Yeah, it almost seems like some kind of hardware issue, like maybe
something internal to the drive that allows write access has been unset.
Not sure how, though. There are no power switches on the drives that I
can tell, only the buton to eject the tape and some leds. When I
manually load/unload a tape from this drive, the lights behave exactly
the same as on the other drives. The only power switches I see are on
the back of the unit. I power cycled the library, but maybe I need to
leave it off longer?
plangfor AT ab.bluecross DOT ca wrote:
>
> Could be a hardware issue. Have you cycled the power on the tape drive
> and/or jukebox, leaving it of for a couple of minutes?
>
> Paul
>
> -----Original Message-----
> From: George Sinclair [mailto:George.Sinclair AT NOAA DOT GOV]
> Sent: Wednesday, July 28, 2004 12:06 PM
> To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> Subject: Re: [Networker] Cannot write to tape drive -- read only file
> system?
>
> 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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