Sorry for quoting all of this but it's too relevant to let drop. Replies
are inline.
On Wed, Jan 18, 2006 at 10:45:24AM +0100, Kern Sibbald wrote:
> On Wednesday 18 January 2006 06:40, Jo Rhett wrote:
> > On Tue, Jan 17, 2006 at 10:05:58AM +0100, Kern Sibbald wrote:
> > > On Tuesday 17 January 2006 05:40, Jo Rhett wrote:
> > > > Interesting question. I'm getting some odd errors when trying to
> > > > restore data. They don't appear to be affecting anything -- I think
> > > > they happen at end of tape, but I may be wrong.
> > > >
> > > > Here's the Device I set up fresh. I tested this extensively with btape
> > > > and it's happy:
> > > >
> > > > # A FreeBSD tape drive
> > > > Device {
> > > > Name = DDS-3
> > > > Description = "DDS-3 for FreeBSD"
> > > > Media Type = DDS-3
> > > > Archive Device = /dev/nsa0
> > > > AutomaticMount = yes; # when device opened, read it
> > > > AlwaysOpen = no
> > > > Offline On Unmount = no
> > > > Hardware End of Medium = yes
> > > > BSF at EOM = no
> > > > Backward Space Record = no
> > > > Fast Forward Space File = no
> > > > TWO EOF = no
> > > > }
> > > >
> > > > And here is the device I was using when I made the backups:
> > > > (which I got using bextract from one of the tapes that ended this way)
> > > >
> > > > # A FreeBSD tape drive
> > > > Device {
> > > > Name = Seagate
> > > > Description = "DDS-3 for FreeBSD"
> > > > Media Type = DDS-3
> > > > Archive Device = /dev/nsa0
> > > > AutomaticMount = yes; # when device opened, read
> > > > it AlwaysOpen = no
> > > > Offline On Unmount = no
> > > > Hardware End of Medium = no
> > > > BSF at EOM = yes
> > > > Backward Space Record = no
> > > > Fast Forward Space File = no
> > > > TWO EOF = yes
> > > > LabelMedia = no;
> > > > Spool Directory = /space/backups
> > > > Maximum Spool Size = 15000000000
> > > > }
> > > >
> > > > The important differences are clearly:
> > > >
> > > > BSF at EOM = yes
> > > > TWO EOF = yes
> > > >
> > > > So when I'm restoring, the last (or so I believe) backup on the volume
> > > > ends with the following error on 6 of the 10 volumes:
> > > >
> > > > 16-Jan 12:03 bextract: bextract Error: block.c:782 Read error at
> > > > file:blk 8:5061 on device /dev/nsa0. ERR=Operation not permitted.
> > > > 16-Jan 12:03 bextract: bextract Error: Unexpected Tape is Off-line
> > > >
> > > > Is this a hardware problem, (no sa0 errors are reported in the log) or
> > > > a different reading of the tape data?
> > >
> > > It looks to me like Bacula ran off the end of the tape during the
> > > bextract because either TWO EOF is not set correctly for your drive (or
> > > you changed it),
> >
> > So that's the question. Would changing this parameter cause that error?
>
> If you write with one set of directives and read with another, you almost
> certainly will have problems. If you write and read with the same set and
> btape tests pass you should not have problems.
I didn't have a printout of my tape definition, so I worked with the Bacula
documentation and found a setting that worked fine with btape. That was
what's listed with "DDS-3" above.
Obviously I could change it to match the previous setting.
> If you wrote with TWO EOF = yes and try to restore with TWO EOF = no, you
> *could* be seeing the kinds of wierd problems you reported.
So I guess my question is -- with this setting changed, would I lose any
data on the restore? Is it worth changing the settings and starting all
over again? Or is this always going to happen at the end of the tape and
not likely to affect the files restored?
--
Jo Rhett
senior geek
SVcolo : Silicon Valley Colocation
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