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
          
-t flag 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.