help restoring a corrupt /dev file

[asumoactingbig]

I'm in a dilley of a pickle here. In my great ignorance I
accidentally corrupted my /dev/rst0 file by cp'ing another file to it.
(dumb, I know) Of course all my backups are on tape and now, when I
try to access the drive I get an I/O error. Not too surprising I
suppose. I've got a good copy of my filesystem on tape so if I could
manage to run a restore session I think I could replace the file. How
do I fix this?

[Andreas Kahari]

In article <bac833fe.0311031205.6c031f13@posting.google.com >, asumoactingbig wrote:

> I'm in a dilley of a pickle here. In my great ignorance I
> accidentally corrupted my /dev/rst0 file by cp'ing another file to it.
> (dumb, I know) Of course all my backups are on tape and now, when I
> try to access the drive I get an I/O error. Not too surprising I
> suppose. I've got a good copy of my filesystem on tape so if I could
> manage to run a restore session I think I could replace the file. How
> do I fix this?

What unix is this? on most free unices you just

cd /dev
./MAKEDEV all

as root to rebuild all devices...

--
Andreas Kähäri

[phn@icke-reklam.ipsec.nu]

asumoactingbig <asumoactingbig@yahoo.com> wrote:

> I'm in a dilley of a pickle here. In my great ignorance I
> accidentally corrupted my /dev/rst0 file by cp'ing another file to it.
> (dumb, I know) Of course all my backups are on tape and now, when I
> try to access the drive I get an I/O error. Not too surprising I
> suppose. I've got a good copy of my filesystem on tape so if I could
> manage to run a restore session I think I could replace the file. How
> do I fix this?

mknod is the command to create devicefiles. What parameters you need
is a function of what OS and version you use.

--
Peter Håkanson
IPSec Sverige ( At Gothenburg Riverside )
Sorry about my e-mail address, but i'm trying to keep spam out,
remove "icke-reklam" if you feel for mailing me. Thanx.

[asumoactingbig]

I'm running OpenBSD 3.2 (i386). Will

/dev/MAKEDEV all

screw up any device files for the rest of the system? Can I just run

/dev/MAKEDEV st0

to rebuild the file I need?


[email]phn@icke-reklam.ipsec.nu[/email] wrote in message news:<bo6ipb$29vk$4@nyheter.ipsec.se>...

> asumoactingbig <asumoactingbig@yahoo.com> wrote:

> > I'm in a dilley of a pickle here. In my great ignorance I
> > accidentally corrupted my /dev/rst0 file by cp'ing another file to it.
> > (dumb, I know) Of course all my backups are on tape and now, when I
> > try to access the drive I get an I/O error. Not too surprising I
> > suppose. I've got a good copy of my filesystem on tape so if I could
> > manage to run a restore session I think I could replace the file. How
> > do I fix this?

>
> mknod is the command to create devicefiles. What parameters you need
> is a function of what OS and version you use.

[phn@icke-reklam.ipsec.nu]

asumoactingbig <asumoactingbig@yahoo.com> wrote:

> I'm running OpenBSD 3.2 (i386). Will

> /dev/MAKEDEV all

> screw up any device files for the rest of the system? Can I just run

That should be ok.

> /dev/MAKEDEV st0

> to rebuild the file I need?

Yes. Thats the best solution

> [email]phn@icke-reklam.ipsec.nu[/email] wrote in message news:<bo6ipb$29vk$4@nyheter.ipsec.se>...

>> asumoactingbig <asumoactingbig@yahoo.com> wrote:

>> > I'm in a dilley of a pickle here. In my great ignorance I
>> > accidentally corrupted my /dev/rst0 file by cp'ing another file to it.
>> > (dumb, I know) Of course all my backups are on tape and now, when I
>> > try to access the drive I get an I/O error. Not too surprising I
>> > suppose. I've got a good copy of my filesystem on tape so if I could
>> > manage to run a restore session I think I could replace the file. How
>> > do I fix this?

