[ILUG] How do I map fibre channel to absolute /dev/sgxx

[Patrick Tuite]

On Monday 13 November 2006 18:28, Jeroen Massar wrote:
> Patrick Tuite wrote:
> > Hi all
> >
> > I had a bit of a problem with a fibre channel tape library. We recently
> > moved a bunch of systems, some connected to a fibre channel switch with
> > the tape library & storage arrays and discovered when running scripts for
> > Amanda that the tape library media changer, previous mapped to /dev/sg6,
> > had changed to /dev/sg1. All the cabling was marked and reassembled
> > identically.
> >
> > I was wondering if anyone knew a quick way to map the SCSI ID for a
> > device to a particular block device id when the system boots to avoid
> > having to edit the scripts each time it may change if the systems are
> > ever restarted?
>
> On anything with udev support you should be able to find them inside:
>  /dev/disk/by-id/
>  /dev/disk/by-path/
>  /dev/disk/by-uuid/
>
Doesn't appear to be installed with this version of RHEL3, but I can see how 
it would help.
Thank anyway.

> Depending what is the most convenient labeling mechanism for your needs.
> by-path is most likely the one you want in this case.
>
> Gives you for instance:
>
> /dev/disk/by-path$ ls -la
> lrwxrwxrwx 1 root root   9 Jul 27 16:05 pci-0000:02:04.0-scsi-0:0:1:0 ->
> ../../sda
>
> Greets,
>  Jeroen
>
>
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-- 
Patrick Tuite
Research IT Support
UCD IT Services
Ext: 2037