Re: [dm-devel] multipath - AAArgh! How do I turn "features=1 queue_if_no_path" off?

[Hannes Reinecke <hare suse de>]

malahal us ibm com wrote:
> John Hughes [john Calva COM] wrote:
> > I want to turn queue_if_no_path off and use
> >
> >                polling_interval        5
> >                no_path_retry           5
> >
> > because I've had problems with things hanging when a lun "vanishes" (I 
> > deleted it from my external raid box).
> >
> > But whatever I put in /etc/multipath.conf when I do a "multipath -l" or 
> > "multipath-ll" it shows:
>
> Did you reload the mapper table?
>
> > 360024e80005b3add000001b64ab05c87dm-28 DELL    ,MD3000        
> > [size=68G][features=1 queue_if_no_path][hwhandler=1 rdac]
> > \_ round-robin 0 [prio=3][active]
> > \_ 3:0:1:13 sdad 65:208 [active][ready]
> > \_ round-robin 0 [prio=0][enabled]
> > \_ 4:0:0:13 sdas 66:192 [active][ghost]
Which is entirely correct. The 'queue_if_no_path' flag _has_ to
be set here as we do want to retry failed paths, if only for
a limited amount of retries.

The in-kernel dm-multipath module should handle the situation correctly
and switch off the queue_if_no_path flag (= pass I/O errors upwards)
when the amount of retries is exhausted.

You can only switch the flag off by setting 'no_path_retry failed'.

Cheers,

Hannes
--
Dr. Hannes Reinecke		      zSeries & Storage
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