Re: [Bacula-users] LTO speed optimisation

Hi Alan,

> It isn't a problem as long as you close off all tapes with smaller block
> sizes _before_ reconfiguring bacula for the larger block size.

That's great, thanks for letting me know; it's not clear from the manual that that should work. I won't be able to make this change right now as I'm about to hit the end-of-year backup window where the tapes run solidly for a few weeks, but it's definitely something I'll try toward the end of January! I will just need to pick a good time to make the change so I don't have to waste barely-used tapes.

Regards,
Ben Roberts

> -----Original Message-----
> From: Alan Brown [mailto:a.brown AT ucl.ac DOT uk]
> Sent: 17 December 2014 13:50
> To: Roberts, Ben; Cejka Rudolf; Bryn Hughes; Radosław Korzeniewski; Kern
> Sibbald
> Cc: bacula-users AT lists.sourceforge DOT net
> Subject: Re: [Bacula-users] LTO speed optimisation
>
> On 17/12/14 11:32, Roberts, Ben wrote:
>
> > > I think (and hope) that the only problem you will get into, is that
> > if you > write a volume with 512K blocks, currently, you will not be
> > able to read it > back with a Bacula configured for 64K block sizes.
> >
> > My main concern is reconfiguring Bacula to write larger block sizes,
> > then not be able to read older media with smaller block sizes if I
> > have to restore old data. If you don't think this will be a problem,
> > then I'm happy to try and report back. The warnings in the
> > documentation have scared me off doing this so far.
>
>
> It isn't a problem as long as you close off all tapes with smaller block
> sizes _before_ reconfiguring bacula for the larger block size.
>
> Bacula cannot handle having the block size change midway through a tape.
> Apart from that if it is configured for larger blocks it will read
> smaller-block tapes happily.
>

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