You have to dig through PowerLink a bit to find this but there is a pretty
good paper on how to configure Tape Drives in Networker.  Lot of good info
in here.

EMC® NetWorker®
Configuring Tape Devices for EMC NetWorker
Technical Note
P/N 300-008-352
REV A04

On Fri, Nov 5, 2010 at 9:24 AM, Francis Swasey <Frank.Swasey AT uvm DOT edu> 
wrote:

> Have you tested what happens when a tape drive fails and you have to
> replace it with a new one
> (which has a different serial number) doing it that way?
>
> For those of us that created our jukebox back in the 7.2 (or earlier) days
> and have the jukebox
> defined using the rd=<storagenode>:/dev/nstX devices, I strongly urge you
> to consider coercing
> udev into picking which /dev/nstX device the drive is based on the serial
> number (then
> remembering to update that rule when you replace a drive).
>
> I have set it up as /etc/udev/rules.d/20-local.rules -- which is a copy of
> the 50-udev.rules
> file with a line added for each tape drive like:
>
> KERNEL=="nst[0-9]*", SUBSYSTEM=="scsi_tape",
> ENV{ID_SERIAL}=="3500507631203e5d4", NAME="nst0",
> SYMLINK+="tape/by-id/$env{ID_BUS}-$env{ID_SERIAL}-nst", SYMLINK+="tape0"
>
> just in front of the
>
> KERNEL=="nst[0-9]*", SUBSYSTEM=="scsi_tape", ENV{ID_SERIAL}=="?*",
> SYMLINK+="tape/by-id/$env{ID_BUS}-$env{ID_SERIAL}-nst"
>
> line.
>
> Why would I do something this convoluted?  Because I don't like the risk of
> having to perform a
> 25 hour jukebox inventory just because a tape drive failed and suddenly I
> have to re-define the
> jukebox because EMC's code messed up and can't figure out what happened to
> that tape drive that
> broke and was removed.
>
> Frank
>
> On 11/5/10 8:43 AM, Riku Valli wrote:
> > Matthew Huff wrote:
> >> I'm not sure you understand persistent binding. With persistent binding,
> no changes
> >> (including SCSI bus resets) will change the names (and therefore the
> drive order).
> >>
> > Yes, tape drives uses serialnumbers for devicenames at RHEL 5 for
> persistent bindings. So them
> > cannot change.
> > /dev/tape/by-id/scsi-3500308c09fb49000-nst
> >
> > When you made jukebox, you should select use persistent names and NMC:s
> graphical gui uses
> > automatic this by-id name convention or manual with command jbconfig -p,
> but jbconfig is'nt
> > recommed to use at newer Networker versions.
>
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