Bacula-users

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

2013-09-17 10:20:18
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: John Drescher <drescherjm AT gmail DOT com>
Date: Tue, 17 Sep 2013 16:16:52 +0200
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> btape: btape.c:1157 Wrote 10000 blocks of 524188 bytes. btape:
> btape.c:609 Wrote 1 EOF to "LTO-4" (/dev/nst0) btape: btape.c:1173 Wrote
> 10000 blocks of 524188 bytes. btape: btape.c:609 Wrote 1 EOF to "LTO-4"
> (/dev/nst0) btape: btape.c:1215 Rewind OK. Got EOF on tape.
> 
> 
> Hmm. Isn't 512K 524288 bytes not 524188 bytes? Could that be the
> problem?

Possibly. But see my bacula-sd.conf here, I did indeed request 524288 bytes:

Device {
   Name = LTO-5
   Media Type = LTO-5
   Archive Device = /dev/nst0
   AutomaticMount = yes;               # when device opened, read it
   AlwaysOpen = yes;
   RemovableMedia = yes;
   RandomAccess = no;
   Maximum File Size = 8g;
   Minimum block size = 524288
   Maximum block size = 524288
   Changer Device = /dev/changer
   AutoChanger = yes
   # AHK we want to interrogate the drive, not the changer
   Alert Command = "sh -c 'smartctl -H -l error /dev/sg11'"
   Maximum Spool Size = 3000g
   Spool Directory = /etc/bacula/spooldisk/BaculaSpool
   Maximum Network Buffer Size = 65536
}

I have asked myself about the missing 100 bytes, too, but assumed they might
be some Bacula-internal per-block header (haven't checked that, though).

Best,
  Andreas
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