How do I access ZFS snapshots?
You can enable or disable the display of snapshot listings in the zfs list output by using the listsnapshots pool property. This property is enabled by default. Snapshots of file systems are accessible in the . zfs/snapshot directory within the root of the file system.
How do I restore a ZFS snapshot?
You can use the zfs rollback command 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. By default, the command cannot roll back to a snapshot other than the most recent snapshot.
Is a ZFS snapshot a backup?
Since these snapshots contain all blocks for the data in question and since they are read only and immutable, they are IMO a backup.
What is a ZFS snapshot?
A ZFS snapshot is a copy of a data set or a volume that takes up nearly zero space and can be created almost instantly due to ZFS’s copy-on-write (CoW) architecture. Unlike other traditional filesystems, when data is modified in ZFS, the data is written to a new block rather than overwriting the old data in its place.
How do I list all ZFS snapshots?
Displaying a ZFS Snapshot 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.
What are ZFS snapshots?
How do I create a ZFS snapshot?
Solaris ZFS : How to Create / Rename / Rollback / Destroy a ZFS…
- Note: To create a recursive snapshot, use zfs “snapshot -r” and the snapshot name (for example, zfs snapshot -r datapool/home@now).
- Note: Snapshots must be renamed within the same pool and data set from which they were created.
How does ZFS snapshot work?
How much space do ZFS snapshots use?
Based on this test, it seems that ZFS needs about 3.9 MiB of space for storing metadata for each snapshot on a 200GiB zpool. This appears to vary by pool size; when I tested with a 20GiB zpool, it came out to ~1.8 MiB/snapshot.
Where are ZFS snapshots actually stored?
jrodder. I am sure this is a silly question.
How to use ZFS snapshots and clones?
Snapshot naming. Snapshot names consist of the name of the filesystem,followed by an@and the name of the snapshot.
Is ZFS worth it on a single disk?
Zfs doesn’t modify blocks, it always writes changes to a new block and then updates the block pointer. I use ZFS on single drive SSDs all the time, mostly for snapshots and send/receive. I mitigate the lack of trim by overprovisioning and leaving 20-30% empty space after blkdiscard’ing the full drive.
Should I use ZFS?
People may create an impression that not using ZFS is incredibly dangerous and that you’re foolish if you don’t use ZFS for your home NAS.