[Stgt-devel] Some general questions about tgt

[Erez Zilber]

Robin Humble wrote:

> On Thu, Jan 03, 2008 at 11:55:04AM +0200, Erez Zilber wrote:
>   
>>   3. If the same lun is connected with 2 FC cables, you'll see that
>>      device twice. Is there any mechanism for preferred path? If not,
>>      is there any plan to do that in the near future?
>>     
>
> under tgt with dm-multipath across FC targets, or over tgt with
> dm-multipath across iSCSI/iSER targets would suffice?
>
> I think dm-multipath has preferred paths - maybe with prio_callout's.
>   

We've used dm-multipath only on the initiator side so far, so I just
want to make sure: usually, when I add a device to a target (using
tgtadm), I use something like /dev/sdX. Can I do something like the
following?

tgtadm --lld iscsi --op new --mode logicalunit --tid 1 --lun 1 -b /dev/dm0


If it's ok and you can also set a preferred path, this could be good enough.

Another question - did you actually try to run tgt with dm devices? Did
you face any problems?

Thanks,
Erez