zpool-offline —
    take physical devices offline in ZFS storage
  pool
  
    | zpool | offline[--power|[-ft]]
      pool device… | 
  
    | zpool | online[--power]
      [-e] pool
      device… | 
  - zpool- offline[- --power|[- -ft]]
    pool device…
- Takes the specified physical device offline. While the
      device is offline, no attempt is made to read or
      write to the device. This command is not applicable to spares.
    
      - --power
- Power off the device's slot in the storage enclosure. This flag
          currently works on Linux only
- -f
- Force fault. Instead of offlining the disk, put it into a faulted
          state. The fault will persist across imports unless the
          -tflag was specified.
- -t
- Temporary. Upon reboot, the specified physical device reverts to its
          previous state.
 
- zpool- online[- --power] [- -e]
    pool device…
- Brings the specified physical device online. This command is not
      applicable to spares.
    
      - --power
- Power on the device's slot in the storage enclosure and wait for the
          device to show up before attempting to online it. Alternatively, you
          can set the
          ZPOOL_AUTO_POWER_ON_SLOT
          environment variable to always enable this behavior. This flag
          currently works on Linux only
- -e
- Expand the device to use all available space. If the device is part of
          a mirror or raidz then all devices must be expanded before the new
          space will become available to the pool.