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Re: [Bug-tar] Possible tar bug

From: bocek . pavel
Subject: Re: [Bug-tar] Possible tar bug
Date: Thu, 30 Dec 2010 16:05:38 +0100 (CET)

sudo tar -cMf /dev/st0 /path/1* (tape 1)
sudo tar -rMf /dev/st0 /path/A* (tape 1)
sudo tar -rMf /dev/st0 /path/B* (tape 1, 2)
sudo tar -rMf /dev/st0 /path/C* (tape 2, 3, 4, 5, 6)
sudo tar -rMf /dev/st0 /path/D* (tape 6)
sudo tar -rMf /dev/st0 /path/F* (tape 6, 7)
sudo tar -rMf /dev/st0 /path/G* (tape 7, 8)

Then our problem appeared when the tar came to the 14GB file I already 
specified. As I said, I tried to repeat the last command with tape 7 inserted, 
then again changed to tape 8 but it was the same. So I continued with:

sudo tar -rMf /dev/st0 /path/H* (tape 7, 8)

which run fine. Than again

sudo tar -rMf /dev/st0 /path/G* (tape 8, 9)

but same problem. Than I tried

sudo tar -cMf /dev/st0 /path/G* (tape 1)

on clear tape, it asked for second one but I did not continue since it was 
probably running fine.

So, is there a way how to get this file to this archive, or I can only backup 
everything but this one and place it into next archive, probably when I'll 
start backupping another folder?

> ------------ Původní zpráva ------------
> Od: Paul Eggert <address@hidden>
> Předmět: Re: [Bug-tar] Possible tar bug
> Datum: 30.12.2010 07:04:25
> ----------------------------------------
> On 12/29/2010 04:33 AM, address@hidden wrote:
> > I made a mistake, there should be sudo -r instead of -c of course :-) tar 
> > -rMf
> /dev/st0 some_path/G*
> >
> > By last good record I mean files starting with F. If I am not mistaken, 
> > when I
> want to append, it appends to end of last record which was this one. The tar
> then reads the tape from beginning and starts writing after end of the 
> previous
> record (so I don't set the to the end of it manually). IIRC than it asked for
> one tape for writing other G- files and ended with error when it came uppon 
> the
> 14GB one.
> Sorry, I'm having trouble following the scenario.
> Are there three tapes involved, or only two?
> How exactly are the tapes created?  Please list
> all the commands that you enter, starting with
> creating the first tape (so this should use the
> -c option).  And please say when you manually
> change the tapes.

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