> # About High Availability

> Process restartability provides the high availability functionality in Cisco MDS 9000 Family switches. This process ensures that process-level failures do not cause system-level failures. It also restarts the failed processes automatically. This process is able to restore its state prior to the failure and continues executing from the failure point going forward.

> An HA switchover has the following characteristics:

> - It is stateful (nondisruptive) because control traffic is not impacted.
> - It does not disrupt data traffic because the switching modules are not impacted.
> - Switching modules are not reset.

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