Networker

Re: [Networker] Linux Tape Drive Re-Ordering Issue

2010-11-03 16:27:35
Subject: Re: [Networker] Linux Tape Drive Re-Ordering Issue
From: Brian Narkinsky <bnarkinsky AT GMAIL DOT COM>
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Date: Wed, 3 Nov 2010 16:26:28 -0400
I had the same thing with an ESN.  I know that UDEV has be a certain level
for persistent binding to work.  The version I upgraded to was SLES 9 udev
-021-36.69.i586.rpm.

Brian

On Wed, Nov 3, 2010 at 4:17 PM, Mark Leese <mark.r.leese AT gmail DOT com> 
wrote:

> Hi Raymond,
>
> It is indeed an issue with the udev environment within Linux, I had a
> similar problem with some EMC EDL/CDL boxes. These have an Embedded Storage
> Node facility that run Linux. On a customer that I have been working at we
> recently upgraded the firmware and as a matter of course the Linux
> installation and we discovered a bug with the implementation of udev. Every
> reboot, even when using persistent binding (/dev/tape/by-id/xxxxxxx-nst)
> would have problems, once we added the udev patches everything worked fine.
>
> I don't have a link to the exact problem however there is a solution on
> powerlink that goes into to the problem. Incidentally the flavour of Linux
> was SuSE/Novell, so the tech support section on their website may also
> provide information to help resolve your issue.
>
> Thanks,
>
> Mark.
>
> On 3 November 2010 19:07, Davis, Raymond P <
>  Raymond.P.Davis AT questdiagnostics DOT com> wrote:
>
> >
> >  Hi,
> >
> >  We have a Quantum LTO Tape library with a bunch of drives. Our Linux
> > networker server sees one of the partitions. We have just finally
> > implemented persistent binding on the Linux host and things are working
> > better. Before that, we needed to reconfigure the tape library with
> > every Linux reboot. The next issue seems to be when a tape drive goes
> > awry, it loses its drive mapping and issues a SCSI reset, which in turn
> > reorders the tape drives dynamically. Has anyone else had this
> > experience and are there any ideas as to how to circumvent this problem.
> >
> >
> > I have reached out internally to my Linux group who are looking into it.
> > I asked Quantum and they know about it but don't have any solution for
> > me as of yet. Finally, EMC says it's a Linux issue and not specific to
> > networker. BTW, when this happens, we wind up needing to bring down 3
> > separate netwoker environments and 3 library partitions, hard booting
> > the library and rebooting the Linux networker server/ storage node.
> >
> > Thanks for any help.
> >
> >
> > Raymond Davis
> >
> > Quest Diagnostics | Sr. Storage Engineer | 1200 Wall St West |
> > Lyndhurst, NJ 07071  USA | phone +1.201.729.7882 |  mobile
> > +1.201.841.2335 | Raymond.P.Davis AT QuestDiagnostics DOT com |
> > www.QuestDiagnostics.com <http://www.questdiagnostics.com/>
> >
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