Adding an expansion enclosure

Complete this task to add an expansion enclosure to an existing storage unit. You can add an expansion enclosure to an existing storage unit while the server enclosure is powered on (concurrently) or powered off (nonconcurrently).

1. Complete the required preparation steps before you install the expansion enclosure. Your preparation is dependent on your installation area and current storage configuration. The required preparation steps might include, but are not limited to, verifying your ship group, gathering the necessary tools and equipment, familiarizing yourself with the proper ESD procedures, and positioning your rack.
2. Place the expansion enclosure in the rack.
   1. (Optional) Remove the hardware resources. If you remove all hardware resources before you lift the enclosure, you should be able to lift the enclosure into the rack. If you choose not to remove all hardware resources first, you must have at least three people that are available to lift the enclosure into the rack.
   2. Install the support rails.
   3. Install the expansion enclosure in the rack.
   4. (Optional) Replace the hardware resources. You must complete this step if you removed the hardware resources in step 2.a.
3. Perform one of the following two sets of steps, depending on your type of installation, concurrent or nonconcurrent:
   • Perform the following steps if you are concurrently installing expansion enclosures with the server enclosure powered on:
     1. Plan your interenclosure cabling to place the additional expansion enclosures on the appropriate loops. Use the interenclosure cables to create connections between all of the new expansion enclosures on each loop (loop 0 or loop 1). Do not connect the new expansion enclosures to the interenclosure loops (the server enclosure or any currently connected expansion enclosures) at this time.
        Important: You must correctly connect the interenclosure cables. Failure to do so can result in a loss of communication with the server enclosure.
     2. Connect all of the power cables for the new expansion enclosures.
     3. Power on all new expansion enclosures by pushing the white power button that is located on the rear operator panel of each expansion enclosure. When you power on the expansion enclosures, start with the last expansion enclosure on each loop and consecutively power on the next expansion enclosure up on the loop.

        The expansion enclosures are powered on after the fans begin spinning, the DC LED indicators on the power supplies turn a solid green, and the power-on lights on the rear operator panels turn a solid green.

     4. After all of the new expansion enclosures are powered on, complete one of the following two steps.
        • If you already have connected one or more expansion enclosures to your server enclosure, use the interenclosure cables to create the final connection between the last expansion enclosure on each loop and the first of the new expansion enclosures for that loop.
        • If you do not have any expansion enclosures that are connected to your server enclosure, use the interenclosure cables to create the final connection between the server enclosure and the first of the new expansion enclosures for each loop.
        Important: You must correctly connect the interenclosure cables. Failure to do so can result in a loss of communication with the server enclosure.
   • Perform the following steps if you are nonconcurrently installing expansion enclosures with the server enclosure powered off:
     1. Plan your interenclosure cabling to place the additional expansion enclosures on the appropriate loops. Use the interenclosure cables to connect the new expansion enclosure to the proper loop (loop 0 or loop 1).
        Important: You must correctly connect the interenclosure cables. Failure to do so can result in a loss of communication with the server enclosure.
     2. Connect all power cables for the expansion enclosures. All enclosures power on with the server enclosure once you push the power button on the rear operator panel of the server enclosure.

   Initialization begins after you use the interenclosure cables to connect the new enclosures to the existing interenclosure loops. The amount of time for initialization is dependent on the I/O load and the number of expansion enclosures that you are adding. This initialization time can take up to one-half hour per expansion enclosure. You cannot use the additional storage until initialization is complete.

4. If you want to verify that initialization is complete, use the DS CLI lsarraysite command to view the available array sites. This command requires that you have installed the DS CLI on your Management Console. The new array sites are listed with an "unassigned" state. There should be one new array site for every four DDMs that were added.
5. Before you begin configuring the additional storage, use the DS Storage Manager or the DS CLI to check the problem logs, and check the light path indicators on all new expansion enclosures to ensure that no new problems were generated when you added the expansion enclosures.