Re: [dm-devel] multipathd: sdc: readsector0 checker reports path is down

[Ray Van Dolson <rvandolson esri com>]

On Thu, Jan 08, 2009 at 11:56:43AM -0800, Konrad Rzeszutek wrote:
> 
> On Thu, Jan 08, 2009 at 11:31:38AM -0800, Ray Van Dolson wrote:
> > I'm still getting the hang of iSCSI and multipath, so bear with me if
> > this is a FAQ that I've missed...
> > 
> > I have a host attaching to an MD3000i via iSCSI/dm-multipath that is
> > working but showing a lot of the following errors in syslog:
> > 
> >   multipathd: sdc: readsector0 checker reports path is down
> 
> You are using the wrong path checker, wrong path priority program,
> and no hardware path checker :-(
> 
> Here is what you need in your multipath.conf file:
> 
>  #   
>     # DELL :D3000i :: Active-Passive RDAC
>     # Note: The same as the IBM DS3300
>     #   
>     device {
>         vendor          "DELL"
>         product         "MD3000i"
>         product_blacklist   "Universal Xport"
>         features        "1 queue_if_no_path"
>         path_grouping_policy    group_by_prio
>         hardware_handler    "1 rdac"
>         path_checker        rdac
>         prio            "rdac"
>         failback        immediate
>     }   
> 
> 
> Thought you might need to replace the 'prio	"rdac"' with
> 'prio_callout	"/sbin/mpath_prio_rdac" as I think RHEL5/CentOS5 uses
> the old calling convention.
> 
> This should get rid of your down errors and show your passive/active path
> properly.

Thanks.  I had to remove the features line -- got an Unrecognised
feature request error otherwise.

Thanks again,
Ray