Hi,
Florian Schnabel wrote:
i'm curious ..
what mechanism(s) uses bacula to verify that the tape (or any other
storage medium) has written the data correctly ?
e.g. would it notice if my tape is damaged ?
That depends.
Basically, Bacula relies on the drives abilities to detect write errors
(Read after Write, current drives should do this automatically and
report an error to controller, which goes through the driver to the
application).
If you don't want to rely on this, you can only re-read and compare the
complete drive's contents. This is not something bacula supports,
(although you can compare the metadata - see Verify Jobs in the manual)
and I think this is ok:
First, modern tape drives are quite reliable.
Second, todays tape capacity makes re-reading a whole backup rather
useless, because they can conatin an amount of data that makes it quite
probable that some of the original data is modified between passes, and
the whole operation would take just too long.
In short, you have to rely on the tape drive itself.
Arno
--
IT-Service Lehmann [EMAIL PROTECTED]
Arno Lehmann http://www.its-lehmann.de
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