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# About restoring the appliance

Restoring an appliance from a backup file replaces all management data and most configuration settings with the data and settings in the backup file, including user names and passwords, audit logs, and available networks.

The appliance is not operational during the restore operation and it can take several hours to perform; the more resources and devices to restore, the longer the restore operation takes. A restore operation cannot be canceled or undone after it has started. The appliance blocks login requests while a restore operation is in progress.

| IMPORTANT: A restore operation is required to recover from catastrophic failures, not to fix minor problems that can be resolved in other ways.

Therefore, after the restore operation is complete, you can restore an appliance from a backup file that was created on the same appliance or, if an appliance fails and cannot be repaired, from a backup file from a different appliance. In this case, the backup file must have been created from an appliance running the same version of HPE OneView.

Actions during the restore operation | Description
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Validates the resource inventory | During a restore operation, the appliance firmware validates the resource inventory (enclosures, servers, interconnects) and reconciles the data in the backup file with the current state of the managed environment. The state of the managed environment is likely to be different from the state of that environment at the time the backup file was created. After the restore operation, the appliance uses alerts to report any discrepancies that it cannot resolve automatically. If you removed, and then re-added an enclosure after a backup file was created, and then perform a restore operation using that backup file, you must refresh the enclosure before the appliance can connect. If you added server hardware to the appliance after the backup file was created, that hardware is not in the appliance database when the restore operation completes. You must add that hardware to the appliance and then repeat any other configuration changes (such as assigning server profiles) that were made between the time the backup file was created and the restore operation completed.
Rediscovers enclosures to validate contents | During the restore operation, the appliance rediscovers each enclosure to validate its contents—especially to ensure that the appliance still claims them. Then the appliance rediscovers each server and clears the virtual IDs of any servers added to an enclosure since the last time the backup file was created. The appliance also refreshes all rack servers to ensure they are claimed.
Clears virtual IDs | The appliance clears virtual IDs for server hardware that does not have a profile assigned but does have virtual IDs configured. These servers most likely had a profile assigned after the last backup was made.

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