Welcome to the Unity Disk Array Enclosure, or DAE Replacement Demonstration. Please refer to the applicable field replacement procedure on support.emc.com for the complete details. To begin, we’re going to log into Unisphere using the admin account. As we can see on the Unity dashboard, in the System Health window, there are no hardware issues reported. Let’s take a look at the DAE by navigating to the Enclosures view.
Click on the System View link and then on the Enclosures tab. Let’s select the DAE. Shown here is the rear view of the DAE. Let’s check the front view. As we can see the DAE is a 15-drive DAE. Even though there are no errors or alerts shown we’re going to replace it. Note that a 25- drive DAE replacement procedure would be similar to the 15-drive DAE replacement. We’ll begin by navigating to the System Service page and then select Service Tasks.
We need to shut down the storage system to replace the DAE. Note that when all SPs are down, all I/O services stop and hosts lose access to the system. Before performing this procedure, it is recommended that you disconnect all network shares, launch and VMware datastores from each host to prevent data loss. Select the Shutdown Storage System task and click ‘Execute.’ Enter the service password when prompted.
Note that the shutdown process will take between 10 to 20 minutes to complete. Click ‘OK’ to acknowledge the warning. Now let’s move to the rear of the cabinet and check the progress on the shutdown. When the DPE has successfully powered down, the SP power LEDs are on solid and the SP status fault LED is blinking amber. After confirming the DPE has powered off, release the cable retention bail and unplug the power cord from the power supply.
Now that the system is completely powered down, we can begin replacing the DAE. Release the cable retention bails and remove the power cables from the DAE power supplies. Remove each cable connected to the LCCs by gently pulling the connector latches to release the cable from the connector.
Note where the cables connect to the LCC because you will need to reconnect them later. Now let’s move to the front of the DAE. Remove the four screws that secure the front of the enclosure to the front of the cabinet and save the screws.
With the help from another person, slide the DAE out of the cabinet and place it on a static-free work surface. Lift the replacement DAE and slide it onto the rails. Secure the front of the enclosure to the front of the cabinet using the four screws. Begin transferring the drives from the faulted DAE to the replacement DAE.
Make sure to transfer the drives or any drive filler modules to the same slots in the replacement DAE that they occupied in the faulted enclosure. Installing this out of the original order may result in data unavailability and possible data loss. Now let’s move to the rear of the cabinet and transfer the remaining parts.
We’ll start with the power supply cooling module A on the bottom. Turn the captive screw counter-clockwise to release it. You may need a screwdriver to loosen it. Remove the module from the DAE. Gently insert it into the new DAE, being sure the module is completely seated, and then secure it with the captive screw. Turn the captive screws counter-clockwise to release LCC A next. We’ll loosen LCCC B at the same time.
Gently insert the LCC into the new enclosure, being sure the LCC is completely seated, and then secure it with the captive screws. Repeat for LCC B. Finally transfer power supply cooling module B into the new enclosure. Now, we can re-cable the DAE. Begin by installing the power cables, being sure to secure them with the cable retention bails. Next, reconnect the LCC cables.
Now that the DAE is powered up, let’s reconnect power to SP A and SP B. Note that it will take a few minutes to power up the storage processors. We’ll skip ahead to the end of the reboot. Here we can see that the storage processors have completed their power up into normal mode.
Let’s log into Unisphere now and check the system status. Let’s log in to Unisphere using the admin account. Navigate to the System View and then select the Enclosures tab. Here, we can see the DAE and all its subcomponents are operating normally. This completes the Unity DAE Replacement Demonstration.
