you are installing an expansion enclosure to an existing system, follow these guidelines:
When you add the
first expansion enclosure to a control enclosure, it is preferable
to add the enclosure directly below the control enclosure. When you
add a second expansion enclosure, it is preferable to add the enclosure
directly above the control enclosure. For each expansion enclosure
that you add, alternately add it below or above the control enclosure.
If you are adding an expansion enclosure to
an existing system, you do not need to power off the system. You
can add an expansion enclosure while the system is operational.
If you are installing more than one control enclosure, follow these guidelines:
If
you plan to add more than one set of a control enclosure and expansion
enclosures, put the second set of enclosures above the first set of
enclosures.
Review the guidelines for
"If you are installing a control enclosure
plus one or more expansion enclosures." You can also add the second
set of enclosures in a different rack.
Note: When you
perform the installation of the enclosures, load the rack from the
bottom to ensure rack stability. Empty the rack from the top down.
If you are adding another
control enclosure to an existing system, you do not need to power
off the system. You can add the control enclosure while the system
is operational.