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Replace a DIMM - AFF A400

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You must replace a DIMM in the controller when your storage system encounters errors such as, excessive CECC (Correctable Error Correction Codes) errors that are based on Health Monitor alerts or uncorrectable ECC errors, typically caused by a single DIMM failure preventing the storage system from booting ONTAP.

All other components in the system must be functioning properly; if not, you must contact technical support.

You must replace the failed component with a replacement FRU component you received from your provider.

Step 1: Shut down the impaired controller

Shut down or take over the impaired controller using the appropriate procedure for your configuration.

Option 1: Most configurations

To shut down the impaired controller, you must determine the status of the controller and, if necessary, take over the controller so that the healthy controller continues to serve data from the impaired controller storage.

About this task

  • If you have a SAN system, you must have checked event messages (cluster kernel-service show) for the impaired controller SCSI blade. The cluster kernel-service show command (from priv advanced mode) displays the node name, quorum status of that node, availability status of that node, and operational status of that node.

    Each SCSI-blade process should be in quorum with the other nodes in the cluster. Any issues must be resolved before you proceed with the replacement.

  • If you have a cluster with more than two nodes, it must be in quorum. If the cluster is not in quorum or a healthy controller shows false for eligibility and health, you must correct the issue before shutting down the impaired controller; see Synchronize a node with the cluster.

Steps

  1. If AutoSupport is enabled, suppress automatic case creation by invoking an AutoSupport message: system node autosupport invoke -node * -type all -message MAINT=<# of hours>h

    The following AutoSupport message suppresses automatic case creation for two hours: cluster1:> system node autosupport invoke -node * -type all -message MAINT=2h

  2. Disable automatic giveback from the console of the healthy controller: storage failover modify –node local -auto-giveback false

    Note When you see Do you want to disable auto-giveback?, enter y.

  3. Take the impaired controller to the LOADER prompt:

    If the impaired controller is displaying…​ Then…​

    The LOADER prompt

    Go to the next step.

    Waiting for giveback…​

    Press Ctrl-C, and then respond y when prompted.

    System prompt or password prompt

    Take over or halt the impaired controller from the healthy controller: storage failover takeover -ofnode impaired_node_name

    When the impaired controller shows Waiting for giveback…​, press Ctrl-C, and then respond y.
Option 2: Controller is in a two-node MetroCluster

To shut down the impaired controller, you must determine the status of the controller and, if necessary, switch over the controller so that the healthy controller continues to serve data from the impaired controller storage.

About this task

  • You must leave the power supplies turned on at the end of this procedure to provide power to the healthy controller.

Steps

  1. Check the MetroCluster status to determine whether the impaired controller has automatically switched over to the healthy controller: metrocluster show

  2. Depending on whether an automatic switchover has occurred, proceed according to the following table:

    If the impaired controller…​ Then…​

    Has automatically switched over

    Proceed to the next step.

    Has not automatically switched over

    Perform a planned switchover operation from the healthy controller: metrocluster switchover

    Has not automatically switched over, you attempted switchover with the metrocluster switchover command, and the switchover was vetoed

    Review the veto messages and, if possible, resolve the issue and try again. If you are unable to resolve the issue, contact technical support.

  3. Resynchronize the data aggregates by running the metrocluster heal -phase aggregates command from the surviving cluster.

    controller_A_1::> metrocluster heal -phase aggregates
[Job 130] Job succeeded: Heal Aggregates is successful.

    If the healing is vetoed, you have the option of reissuing the metrocluster heal command with the -override-vetoes parameter. If you use this optional parameter, the system overrides any soft vetoes that prevent the healing operation.

  4. Verify that the operation has been completed by using the metrocluster operation show command.

    controller_A_1::> metrocluster operation show
    Operation: heal-aggregates
      State: successful
Start Time: 7/25/2016 18:45:55
   End Time: 7/25/2016 18:45:56
     Errors: -

  5. Check the state of the aggregates by using the storage aggregate show command.

    controller_A_1::> storage aggregate show
Aggregate     Size Available Used% State   #Vols  Nodes            RAID Status
--------- -------- --------- ----- ------- ------ ---------------- ------------
...
aggr_b2    227.1GB   227.1GB    0% online       0 mcc1-a2          raid_dp, mirrored, normal...

