[dm-devel] Round Robin vs Active/Passive

[Tore Anderson]

* Craig Simpson

> All is Beautiful now. Not logging any errors to messages so looks like "
> mpath_prio_hds_modular" is getting called correctly. 
> 
> Multipath -ll
> asm14 (1HITACHI_730600240013) dm-55 HITACHI,DF600F
> [size=64G][features=0][hwhandler=0]
> \_ round-robin 0 [prio=2][active]
>  \_ 1:0:0:13 sdcp 69:208  [active][ready]
>  \_ 0:0:0:13 sdn  8:208   [active][ready]
> \_ round-robin 0 [prio=0][enabled]
>  \_ 0:0:1:13 sdbb 67:80   [active][ready]
>  \_ 1:0:1:13 sded 128:80  [active][ready]

Yes, you can see from this output that sdcp and sdn have a prio of 1,
placing them in the same priority group (which in sum have a prio of 2),
so the prio-callout definitely works as it is supposed to.  Everything
looks good, now you should try yanking some fibres (with lots of I/O
activity running) to make sure that it actually is able to handle a
failure scenario.  Good luck.

Regards,
-- 
Tore Anderson