You will see at least 2 devices for every one drive depending on your san configuration. Multipath tools or mdadm can combine these to make one multipath device. The qlogic driver will do this for you as well. From what I have seen if you want support from the storage company you should connect the way they specify in their docs.
>>>Andrew Miehs <firstname.lastname@example.org> 02/01/06 4:40 am >>>
I have gotten a little further in my config, and discovered that the
system seems to do something really strange - I don't know if this is
really standard behaviour....
If I set up two luns on the raid system, one is attached to
controller A, the second to controller B
on the StorageTek D240.
With D240-ControllerA, D240-ControllerB and Linux-HBA-port1 connected
to one switch, I see 4 LUNs.
They get assigned to sdc, sdd, sde, sdf. Only two of these work
/dev/sdc1 1 34220 35041264 8e Linux LVM
end_request: I/O error, dev sdd, sector 0
/dev/sde1 1 34220 35041264 8e Linux LVM
end_request: I/O error, dev sdf, sector 0
Where sdc and sdd seem to be the same disk, and sde and sdf seem to
be the same disk....
It seems that the RDAC driver that Engenio delivers is designed to
deal with this problem...
Or have I misunderstood something? Is there a better way?
Is anyone using an Engenio based storage device without the RDAC
Thanks for you help,
On Jan 31, 2006, at 7:57 PM, Andrew Miehs wrote:
>I have recently bought my first set of FC devices, and am having a
>configuring them to run correctly.
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