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From: Alexander Motin <mav@FreeBSD.org>
Date: Fri, 29 Jul 2011 20:30:28 +0000 (UTC)
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Subject: cvs commit: src/sys/cam cam_periph.c
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mav         2011-07-29 20:30:28 UTC

  FreeBSD src repository

  Modified files:
    sys/cam              cam_periph.c 
  Log:
  SVN rev 224496 on 2011-07-29 20:30:28Z by mav
  
  In some cases failed SATA disks may report their presence, but don't
  respond to any commands. I've found that because of multiple command
  retries, each of which cause 30s timeout, bus reset and another retry or
  requeue for many commands, it may take ages to eventually drop the
  failed device. The odd thing is that those retries continue even after
  XPT considered device as dead and invalidated it.
  
  This patch makes cam_periph_error() to block any command retries after
  periph was marked as invalid. With that patch all activity completes in
  1-2 minutes, just after several timeouts, required to consider device
  death. This should make ZFS, gmirror, graid, etc. operation more robust.
  
  Reviewed by:    mjacob@ on scsi@
  
  Approved by:    re (kib)
  
  Revision  Changes    Path
  1.97      +19 -8     src/sys/cam/cam_periph.c