zfs_scrub_limit tunable is not used anywhere #1444

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Commits on May 6, 2013
  1. zfs_scrub_limit tunable is not used anywhere

    imp committed Oct 24, 2012
    As a part of scrub/resilver tuning zfs_scrub_limit fell out of use,
    but the definition of the variable remained in place.
    Moreover various guides still (misleadingly) mention it as a way
    to influence resilver/scrub behavior.
    This commit removes its finally.
    
    Signed-off-by: Cyril Plisko <cyril.plisko@mountall.com>