It indeed appears to be a lower level problem. I rebooted both primary
server and storage nodes and cycled the power on the library. I can
label the same tape in devices 2-4 (/dev/nst2-4) but not device 1
(/dev/nst0). Next, I manually loaded the tape into drive 1 using 'nsrjb
-ln'. All fine. I then tried to tar some data to the tape and received a
similar message from the OS that the device is read-only, permission
denied, and I was root! I was able, however, to tar data to this tape
using devices 2-4. I was able to read the data on drive 1 that I tarred
from the other devices so I know the OS is fine for reading from it.
I checked the permissions on the devices: /dev/nst* and all have the
same permissions (crw-rw----), owner and group. Furthermore, the dates
are all the same and all from April 2002. I can't figure out why the OS
set this device read-only and how or where it's set!
Any thoughts?
George
Byron Servies wrote:
>
> On Jul 28, 2004, at 7:56 AM, George Sinclair wrote:
>
> > Hi,
> >
> > I enabled a previously disabled device last night. This is a Seagate
> > LTO
> > gen. 1 drive. There are 4 drives (/dev/nst0-4) in this Storagetek L80.
> > Anyway, I come in this morning to discover that NetWorker apparently
> > thinks /dev/nst0 is a read-only device. There were a lot of messages in
> > the log file indicating that /dev/nst0 is a read-only file system, so
> > it
> > was unable to write to any tapes using that device. I checked the
> > device
> > configuration under nwadmin, and it was 'Enabled' and 'Read only' was
> > set to 'no'. Not sure about 'Write enabled' since that's listed under
> > details so may not have set that last night before going home. Anyway,
> > I
> > set it to 'Yes' this morning, but as soon as I tried to label a tape in
> > that drive, same error:
> >
> > Wed 10:34:26 AM rd=snode:/dev/nst0 Label without mount operation in
> > progress
> > Wed 10:34:28 AM media warning: rd=snode:/dev/nst0 opening: Read-only
> > file system
> > Wed 10:35:28 AM rd=snode:/dev/nst0 write open error, Read-only file
> > system
>
> Because that is the error it received from the operating system when it
> tried to open the tape device. The string 'Read-only file system'
> probably also came from libc, not NetWorker.
>
> As previously mentioned, the tape might be write protected, or the
> permissions on the tape device might have been changed (ls -l /dev/nst0
> to check).
>
> Byron
>
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