Hot-adding a DS14 to an existing loop

About this section

This section provides information about how to hot-add a DS14 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

To hot-add a DS14 to an existing loop, the following requirements must be met.

You are hot-adding a...	Your existing loop must...
DS14	Have a DS14 disk shelf as the last shelf

Hot-adding a DS14 to an existing loop

To hot-add a DS14 to an existing loop on a storage appliance, complete the following steps.

Step	Action
1	Put on the antistatic wrist strap and grounding leash.
2	Install the disk shelf. Follow Step 2 through Step 6 of Installing a DS14.
3	Ground the disk shelf using the provided grounding cable. Follow Step 4 and Step 5 of Grounding connected disk shelves.
4	Connect the disk shelf to a power source by following Step 2 of Connecting the disk shelf to power. Caution Do not turn on the power to the DS14 yet.
5	Give the disk shelf a unique disk shelf ID. See Step 5 of Installing a DS14 for specific instructions. Note Only use disk shelf ID 7 if it is the last ID available.
6	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.
7	Turn on the power to the disk shelf.
8	Connect one end of the provided cable to the LRC A Output on the last DS14 disk shelf in the existing loop.
9	Connect the other end of the cable to the LRC A Input on the new DS14 disk shelf.
10	Connect one end of the provided cable to the LRC B Output on the last DS14 disk shelf in the existing loop.
11	Connect the other end of the cable to the LRC B Input on the new DS14 disk shelf.
12	Verify that all the cables are securely fastened. Caution Poorly secured cables cause the storage appliance to panic over an open loop.
13	Turn the terminate switch of the newly added DS14 disk shelf to the On position for LRC A (down) and LRC B (up). Caution Failure to place the terminate switches in the On position cause the storage appliance to panic over an open loop.
14	Turn the terminate switch of the now second-to-last DS14 to the Off position for LRC A (up) and LRC B (down). 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 DS14 is unsuccessful.

Error message	Explanation
Open loop panic	The terminate switch on LRC A and LRCB on the new DS14 disk shelf are not in the On position.
Open loop panic	The shelf-to-shelf cable between the now second-to-last DS14 disk shelf and the newly added DS14 disk shelf is defective or is not securely fastened.
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

The terminate switch on LRC A and LRCB on the new DS14 disk shelf are not in the On position.

Open loop panic

The shelf-to-shelf cable between the now second-to-last DS14 disk shelf and the newly added DS14 disk shelf is defective or is not securely fastened.

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.