On Tue, 12 May 2009 08:02:30 +0000
Ulrich Leodolter <ulrich.leodol...@obvsg.at> wrote:
> Hello,
>
> I've configured bacula without block size settings,
> so the default of 63k (126 * 512) are used.
>
> Now i like to change the default block size to 128k.
> Hardware is 2 drive LTO-4 auto changer.
>
> Device {
> Name = Drive-1
> Drive Index = 0
> Media Type = LTO-4
> Archive Device = /dev/nst0
> AutomaticMount = yes
> AlwaysOpen = yes
> RemovableMedia = yes
> RandomAccess = no
> Autochanger = yes
> ...
> Minimum block size = 63K
> Maximum block size = 128K
> }
>
> Anyone tried this?
>
> I am concerned about old tapes having 63K block size,
> are they still readable/usable by bacula?
>
I have
Maximum Network Buffer Size = 262144 #65536
Maximum block size = 262144
in each of my Device sections
Works fine and improved performance significantly.
The way I interpreted the Bacula documentation, you'd need to change
the block size back if you want to read the older backups. So maybe
you want to make a note which tapes use which block size. But maybe
(hopefully) I'm wrong and Bacula keeps track of it somewhere.
In my case, I re-ran all full backups after changing block size, and
luckily did not need to refer to any older backups since.
Regards,
--
Alex Chekholko <ch...@pcbi.upenn.edu>
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