IBM N Series, Hardware Manual

Page: 158 / 368

138
IBM System Storage N series Hardware Guide
About this task
Disk shelves do not need to be grounded; grounding is done through the power cords.
Complete the following steps:
1. Properly ground yourself.
2. Install the two-post telco tray kit or the four-post rail kit for your disk shelf model by using
the installation flyer that came with the kit.
Do not ear-mount the disk shelf into a telco-type rack; the disk shelf collapses from the
rack under its own weight.
3. Install and secure the disk shelf onto the support brackets and rack.
To make the disk shelf lighter and easier to maneuver, remove the power supplies and I/O
modules (IOMs). Avoid removing the disk drives or carriers if possible because excessive
handling can lead to internal damage.
4. Reinstall any power supplies and IOMs that you removed to install your disk shelf into the
rack.
5. Repeat Steps 3 and 4 for each disk shelf you are installing if you are adding multiple disk
shelves.
6. Complete the following steps to connect the power supplies for each disk shelf:
a. Connect the power cords first to the disk shelves, securing them in place with the
power cord retainer, and then to different power sources for resiliency.
b. Turn on the power supplies for each disk shelf and wait for the disk drives to spin up.
When the disk shelf has the maximum number of supported power supplies, all disk
drives or carriers spin up at the same time. However, if one or two power supplies
faulted in a disk shelf with four power supplies, or if one power supply faulted in a disk
shelf with two power supplies, disk drives spin up in sets of six at 12-second intervals.
7. Change the shelf ID for each disk shelf that you hot-added by completing the following
steps. You can verify IDs already in use by entering the sasadmin shelf command at the
system console of either node:
a. Change the shelf ID to a valid ID that is unique from the other SAS disk shelves in the
storage system.
b. Power-cycle the disk shelf to make the shelf ID take effect.
Attention: If you are installing multiple disk shelves, you should install them from the
bottom to the top of the rack for the best stability.
Attention: For two-post mid-mount installations, you must use the mid-mount brackets
in addition to the two-post telco tray kit.
Attention: A fully populated EXN3000 disk shelf can weigh approximately 110 lbs
(49.9 kg). A fully populated EXN3500 disk shelf can weigh approximately 49 lbs (22 kg).
Note: If you have a disk shelf with four power supplies, connect power supplies in
slots 1 and 3 to one power source and power supplies in slots 2 and 4 to a different
power source.