Hot-adding a DS14mk2 AT to an existing loop

About this section

This section provides information about how to hot-add a DS14mk2 AT to an existing loop. It also tabulates the error messages that appear on your storage appliance console if the attempt at hot-adding was unsuccessful.

Requirements for hot-adding

The following requirements must be met when hot-adding a DS14mk2 AT to an existing loop:

The new disk shelf and the loop of disk shelves must only have AT-FCX modules.
The hot-added disk shelf must have new drives that will be used as spares only.
You must follow the procedure Hot-adding a disk shelf to an existing loop exactly.

Hot-adding a disk shelf to an existing loop

To hot-add a disk shelf to an existing loop, complete the following steps.

Caution
To hot-add disk shelves to a cluster, see the cluster guide for your storage appliance.

Step	Action
1	Ground yourself to the system chassis using the grounding leash.
2	Install the disk shelf. Follow Step 3 through Step 9 of Installing a disk shelf.
3	Connect the two disk shelf power cords to each disk shelf that you are adding. Caution Do not turn on the power to the disk shelf yet.
4	Verify that the disk shelf ID is not being used in the loop by entering the following command at the console: fcstat device_map adaptername Caution An invalid disk shelf ID causes the storage appliance to panic.
5	Turn on the power to the disk shelf and you must wait 30 seconds for the shelf electronics to finish initializing.
6	Perform Step 7 through Step 10 exactly. Note If you connect the cable to the existing loop before you connect it to the new shelf, you end up with an open loop panic.
7	Connect one end of the cable to the AT-FCX A Input on the new disk shelf.
8	Connect the other end of the provided cable to the AT-FCX A Output on the last disk shelf in the existing loop.
9	Connect one end of the cable to the AT-FCX B Input on the new disk shelf.
10	Connectthe other end of the provided cable to the AT-FCX B Output on the last disk shelf in the existing loop.
11	Verify that all the cables are securely fastened. Caution Poorly secured cables cause the storage appliance to panic over an open loop. Result In 60 seconds, the storage appliance recognizes the hot-added disk shelf.

Error messages

The following error messages appear on your storage appliance console if your attempt at hot-adding the DS14mk2 AT is unsuccessful.

Error message	Explanation
Open loop panic	One of two reasons cause this error message to appear: The shelf-to-shelf cable between the now second-to-last disk shelf and the newly added disk shelf is defective or is not securely fastened. The speed of the newly added DS14mk2 AT disk shelf is incorrectly set.
Soft address panic	One of two reasons cause this error message to appear: There is an invalid disk shelf ID. The power was turned on before the disk shelf ID was changed and the disk shelf was not power-cycled after the disk shelf ID was changed.

Error message

Explanation

Open loop panic

One of two reasons cause this error message to appear:

The shelf-to-shelf cable between the now second-to-last disk shelf and the newly added disk shelf is defective or is not securely fastened.
The speed of the newly added DS14mk2 AT disk shelf is incorrectly set.

Soft address 
panic