The
question should maybe not be
"How can I be certain that the
data written to the tape is the same data that is on my hard disk",
but
"How
can I be certain that the data I restore from tape are the same as I had on my
disk..."
If you
see my meaning.
As a
spot-check, I have restored certain files to alternate directories, and verified
checksums on the original and the restored version. md5/sha1 or
similar.
So
far, I have never seen checksum mismatches, but most of my testing has been when
I first attach a new tape unit, and less than 20 files.
If
your question was about on-going checks of _everything_ that's being sent to the
tape, then that's probably a different issue. There is some checksum options on
your FileSet resource that may address your concern.
Look
into the (excellent) documentation (LITED)
(Or
you can keep spot-checking to the point where you have enough
confidence...)
Spotchecks should also be part of everybody's regular restore testing.
Knut
-----Original Message-----Hi,
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On Behalf Of Pedro Lobo S. da Rocha
Sent: Wednesday, April 06, 2005 1:00 PM
To: [email protected]
Subject: [Bacula-users] Verify data written to the tape
I backup my hard disk to a DLTIV tape. And I would like to know how can i be certain that the data written to the tape is the same data that is on my hard disk.
Thanks.