  6. Heal the root aggregates by using the metrocluster heal -phase root-aggregates command.

    mcc1A::> metrocluster heal -phase root-aggregates
[Job 137] Job succeeded: Heal Root Aggregates is successful

    If the healing is vetoed, you have the option of reissuing the metrocluster heal command with the -override-vetoes parameter. If you use this optional parameter, the system overrides any soft vetoes that prevent the healing operation.

  7. Verify that the heal operation is complete by using the metrocluster operation show command on the destination cluster:

    mcc1A::> metrocluster operation show
  Operation: heal-root-aggregates
      State: successful
 Start Time: 7/29/2016 20:54:41
   End Time: 7/29/2016 20:54:42
     Errors: -

  8. On the impaired controller module, disconnect the power supplies.

Step 2: Remove the controller module

To access components inside the controller module, you must remove the controller module from the chassis.

You can use the following animation, illustration, or the written steps to remove the controller module from the chassis.

Animation - Remove the controller module
Releasing the controller module

Callout number 1

Locking latches

Callout number 2

Controller moves slightly out of chassis

  1. If you are not already grounded, properly ground yourself.

  2. Release the power cable retainers, and then unplug the cables from the power supplies.

  3. Loosen the hook and loop strap binding the cables to the cable management device, and then unplug the system cables and SFPs (if needed) from the controller module, keeping track of where the cables were connected.

    Leave the cables in the cable management device so that when you reinstall the cable management device, the cables are organized.

  4. Remove the cable management device from the controller module and set it aside.

  5. Press down on both of the locking latches, and then rotate both latches downward at the same time.

    The controller module moves slightly out of the chassis.

  6. Slide the controller module out of the chassis.

    Make sure that you support the bottom of the controller module as you slide it out of the chassis.

  7. Place the controller module on a stable, flat surface.

Step 3: Replace system DIMMs

Replacing a system DIMM involves identifying the target DIMM through the associated error message, locating the target DIMM using the FRU map on the air duct, and then replacing the DIMM.

You can use the following animation, illustration, or the written steps to replace a system DIMM.

Note The animation and illustration show empty slots for sockets without DIMMs. These empty sockets are populated with blanks.
Animation - Replace a system DIMM
Moving the DIMMs

Callout number 1

DIMM locking tabs

Callout number 2

DIMM

Callout number 3

DIMM socket

The DIMMs are located in sockets 2, 4, 13, and 15. The NVDIMM is located in slot 11.

  1. Open the air duct:

    1. Press the locking tabs on the sides of the air duct in toward the middle of the controller module.

    2. Slide the air duct toward the back of the controller module, and then rotate it upward to its completely open position.

  2. Locate the DIMMs on your controller module.

  3. Note the orientation of the DIMM in the socket so that you can insert the replacement DIMM in the proper orientation.

  4. Eject the DIMM from its socket by slowly pushing apart the two DIMM ejector tabs on either side of the DIMM, and then slide the DIMM out of the socket.

    Note Carefully hold the DIMM by the edges to avoid pressure on the components on the DIMM circuit board.

  5. Remove the replacement DIMM from the antistatic shipping bag, hold the DIMM by the corners, and align it to the slot.

    The notch among the pins on the DIMM should line up with the tab in the socket.

  6. Make sure that the DIMM ejector tabs on the connector are in the open position, and then insert the DIMM squarely into the slot.

    The DIMM fits tightly in the slot, but should go in easily. If not, realign the DIMM with the slot and reinsert it.

    Note Visually inspect the DIMM to verify that it is evenly aligned and fully inserted into the slot.

  7. Push carefully, but firmly, on the top edge of the DIMM until the ejector tabs snap into place over the notches at the ends of the DIMM.

  8. Close the air duct.

Step 4: Install the controller module

After you have replaced the component in the controller module, you must reinstall the controller module into the chassis, and then boot it.

