Daniel Pocock wrote (2014/12/05):
> Now it is in the bug tracker:
> http://bugs.bacula.org/view.php?id=2111

"... Data corruption occurs on disks sometimes, e.g. the write to disk
didn't record data correctly on the platter and any attempt to read
it returns the corrupted data. This may just be 1 bit and it may only
occur once in millions of writes but it is known to happen. ..."

You wrote just about disks first, so I responded just about disks too.
After this, you responded with "disks and IO subsystems". And now in bug
tracker, you again write just about disks.

Please:
1) Read atleast Error rates and handling in
   http://en.wikipedia.org/wiki/Hard_disk_drive
2) Be clear on what problem do you have
3) Think about RAM at first - in PCs without ECC, in servers with just
   very simple ECC, much weaker than used in disks and on the tapes
4) ... and what about the caches, all storages and all communication
   paths along the path? What all we know about them? Almost nothing?
   Checking just the spool disks (with all related subsystems needed to
   check these) is very narrow view of such a complex thing

-- 
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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