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Oracle® ZFS Storage Appliance Administration Guide, Release 2013.1.4.0

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Updated: April 2015
 
 

Snapshotting Shadow File Systems

Shadow filesystems can be snapshotted; however, the state of what is included in the snapshot is arbitrary. Files that have not yet been migrated will not be present, and implementation details (such as SUNWshadow extended attributes) may be visible in the snapshot. This snapshot can be used to restore individual files that have been migrated or modified since the original migration began. Because of this, it is recommended that any snapshots be kept on the source until the migration is completed, so that unmigrated files can still be retrieved from the source if necessary. Depending on the retention policy, it may be necessary to extend retention on the source in order to meet service requirements. While snapshots can be taken, these snapshots cannot be rolled back to, nor can they be the source of a clone.