You can use the following animation, illustration, or the written steps to install the controller module in the chassis.

Animation - Install the controller module
Installing the controller

Callout number 1

Controller module

Callout number 2

Controller locking latches

  1. If you have not already done so, close the air duct.

  2. Align the end of the controller module with the opening in the chassis, and then gently push the controller module halfway into the system.

    Note Do not completely insert the controller module in the chassis until instructed to do so.

  3. Cable the management and console ports only, so that you can access the system to perform the tasks in the following sections.

    Note You will connect the rest of the cables to the controller module later in this procedure.

  4. Complete the installation of the controller module:

    1. Plug the power cord into the power supply, reinstall the power cable locking collar, and then connect the power supply to the power source.

    2. Using the locking latches, firmly push the controller module into the chassis until the locking latches begin to rise.

      Note Do not use excessive force when sliding the controller module into the chassis to avoid damaging the connectors.

    3. Fully seat the controller module in the chassis by rotating the locking latches upward, tilting them so that they clear the locking pins, gently push the controller all the way in, and then lower the locking latches into the locked position.

      The controller module begins to boot as soon as it is fully seated in the chassis. Be prepared to interrupt the boot process.

    4. If you have not already done so, reinstall the cable management device.

    5. Interrupt the normal boot process and boot to LOADER by pressing Ctrl-C.

      Note If your system stops at the boot menu, select the option to boot to LOADER.

    6. At the LOADER prompt, enter bye to reinitialize the PCIe cards and other components.

Step 5: Restore the controller module to operation

You must recable the system, give back the controller module, and then reenable automatic giveback.

  1. Recable the system, as needed.

    If you removed the media converters (QSFPs or SFPs), remember to reinstall them if you are using fiber optic cables.

  2. Return the controller to normal operation by giving back its storage: storage failover giveback -ofnode impaired_node_name

  3. If automatic giveback was disabled, reenable it: storage failover modify -node local -auto-giveback true

Step 6: Switch back aggregates in a two-node MetroCluster configuration

After you have completed the FRU replacement in a two-node MetroCluster configuration, you can perform the MetroCluster switchback operation. This returns the configuration to its normal operating state, with the sync-source storage virtual machines (SVMs) on the formerly impaired site now active and serving data from the local disk pools.

This task only applies to two-node MetroCluster configurations.

Steps

  1. Verify that all nodes are in the enabled state: metrocluster node show

    cluster_B::>  metrocluster node show

DR                           Configuration  DR
Group Cluster Node           State          Mirroring Mode
----- ------- -------------- -------------- --------- --------------------
1     cluster_A
              controller_A_1 configured     enabled   heal roots completed
      cluster_B
              controller_B_1 configured     enabled   waiting for switchback recovery
2 entries were displayed.

  2. Verify that resynchronization is complete on all SVMs: metrocluster vserver show

  3. Verify that any automatic LIF migrations being performed by the healing operations were completed successfully: metrocluster check lif show

  4. Perform the switchback by using the metrocluster switchback command from any node in the surviving cluster.

  5. Verify that the switchback operation has completed: metrocluster show

    The switchback operation is still running when a cluster is in the waiting-for-switchback state:

    cluster_B::> metrocluster show
Cluster              Configuration State    Mode
--------------------	------------------- 	---------
 Local: cluster_B configured       	switchover
Remote: cluster_A configured       	waiting-for-switchback

    The switchback operation is complete when the clusters are in the normal state.:

    cluster_B::> metrocluster show
Cluster              Configuration State    Mode
--------------------	------------------- 	---------
 Local: cluster_B configured      		normal
Remote: cluster_A configured      		normal

    If a switchback is taking a long time to finish, you can check on the status of in-progress baselines by using the metrocluster config-replication resync-status show command.

  6. Reestablish any SnapMirror or SnapVault configurations.

Step 7: Return the failed part to NetApp

Return the failed part to NetApp, as described in the RMA instructions shipped with the kit. See the Part Return and Replacements page for further information.