Commits on Jul 3, 2017

1. Implemented zpool scrub pause/resume …

   Currently, there is no way to pause a scrub. Pausing may
   be useful when the pool is busy with other I/O to preserve
   bandwidth.
   
   This patch adds the ability to pause and resume scrubbing.
   This is achieved by maintaining a persistent on-disk scrub state.
   While the state is 'paused' we do not scrub any more blocks.
   We do however perform regular scan housekeeping such as
   freeing async destroyed and deadlist blocks while paused.
   
   Signed-off-by: Alek Pinchuk <apinchuk@datto.com>

   

   alek-p committed Jul 3, 2017
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