From owner-cvs-all  Thu Sep 23  2:25:10 1999
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From: Matt Dillon <dillon@FreeBSD.org>
Date: Thu, 23 Sep 1999 02:25:05 -0700 (PDT)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/dev/ccd ccd.c
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dillon      1999/09/23 02:25:05 PDT

  Modified files:
    sys/dev/ccd          ccd.c 
  Log:
      Cleanup CCD quite a bit, including adding clarifying comments.
  
      Enhance MIRROR code.  Add a few more sanity checks and implement
      a zone-based disk selector to make use of both disks when reading.
  
      Also implement a read fail-over.  If a read error occurs on one
      disk, the I/O is retried on the other.
  
      NOTE: CCD's mirroring support cannot deal with write errors properly
      in regards to recovery, meaning that 'old' data under a write error may
      be read non-deterministically if you reboot after a write error, and CCD
      certainly cannot deal with a disk changeout.  And it still can't.  Use
      vinum if you are really serious about mirroring.  CCD basically just
      implements a poor-man's mirror.
  
  Revision  Changes    Path
  1.61      +358 -148  src/sys/dev/ccd/ccd.c



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