Hello,
Chris Lee wrote:
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Marcus
Sent: Saturday, 03 September, 2005 12:27
To: bacula-users@lists.sourceforge.net
Subject: [Bacula-users] Disable hardware compression / Running as root
I'm archiving a lot of video to DLT, and think it
might help to disable hardware compression. DV25
streams are, by definition, compressed and will not
shrink much anyway (if at all).
In the docs it says you disable compression with this:
mt -f /dev/nst0 defcompression 0
But where do you enter that, does it go into
mtx-changer or soemthing? Many of the tapes I have are
used and it appears whoever last used them had hw
compression on.
Enter the mt command on your command line. See also: 'man 1 mt'.
Note that you can only change the compression setting only directly
after loading a tape, as far as I know. Once you wrote data onto a tape,
the drive has to recognize if this is written with or without compressio
and it uses the setting it found. So, you have to load a tape, wait
until the drive settles, disable compression, write data to tape - which
would usually be a bacula label, of course :-)
With ADIC DLT autoloaders you can also initialize the tapes vie their
console. Use format 20, NOT format 20C - C means compression.
Arno
Also, is it possible/advisable to modify permissions
so bacula can be run by a user (me?)? The install
seems to set everything for root/root, will changing
the group to disk hurt anything?
Bacula will need rw permissions for a nubmer of devices depending on your
configuration. Since you're using tape, bacula will need the permissions of
the group which owns your tape device (commonly "tape" or "operator").
Bacula will also need permissions for your tape changer if you have one
(commonly "tape", "operator", or "disk"). Verify the user and group
permissions of your device(s) with "ls -l /dev/nst0" on the commandline.
Some users -- including myself -- have had problems with permissions when
running bacula non-root, so use caution. If all else fails you can "chmod
666" the devices which bacula needs to access. However, this could raise
security concerns.
Thanks list!
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HTH
Thanks,
Chris
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IT-Service Lehmann [EMAIL PROTECTED]
Arno Lehmann http://www.its-lehmann.de
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