NAME

     zpool-attach — attach new device to existing ZFS vdev

SYNOPSIS

     zpool attach [-fsw] [-o property=value] pool device new_device

DESCRIPTION

     Attaches new_device to the existing device.  The existing device cannot be part of a raidz
     configuration.  If device is not currently part of a mirrored configuration, device
     automatically transforms into a two-way mirror of device and new_device.  If device is part
     of a two-way mirror, attaching new_device creates a three-way mirror, and so on.  In either
     case, new_device begins to resilver immediately and any running scrub is cancelled.

     -f      Forces use of new_device, even if it appears to be in use.  Not all devices can be
             overridden in this manner.

     -o property=value
             Sets the given pool properties.  See the zpoolprops(7) manual page for a list of
             valid properties that can be set.  The only property supported at the moment is
             ashift.

     -s      The 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.

     -w      Waits until new_device has finished resilvering before returning.

SEE ALSO

     zpool-add(8), zpool-detach(8), zpool-import(8), zpool-initialize(8), zpool-online(8),
     zpool-replace(8), zpool-resilver(8)