NEX-6088 ZFS scrub/resilver take excessively long due to issuing lots of random IO
Reviewed by: Roman Strashkin <roman.strashkin@nexenta.com>
Reviewed by: Sanjay Nadkarni <sanjay.nadkarni@nexenta.com>

*** 207,217 ****
           * Currently resilvering a vdev
           */
          (void) nvlist_lookup_uint64_array(nvroot, ZPOOL_CONFIG_SCAN_STATS,
              (uint64_t **)&ps, &psc);
          if (ps && ps->pss_func == POOL_SCAN_RESILVER &&
!             ps->pss_state == DSS_SCANNING)
                  return (ZPOOL_STATUS_RESILVERING);
  
          /*
           * Pool last accessed by another system.
           */
--- 207,217 ----
           * Currently resilvering a vdev
           */
          (void) nvlist_lookup_uint64_array(nvroot, ZPOOL_CONFIG_SCAN_STATS,
              (uint64_t **)&ps, &psc);
          if (ps && ps->pss_func == POOL_SCAN_RESILVER &&
!             (ps->pss_state == DSS_SCANNING || ps->pss_state == DSS_FINISHING))
                  return (ZPOOL_STATUS_RESILVERING);
  
          /*
           * Pool last accessed by another system.
           */