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| .Dd June 30, 2019 |
| .Dt ZFS-UPGRADE 8 |
| .Os |
| . |
| .Sh NAME |
| .Nm zfs-upgrade |
| .Nd manage on-disk version of ZFS filesystems |
| .Sh SYNOPSIS |
| .Nm zfs |
| .Cm upgrade |
| .Nm zfs |
| .Cm upgrade |
| .Fl v |
| .Nm zfs |
| .Cm upgrade |
| .Op Fl r |
| .Op Fl V Ar version |
| .Fl a Ns | Ns Ar filesystem |
| . |
| .Sh DESCRIPTION |
| .Bl -tag -width "" |
| .It Xo |
| .Nm zfs |
| .Cm upgrade |
| .Xc |
| Displays a list of file systems that are not the most recent version. |
| .It Xo |
| .Nm zfs |
| .Cm upgrade |
| .Fl v |
| .Xc |
| Displays a list of currently supported file system versions. |
| .It Xo |
| .Nm zfs |
| .Cm upgrade |
| .Op Fl r |
| .Op Fl V Ar version |
| .Fl a Ns | Ns Ar filesystem |
| .Xc |
| Upgrades file systems to a new on-disk version. |
| Once this is done, the file systems will no longer be accessible on systems |
| running older versions of ZFS. |
| .Nm zfs Cm send |
| streams generated from new snapshots of these file systems cannot be accessed on |
| systems running older versions of ZFS. |
| .Pp |
| In general, the file system version is independent of the pool version. |
| See |
| .Xr zpool-features 7 |
| for information on features of ZFS storage pools. |
| .Pp |
| In some cases, the file system version and the pool version are interrelated and |
| the pool version must be upgraded before the file system version can be |
| upgraded. |
| .Bl -tag -width "filesystem" |
| .It Fl V Ar version |
| Upgrade to |
| .Ar version . |
| If not specified, upgrade to the most recent version. |
| This |
| option can only be used to increase the version number, and only up to the most |
| recent version supported by this version of ZFS. |
| .It Fl a |
| Upgrade all file systems on all imported pools. |
| .It Ar filesystem |
| Upgrade the specified file system. |
| .It Fl r |
| Upgrade the specified file system and all descendent file systems. |
| .El |
| .El |
| .Sh SEE ALSO |
| .Xr zpool-upgrade 8 |