Bacula-users

Re: [Bacula-users] Read tape written by other backup-software

2008-08-15 05:47:11
Subject: Re: [Bacula-users] Read tape written by other backup-software
From: Arno Lehmann <al AT its-lehmann DOT de>
To: bacula-users AT lists.sourceforge DOT net
Date: Fri, 15 Aug 2008 11:46:47 +0200
Hi,

15.08.2008 09:58, Nils Blanck-Wehde wrote:
> Hello list,
> 
> I just found some very old LTO1-tapes that were written years ago with 
> CA's ARCserve.
> I have a compatible streamer somewhere that I could connect to a linux-box.
> I was wondering, which information about those tapes I can retrieve with 
> btape (or other linux tools).

With btape probably nothing (unless, perhaps, ARCserve uses IBM/ANSI 
tape labels, in which case you might get the tape label printed). I 
doubt that, though.

> It would be especially interesting to see 
> when the tapes were written and how much data is on the tape. I do not 
> need to actually restore any data, I was just curious what's on those tapes.
> Is something like this even possible?

I'd try to dd the first file of the tape and pipe it through hexdump 
or od. You might see some clear-text data, and perhaps playing with 
different encoding (like EBCDIC) and byte-orders reveals a bit more.

> I don't know whether there is a 
> standard for labels on tapes or if tapes contain something like a TOC 
> that can be read by any application.

No, not really... there are ANSI tape labels defined, but those are 
not used by all backup systems. You mainly find them in mainframe/host 
environments.
All the software I know uses proprietary tape formats, though 
sometimes, behind the scenes, tar or dump is used.

Good luck!

Arno

> 
> Best regards, Nils
> 
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-- 
Arno Lehmann
IT-Service Lehmann
Sandstr. 6, 49080 Osnabrück
www.its-lehmann.de

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