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--- computing:storage:zfs_snapshot [2021/07/08 11:11]
gcooper
+++ computing:storage:zfs_snapshot [2024/04/05 06:59] (current)
gcooper
@@ Line 1: / Line 1: @@
 ====== ZFS Snapshots ======
-https://docs.oracle.com/cd/E23824_01/html/821-1448/gavvx.html
+**Oracle Documentation**: https://docs.oracle.com/cd/E23824_01/html/821-1448/gavvx.html
-ZFS snapshots can be a fast and easy way to perform backups.
+**Napp-IT Replication Docs**: https://www.napp-it.org/extensions/replication.html
-:!: Napp-IT has a commercial (Pro) module available that performs ZFS snapshots and sends them to another ZFS server.
+**Napp-IT Documentation**: https://napp-it.org/doc/downloads/napp-it.pdf
+<note important>ZFS snapshots can be a fast and easy way to enhance your disaster preparedness.</note>
+:!: Napp-IT has a commercial (Pro) Replication module available that performs ZFS snapshots and pulls them to another ZFS server.
 ===== Recover Data from Snapshots =====
-**Snapshots are automatically mounted** under ''/$MOUNTPOINT/.zfs/snapshot/$SNAPSHOTNAME''.
+==== By File ====
-Example with nested ZFS filesystem showing an NFS storage repository containing VHDs:
+**Snapshots are automatically mounted** (read only) under ''/$FILESYSTEM/.zfs/snapshot/$SNAPSHOTNAME''.  You can use the CLI to copy data you want to recover to another location.
+Example with a (three level) nested ZFS filesystem showing an NFS storage repository containing VHDs:
 <file>
-/toplevel/midlevel/bottomlevel/.zfs/snapshot/job-name-job-ID_year.month.day.hour.min.sec/nfs_SR_ID/
+/toplevelfs/midlevelfs/bottomlevelfs/.zfs/snapshot/job-name-job-ID_year.month.day.hour.min.sec/nfs_sr_id/
 </file>
-You could also **clone the snapshot** if you don't want to muck with ''.zfs'', copy out your files/folders that need recovering, then destroy the clone.
+==== Using Clones ====
+:!: As with snapshots, creating a clone (writeable filesystem) is nearly instantaneous and initially consumes no additional disk space. Clones can only be created from snapshots.
+If you don't want to muck with the ''.zfs'' hidden folder, you could also:
+  - **Clone the snapshot**
+  - Copy out your files/folders that need recovering
+  - Destroy the clone
+==== Rollback ====
+You can use the ZFS rollback feature to discard all changes made to a file system since a specific snapshot was created. The file system reverts to its state at the time the snapshot was taken.
+<note warning>If you roll back, all intermediate snapshots and all clones based on them are destroyed without an undo option.</note>
+For most rollback cases, using Windows and Previous Version is the suggested method for a roll back as you can restrict the rollback to files and folders.
+You can use Napp-IT menu **ZFS-Filesystem -> Rollback** to initiate a rollback.

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