Using dedicated ZIL significantly reduces fragmentation:<p><a href="http:&#x2F;&#x2F;www.racktopsystems.com&#x2F;dedicated-zfs-intent-log-aka-slogzil-and-data-fragmentation&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.racktopsystems.com&#x2F;dedicated-zfs-intent-log-aka-s...</a><p>Anyone using ZFS in a serious capacity would have both dedicated ARC and ZIL.