Pool device failures, such as temporarily losing connectivity, can cause errors that are also reported in a zpool status output. To clear such errors, use the following command:
$ zpool clear pool [devices]
If devices are specified, the command clears only those errors that are associated with the devices. Otherwise, the command clears all device errors within the pool.
For more information about clearing zpool errors, see Clearing Transient or Persistent Device Errors.