Hi,
On 3/3/2006 9:32 AM, Thomas Franz wrote:
Am Donnerstag, 2. März 2006 23:11 schrieb Arno Lehmann:
On 3/2/2006 2:03 PM, Thomas Franz wrote:
Hello,
I am very new to bacula. My question : Is it possible (e.g. with
bconsole) to seek the "append position" of a tape after rewinding the
tape because of a restore etc.
No. The only way to position to EOD is by starting a job which uses the
volume.
In the case of a backup run it takes a long time ( up to hours ) until
the storage daemon is finding the end-of-data position . ( Of course
only if the tape is nearly full).
Well, any other repositioning command Bacula could implement would
probably use the same methods, so would be exactly as fast or slow as
what you observe.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Of course , but not at that time the backup should start.
It would be a nice feature to do this before.
I see two possible solutions, or rather one solution consisting of two
parts.
First, start a small job - perhaps a dummy one which will never find any
data - some time before your real backup jobs run. Then, make sure the
device stays opened and is not rewound in-between, which should already
be achived by the default strage device settings. I suppose you'd have
to use the non-rewinding device file and set AlwaysOpen to Yes if it
doesn't work.
Concerning the FreeBSD settings, you might find re-reading the manual
chapter "Tape Modes on FreeBSD" or perhaps asking again with "FreeBSD"
in the subject line as that might alert some FreeBSD users with better
knowledge of these things.
We are using bacula 1.36.3 on a FreeBSD 4.11 machine.
The backup hardware is an EXABYTE Changer with an IBM LTO-3 drive.
It seems to work well after testing with btape and using the following
parameters:
...
Hardware End of Medium = no
BSF at EOM = yes
Backward Space Record = no
Fast Forward Space File = no
This setting might influence the positioning time a lot. Have you tried
running btape with this set to on?
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Yes, but no success.
Does btape report a different behaviour between runs with it set to of
and to on?
Also, you might try using mt to position a tape to EOD and to try the
FSF commands to see if is as slow as Bacula - after all, it is possible
that your tape drive or driver behaves differently than what Bacula expects.
Arno
--
IT-Service Lehmann [EMAIL PROTECTED]
Arno Lehmann http://www.its-lehmann.de
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