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

[Conor Wynne]

Its most likely that you do not have persistent bindings set.
This is needed for tape libraries under fibre channel. AFAIR anyway.


On 13/11/2006 18:28, "Jeroen Massar" <jeroen at unfix.org> 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/
> 
> 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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