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| .Dd May 15, 2020 |
| .Dt ZPOOL-ATTACH 8 |
| .Os |
| . |
| .Sh NAME |
| .Nm zpool-attach |
| .Nd attach new device to existing ZFS vdev |
| .Sh SYNOPSIS |
| .Nm zpool |
| .Cm attach |
| .Op Fl fsw |
| .Oo Fl o Ar property Ns = Ns Ar value Oc |
| .Ar pool device new_device |
| . |
| .Sh DESCRIPTION |
| Attaches |
| .Ar new_device |
| to the existing |
| .Ar device . |
| The existing device cannot be part of a raidz configuration. |
| If |
| .Ar device |
| is not currently part of a mirrored configuration, |
| .Ar device |
| automatically transforms into a two-way mirror of |
| .Ar device |
| and |
| .Ar new_device . |
| If |
| .Ar device |
| is part of a two-way mirror, attaching |
| .Ar new_device |
| creates a three-way mirror, and so on. |
| In either case, |
| .Ar new_device |
| begins to resilver immediately and any running scrub is cancelled. |
| .Bl -tag -width Ds |
| .It Fl f |
| Forces use of |
| .Ar new_device , |
| even if it appears to be in use. |
| Not all devices can be overridden in this manner. |
| .It Fl o Ar property Ns = Ns Ar value |
| Sets the given pool properties. |
| See the |
| .Xr zpoolprops 7 |
| manual page for a list of valid properties that can be set. |
| The only property supported at the moment is |
| .Sy ashift . |
| .It Fl s |
| The |
| .Ar new_device |
| is reconstructed sequentially to restore redundancy as quickly as possible. |
| Checksums are not verified during sequential reconstruction so a scrub is |
| started when the resilver completes. |
| Sequential reconstruction is not supported for raidz configurations. |
| .It Fl w |
| Waits until |
| .Ar new_device |
| has finished resilvering before returning. |
| .El |
| . |
| .Sh SEE ALSO |
| .Xr zpool-add 8 , |
| .Xr zpool-detach 8 , |
| .Xr zpool-import 8 , |
| .Xr zpool-initialize 8 , |
| .Xr zpool-online 8 , |
| .Xr zpool-replace 8 , |
| .Xr zpool-resilver 8 |