Hot-swapping an LRC, ESH, or ESH2

Assumptions about this procedure

The assumptions about this procedure are that the LRC, ESH, and ESH2 modules on the disk shelf are multipath connections to the appliance and that you are hot-swapping an LRC with another LRC, an ESH with another ESH, an ESH2 with another ESH2, or an ESH with an ESH2.

Note
A hot-swap of an ESH with an ESH2 requires that you upgrade to Data ONTAP 6.4.4 or later and replace both ESH modules in the disk shelf.

Caution
If you attempt to hot-swap the LRC, ESH, or ESH2 module on a disk shelf that does not have multipath connections, you lose all access to the drives on this disk shelf as well as others in the same disk pool.

Hot-swapping a module

You can hot-swap an LRC or ESH module in a cluster. To hot-swap a single LRC or ESH module that belongs to the partner node, complete the following steps.

Step	Action
1	From the console of the appliance, enter the following command to disable the loop in which the failed module is a connection: cf takeover Note `cf takeover` is not needed in a MetroCluster configuration.
2	Verify that your appliance meets the minimum software requirements to support the disk shelf modules that you are hot-swapping. See the DiskShelf14 and DiskShelf14mk2 FC Hardware Guide for more information.
3	Put on the antistatic wrist strap and grounding leash.
4	If you are hot-swapping...	Then...
	An LRC or ESH with like modules	Note the position of the terminate switch on the LRC, ESH, or ESH2 you are removing and set the terminate switch on the replacement LRC, ESH, or ESH2 to the same setting before inserting it into the disk shelf.
	An ESH with an ESH2 for a disk shelf that is either the first shelf in the loop or a shelf in the middle of the loop where all other disk shelves have ESHs	Place the terminate switch on all but the last disk shelf in the loop to the Off position on ESH A (up). Place the terminate switch on the last disk shelf in the loop to the On position on ESH A (down) and ESH B (up). Note ESH2 is self-terminating and does not have a terminate switch.
	An ESH with an ESH2 for a disk shelf that is the last shelf in the loop, where all other disk shelves have ESHs	On all but the last disk shelf in the loop, place the terminate switch to the Off position on ESH A (up).
	An ESH2 with an ESH2	Go to Step 5.
5	If you are hot-swapping...	Then...
	An LRC, ESH, or ESH2 with like modules	Disconnect the module that you are removing from the Fibre Channel cabling.
	An ESH with an ESH2	Disconnect the ESH from the Fibre Channel cabling and remove the cabling.
6	Using the thumb and index finger of both hands, press the levers on the CAM mechanism on the module to release it and pull it out of the disk shelf.
7	Slide the replacement module into the slot at the rear of the disk shelf and push the levers of the CAM mechanism into place. Caution Do not use excessive force when sliding the module into the disk shelf; you might damage the connector.
8	If you are hot-swapping...	Then...
	An LRC, ESH, or ESH2 with like modules	Reconnect the Fibre Channel cabling.
	An ESH with an ESH2 if it is the first shelf in the loop where all other disk shelves have ESHs	Reconnect the Fibre Channel cabling by using LC-to-LC cables when connecting to optical FC-AL adapters. Use HSSDC2-to-SFP cables for connections between the disk shelf with ESH2 and the disk shelf with ESH.
	An LRC, ESH, or ESH2 if it is a shelf in the middle of the loop, or the last shelf in the loop, where all other disk shelves have ESHs	Use HSSDC2-to-SFP cables for connections between a disk shelf with ESH and a disk shelf with ESH2.
9	From the console of the appliance, enter the following command to enable the loop in which the replacement module is a connection: cf giveback
10	Repeat Step 3 through Step 9 for Loop B.
11	Test the replacement module, as described in Testing the modules."

Testing the modules

To test your LRC, ESH, or ESH2 modules, complete the following steps on both nodes.

Step	Action
1	Verify that all disk shelves with ESH or ESH2 modules are functioning properly by entering the following command: environ shelf Results The system reports the modules as good.
2	Verify that you can create and retrieve files on both nodes for each licensed protocol.
3	Verify that there are no missing disks by entering the following command: vol status -r Result Local disks displayed on the local node should be displayed as partner disks on the partner node, and vice-versa.

Step

Action

Verify that all disk shelves with ESH or ESH2 modules are functioning properly by entering the following command:

environ shelf

Results

The system reports the modules as good.

Verify that you can create and retrieve files on both nodes for each licensed protocol.

Verify that there are no missing disks by entering the following command:

vol status -r

Result

Local disks displayed on the local node should be displayed as partner disks on the partner node, and vice-versa.