Bacula-users

Re: [Bacula-users] Is anyone using >128K blocks with LTO-4 or LTO-5 drives?

2013-09-20 08:25:40
Subject: Re: [Bacula-users] Is anyone using >128K blocks with LTO-4 or LTO-5 drives?
From: Andreas Koch <koch AT esa.informatik.tu-darmstadt DOT de>
To: Thomas <thomas AT ic3s DOT de>
Date: Fri, 20 Sep 2013 14:22:55 +0200
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On 09/20/2013 10:21 AM, Thomas wrote:
> Hi Andreas,
> 
> we are using also LTO-5 with 2M Blocksize and without any Problems.
> 
> Drives and Kernel are:
> 
> Linux 3.2.0-4-amd64 #1 SMP Debian 3.2.46-1+deb7u1 x86_64 GNU/Linux Medium
> Changer    OVERLAND NEO Series IBM      ULTRIUM-TD5 IBM      ULTRIUM-TD5
> 
> the btape tests fails like in your example, but backup and restore are
> working fine.

Many thanks for the data point! When we use Bacula (not just btape) with
larger block sizes (512 KB), our backups abort when bacula fails to read the
tape's header block.

I notice you have IBM drives. Maybe the block size limitation (for some
reason or other) shows just up on HP drives? Our prior IBM LTO-4 drives also
worked quite nicely with larger blocks.

Best,
  Andreas
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