Security Key Mismatch; Resolving Security Key Mismatch Using Cmc Web Interface; Viewing Controller Properties Using Cmc Web Interface - Dell EMC PowerEdge VRTX User Manual

functionality is visible, but does not eliminate downtime. Fault Tolerance (FT) makes use of redundant components within a storage
system, which are configured to behave as backup components and are kept in standby mode. Storage Controllers in fault-tolerant
mode prevent disruption of storage services and automatically take over the services of a component that has stopped functioning.
Performance remains consistent throughout this failover process since the redundant components(controllers) are not used during
normal operating conditions.
High Availability with fault-tolerance provides the following benefits:
• Provides uptime for all storage applications even when a controller stops functioning.
• Provides access to critical functions of the chassis at all times.
• Enables server to handle situations when controller stops functioning are becomes faulty.
• Makes use of component redundancy
Using the fault-tolerant feature of controllers, you can manage the tasks associated with shared storage that are achieved by having
an active and passive (peer) controller. Active controller is the controller that is active and monitors all the storage-related processes.
Working status of both controllers are communicated between controllers so that when an active controller stops functioning, the
passive controller acting as a peer hot-spare, takes over in a seamless manner.
NOTE: CMC displays fault-tolerant data for Shared PERC 8's with SR-IOV enabled firmware. If a non-SR-IOV card is
attached to the shared storage slots the card does not power on and an alert is generated.
NOTE: Operations such as resetting CMC, which reset the CMC configuration, reset the external fault-tolerant
configuration. As a result, the PERC mode changes to "Safe mode". Disable the fault-tolerance in the external PERC.

Security Key Mismatch

You can create a security key on a controller using an Encryption keyID and a Passphrase. The controller compares only the
Passphrase used while creating security key to identify whether the two controllers have the same security keys. Therefore, two
controllers joining a cluster are fault-tolerant even if they have different Encryption Key ID as long as they have the same
passphrase.
If a security key mismatch is detected between two peer controllers, the fault-tolerant mode changes to 'Degraded'. A critical alert is
displayed on the Chassis Health page and monitoring may not display proper drive association.
If a security key mismatch is detected, resolve the key mismatch by creating, modifying, or deleting the security key on one of the
controllers, before performing any other storage security operation on the controller. Power cycle the chassis after resolving the
mismatch. Before combining two non-high availability controllers, modify the keys so that they match. This action facilitates import
of secure drives associated with each controller joining the cluster.
For external controllers, modify the keys so that they match before cabling them for fault tolerance. The modification of security
keys facilitates import of secure drives associated with each controller joining the cluster.

Resolving Security Key Mismatch Using CMC Web Interface

To resolve the security key mismatch using the CMC web interface:
1. Turn off the server modules.
2. Click Server Overview → Power → Control → Power Off Server.
3. Modify the security key on one or both of the existing non-fault-tolerant controllers so that the keys match.
4. Power cycle the chassis.
5. Verify if the controllers have matching keys.

Viewing Controller Properties Using CMC Web Interface

To view the controller properties:
1. In the left pane, click Chassis Overview → Controller.
2. On the Controllers page, under the Controllers section, you can see the basic properties of the controller. However, to view the
advanced properties, click the
170
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