How do I list zfs snapshots?

How do I list zfs snapshots?

To list the snapshots created for a specific file system, enter zfs list -r -t snapshot followed by the file system name. In the example above, the snapshots created for the file system rpool/export/home are listed. This information is displayed by using the name and creation properties.

How do I delete zfs snapshots?

To find the used snapshot space, run:

1. zfs list -o space. To delete all ZFS snapshots, run:
2. zfs list -H -o name -t snapshot | xargs -n1 zfs destroy. Failed to delete dataset: cannot destroy snapshot dataset is busy.
3. zfs holds raid/[email protected]”
4. zfs release -r freenas:repl raid/[email protected].

What is Solaris snapshot?

Oracle Solaris Administration: ZFS File Systems Oracle Solaris 11 Information Library. Search Scope: Preface. 1. Oracle Solaris ZFS File System (Introduction)

What is zfs snapshot?

zfs snapshot is a read-only copy of zfs file system or volume. They consume no extra space in the zfs pool and can be created instantly. They can be used to save a state of file system at particular point of time and can later be rolled back to exactly same state.

Are ZFS snapshots backups?

Since these snapshots contain all blocks for the data in question and since they are read only and immutable, they are IMO a backup.

Where are snapshots stored ZFS?

Snapshots of file systems are accessible in the . zfs/snapshot directory within the root of the file system. For example, if tank/home/ahrens is mounted on /home/ahrens , then the tank/home/ahrens@thursday snapshot data is accessible in the /home/ahrens/. zfs/snapshot/thursday directory.

How much space do ZFS snapshots use?

The actual meta-data of snapshots are negligible. As a copy-on-write file system, ZFS snapshots only require space for modified data; creating a snapshot does not immediately duplicate everything. If you have a snapshot of given size, and then add or modify files summing up to 100GB, the snapshot will “cost” you 100GB.

How do I clean up my ZFS?

How To Delete Files on a ZFS Filesystem that is 100% Full

1. increase the quota if there is space in the zpool left.
2. Shrink the size of a zvol.
3. temporarily destroy a dump device (if the rpool is affected)
4. delete unused snapshots.
5. increase the space in the zpool by enlarging a vdev or adding a vdev.

How much space does a ZFS snapshot take?

As a copy-on-write file system, ZFS snapshots only require space for modified data; creating a snapshot does not immediately duplicate everything. If you have a snapshot of given size, and then add or modify files summing up to 100GB, the snapshot will “cost” you 100GB.

Is a ZFS snapshot a backup?

Are ZFS snapshots immutable?

Yes, absolutely. ZFS snapshots are immutable, such that once a snapshot is created nothing can change it (until to destroy the snapshot). Not designed to help with ransomware, but is a perfect use case they’d protect against. (You also want backups, of course).