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#1 (**permalink**) 01-05-2008, 07:42 AM

Our Oracle DBA is doing some DR testing and has rm'd /dev/r**** which
was the character special file (raw volume). The other, matching /dev/
entries are there, but that one is gone. Any way to recreate it? I've
never had to create just the character file, usually a whole LV which
makes it automagically.

TIA.

#2 (**permalink**) 01-05-2008, 07:42 AM

John Hillman wrote:
> Our Oracle DBA is doing some DR testing and has rm'd /dev/r**** which
> was the character special file (raw volume). The other, matching /dev/
> entries are there, but that one is gone. Any way to recreate it? I've
> never had to create just the character file, usually a whole LV which
> makes it automagically

I'd say you've shifted from doing DR testing to DR

#3 (**permalink**) 01-05-2008, 07:42 AM

John Hillman wrote:
> Our Oracle DBA is doing some DR testing and has rm'd /dev/r**** which
> was the character special file (raw volume). The other, matching /dev/
> entries are there, but that one is gone. Any way to recreate it? I've
> never had to create just the character file, usually a whole LV which
> makes it automagically.
>

So he just remvoe ONE entry and not executed /dev/r****.

Solution
Get the major and minor number of the device
Example: ( /dev/rsuselv ) was deleted
$ ls -l /dev/*suse*
# crw-rw---- 1 root system 10, 20 Jul 06 15:28 /dev/rsuselv
brw-rw---- 1 root system 10, 20 Aug 16 13:45 /dev/suselv

Recreate device ( man mknod Name { b | c } Major Minor )
$ mknod /dev/rsuselv c 10 20

hth
Hajo

#4 (**permalink**) 01-05-2008, 07:42 AM

Hrmm, something similar leapt to mind here, as well.

#5 (**permalink**) 01-05-2008, 07:42 AM

"John Hillman" <john.hillman@gmail.com> writes:
>Our Oracle DBA is doing some DR testing and has rm'd /dev/r**** which
>was the character special file (raw volume). The other, matching /dev/
>entries are there, but that one is gone. Any way to recreate it? I've
>never had to create just the character file, usually a whole LV which
>makes it automagically.

man mknod can help if you can find out the major and minor device
numbers...

-Mike

#6 (**permalink**) 01-05-2008, 07:43 AM

synclvodm vgname

can be run live -- 0 downtime involved.

#7 (**permalink**) 01-05-2008, 07:43 AM

That command has saved my job twice! 

We were doing migrations....nuff said.

--flossy

jthomp1515@yahoo.com wrote:

synclvodm vgname can be run live -- 0 downtime involved.

#8 (**permalink**) 01-05-2008, 07:43 AM

I'd say it's time to fire that DBA.

John Hillman wrote:
> Our Oracle DBA is doing some DR testing and has rm'd /dev/r**** which
> was the character special file (raw volume). The other, matching /dev/
> entries are there, but that one is gone. Any way to recreate it? I've
> never had to create just the character file, usually a whole LV which
> makes it automagically.
>
> TIA.

#9 (**permalink**) 01-05-2008, 07:43 AM

That was what I was looking for. Had a serious blank...mkdev, mklv,
mk???? Thanks!

#10 (**permalink**) 01-05-2008, 07:43 AM

Dave wrote:
> I'd say it's time to fire that DBA.
>
>
> John Hillman wrote:
>
>>Our Oracle DBA is doing some DR testing and has rm'd /dev/r**** which
>>was the character special file (raw volume). The other, matching /dev/
>>entries are there, but that one is gone. Any way to recreate it? I've
>>never had to create just the character file, usually a whole LV which
>>makes it automagically.
>>
>>TIA.
>
>

I'd certainly hope that the DBA in question did this testing on a test
box and didn't try it with a db that mattered.

--
Coy Hile
hile@cse.psu.edu

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Recreating /dev character special file?