A VNX is configured with a primary and a standby Data Mover. What happens to the file systems
exported from the primary Data Mover if the connected network fails?
A.
The VNX file systems are unavailable.
B.
The VNX file systems remain available with degraded performance.
C.
The standby Data Mover takes over operation. After network connection is re-established,
operation fails back.
D.
The standby Data Mover takes over operation. After network connection is re-established,
operation will not fail back.
I think “D” is correct.
When any failover condition occurs, you can transfer functionality from the Primary to the standby Data Mover without disrupting the availability of the file system. The standby Data Mover assumes the following identities from the faulted Data Mover:
Network identity — IP and MAC addresses of all its NICs
Storage identity — File systems controlled by the faulted Data Mover
Service identity — Shares and exports controlled by the faulted Data Mover
The Standby Data Mover assumes user file system services (if the policy is set to automatic) within a few seconds of the failure, transparently, and without requiring users to unmount and remount the file system.
The definition of failover is the process of immediately routing data to an alternate data path or device to avoid interrupting services in the event of a failure. The impact to service is dependent on the application’s ability to handle the change gracefully. During normal operation, the VNX Control Station continually monitors the status of all Data Movers. If a Primary Data Mover fails, the Control Station detects the failure via the NAS Master Control Daemon communication over the dedicated network. It instructs the Standby Data Mover to take over as Primary while forcing the original Primary, if it is still running, into a failed state.
Once failover is enacted, the Standby Data Mover becomes the Primary and resumes the entire identity of the failed Data Mover. In most cases, this process should have little, or no noticeable effect on user access to data.
The Data Mover failover process works the same way in systems with two Control Stations. In the event of a Primary Control Station failure the Standby Control Station assumes the Primary role and it is responsible for the Data Mover failover.
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the correct Answer is A , a network failure will not generate a DM failover
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A
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