Considerations for installing and cabling disk shelves with IOM12 modules for a new system installation

You should familiarize yourself with aspects and best practices about this procedure before installing and cabling the disk shelves.

General considerations

Disk shelves with IOM12 modules are shipped with shelf IDs preset to 00.
Note
If you have an HA pair with at least two stacks, the disk shelf containing the root aggregates for the second stack has the shelf ID preset to 10.
You must set shelf IDs so they are unique within the HA pair configuration. You can manually set shelf IDs or have shelf IDs automatically assigned for all disk shelves in the HA pair configuration using a command in maintenance mode. Instructions for both methods are provided.
Disk shelves containing the root aggregates can be identified by the labels on the disk shelf box and disk shelf chassis.
The labels show the stack number; for example, Loop or Stack #: 1 and Loop or Stack #: 2 . Disk shelves that do not contain the root aggregates only show the disk shelf serial number is on the labels.
If at system setup and configuration, you do not configure the system to use automatic disk ownership assignment, you need to manually assign disk ownership.
In-band Alternate Control Path (ACP) is automatically enabled.

The best practice is to have the current version of the Disk Qualification Package (DQP) installed.
Having the current version of the DQP installed allows your system to recognize and utilize newly qualified disk drives; therefore, avoiding system event messages about having non-current disk drive information. You also avoid the possible prevention of disk partitioning because disk drives are not recognized. The DQP also notifies you of non-current disk drive firmware.
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Visually inspect the SAS port to verify the proper orientation of the connector before plugging it in.
The SAS cable connectors are keyed. When oriented correctly into a SAS port, the connector clicks into place and if the disk shelf power is on at the time, the disk shelf SAS port LNK LED illuminates green. For disk shelves, you insert a SAS cable connector with the pull tab oriented down (on the underside of the connector).
For controllers, the orientation of SAS ports can vary depending on the platform model; therefore, the correct orientation of the SAS cable connector varies.
To prevent degraded performance, do not twist, fold, pinch, or step on the cables.
Cables have a minimum bend radius. Cable manufacturer specifications define the minimum bend radius; however, a general guideline for minimum bend radius is 10 times the cable diameter.
Using Velcro wraps instead of tie-wraps to bundle and secure system cables allows for easier cable adjustments.

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