Daniel Pocock wrote (2014/12/04):
> On 04/12/14 18:35, Kern Sibbald wrote:
> > On 12/03/2014 08:49 PM, Daniel Pocock wrote:
> >>
> >> Does Bacula checksum content on the spool disk before sending it to tape?
> >>
> >> To be more explicit, if there is a single bit error on the spool disk,
> >> will it be noticed before going onto tape or would it only be noticed in
> >> future when a file is taken off the tape?
> > 
> > Unless you are running ZFS for the spool disk, the error will only be
> > noticed when the data is read from the tape.
> > 
> 
> In that case, it sounds like a good idea to use ZFS or Btrfs with
> checksums enabled

Hard drives use error correction/detection codes, so single bit error
without any error indication is unlikely. Especially in case of spool
disks, where datas are read shortly after write.

-- 
Rudolf Cejka <cejkar at fit.vutbr.cz> http://www.fit.vutbr.cz/~cejkar
Brno University of Technology, Faculty of Information Technology
Bozetechova 2, 612 66  Brno, Czech Republic

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