>>
>> mknod is the command to create devicefiles. What parameters you need
>> is a function of what OS and version you use.

--
Peter Håkanson
IPSec Sverige ( At Gothenburg Riverside )
Sorry about my e-mail address, but i'm trying to keep spam out,
remove "icke-reklam" if you feel for mailing me. Thanx.

[asumoactingbig]

[email]phn@icke-reklam.ipsec.nu[/email] wrote in message news:<bo7j24$2kfk$1@nyheter.ipsec.se>...

> asumoactingbig <asumoactingbig@yahoo.com> wrote:

> > I'm running OpenBSD 3.2 (i386). Will

>

> > /dev/MAKEDEV all

>

> > screw up any device files for the rest of the system? Can I just run

>
> That should be ok.
>

> > /dev/MAKEDEV st0

>

> > to rebuild the file I need?

> Yes. Thats the best solution

Just tried it and it ran OK but I still get

mt: /dev/rst0: Input/output error

Tried running /dev/MAKEDEV rst0 but it tells me

rst0: unknown device

What am I missing?

[Bill Marcum]

On 4 Nov 2003 06:04:02 -0800, asumoactingbig
<asumoactingbig@yahoo.com> wrote:

> [email]phn@icke-reklam.ipsec.nu[/email] wrote in message news:<bo7j24$2kfk$1@nyheter.ipsec.se>...

>> asumoactingbig <asumoactingbig@yahoo.com> wrote:

>> > I'm running OpenBSD 3.2 (i386). Will

>>

>> > /dev/MAKEDEV all

>>

>> > screw up any device files for the rest of the system? Can I just run

>>
>> That should be ok.
>>

>> > /dev/MAKEDEV st0

>>

>> > to rebuild the file I need?

>> Yes. Thats the best solution

>
>
> Just tried it and it ran OK but I still get
>
> mt: /dev/rst0: Input/output error
>
> Tried running /dev/MAKEDEV rst0 but it tells me
>
> rst0: unknown device
>
> What am I missing?

I don't know about BSD, but in Linux, even though a /dev/whatever
exists, you might need to load a module for some devices. lsmod lists
the modules that are currently loaded.

--
You can go anywhere you want if you look serious and carry a clipboard.

[phn@icke-reklam.ipsec.nu]

asumoactingbig <asumoactingbig@yahoo.com> wrote:

> [email]phn@icke-reklam.ipsec.nu[/email] wrote in message news:<bo7j24$2kfk$1@nyheter.ipsec.se>...

>> asumoactingbig <asumoactingbig@yahoo.com> wrote:

>> > I'm running OpenBSD 3.2 (i386). Will

>>

>> > /dev/MAKEDEV all

>>

>> > screw up any device files for the rest of the system? Can I just run

>>
>> That should be ok.
>>

>> > /dev/MAKEDEV st0

>>

>> > to rebuild the file I need?

>> Yes. Thats the best solution

> Just tried it and it ran OK but I still get

> mt: /dev/rst0: Input/output error

> Tried running /dev/MAKEDEV rst0 but it tells me

> rst0: unknown device

> What am I missing?

Dunno. What does ls -l /dev/st* show ?

"Input/output error" occurs when tapedrives are "not ready" or simular.

Also do a dmesg and search for 'st'

The command 'mt status' could give "interesting" output.

--
Peter Håkanson
IPSec Sverige ( At Gothenburg Riverside )
Sorry about my e-mail address, but i'm trying to keep spam out,
remove "icke-reklam" if you feel for mailing me. Thanx.

[Adam Price]

In news:bac833fe.0311040604.20994171@posting.google.c om,
asumoactingbig <asumoactingbig@yahoo.com> typed:

> Just tried it and it ran OK but I still get
>
> mt: /dev/rst0: Input/output error
>

Try removing the rst0 file first. Under other flavours
of unix I have found that MAKEDEV will only make device
files which are missing.
Adam