# Immutable Snapshot (Virtual Lock)

Immutable snapshot (Virtual lock) protects volumes and snapshots from deletion for a set duration. Once applied, the data cannot be deleted accidentally or deliberately, even by a root user. This feature helps defend against any unauthorized change. Commvault offers the Immutable snapshot feature for the HPE Alletra Storage MP / Primera / HPE Alletra 9000 Series / HPE Alletra Storage MP B10000 storage array for primary volumes and replicated volumes. You can enable the Immutable snapshots option on the snapshot primary copy, vault/replica copy or both for the HPE Alletra Storage MP / Primera / HPE Alletra 9000 Series / HPE Alletra Storage MP B10000 storage array.

## Supported versions

Supported only for the HPE Alletra Storage MP Snap engine.

Array | Version
--- | ---
HPE Primera | 4.6.1
HPE Alletra 9000 Series | 9.6.1
HPE Alletra Storage MP B10000 | 10.4.0

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