Date: Mon, 30 Dec 1996 11:31:47 -0800 (PST) From: Doug White <dwhite@gdi.uoregon.edu> To: Steve Ames <steve@news.cioe.com> Cc: freebsd-questions@freebsd.org Subject: Re: Help! restore problem Message-ID: <Pine.BSI.3.94.961230112528.239B-100000@localhost> In-Reply-To: <199612301702.MAA23201@news.cioe.com>
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> > > I've had a system up for 8 months or so that was running great. Recently its
> > > drive 0 went bad. I'm trying to restore the filesystem from backup but I'm
> > > getting an error message:
> > >
> > > st0: block size wrong, 64 blocks residual
> > > tape read error: Input/output error
> > >
> > > I've backed up and restored a couple of test filesystems and all went
> > > according to plan... I'm not sure what this error indicates or how to
> > > fix it... HELP!!!
> >
> > What were the command line(s) you used to backup & restore?
> >
> Its a conner tapestore tsm 4000R. Its connected to an adaptec 2940.
> The tape type is 'QIC-3080-MC compatible'.
>
> The command I used was:
>
> freebsd# dump 0ufs /dev/nrst0 90000 /
Yuck, the old tape data. :( Read up on the B and b options and use those
instead of the deprecated s and d options. You'll get much better tape
size estimates.
> the restore command I attempted was:
>
> freebsd# restore rf /dev/nrst0
>
> I've used this same setup when the machine was operational (ok restore if,
> not restore rf) and it worked fine.
You will want to read the restore(8) man page if you haven't already. It
has special qualifications for the r 'restore filesystem' option.
>From the manpage:
r Restore (rebuild a file system). The target file system should
be made pristine with newfs(8), mounted and the user cd'd
into the pristine file system before starting the restoration of the
initial level 0 backup. If the level 0 restores successfully, the r key
may be used to restore any necessary incremental backups on top of the
level 0. The r key precludes an interactive file ex- traction and can be
detrimental to one's health if not used care- fully (not to mention the
disk). An example:
newfs /dev/rrp0g eagle
mount /dev/rp0g /mnt
cd /mnt
restore rf /dev/rst8
Note that restore leaves a file restoresymtable in the root
di- rectory to pass information between incremental restore passes. This
file should be removed when the last incremental has been restored.
I would highly suggest using the -b option to specify the blocksize
yourself. Your tape may be very particular about the blocksizes -- I
would say try 64 or 128 as a starting size.
Doug White | University of Oregon
Internet: dwhite@resnet.uoregon.edu | Residence Networking Assistant
http://gladstone.uoregon.edu/~dwhite | Computer Science Major
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