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Re: Qlogic FC Multipath and engenio

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 <andrew@2sheds.de> 02/01/06 4:40 am >>>
I have gotten a little further in my config, and discovered that the 
StorageTek/ Engenio
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 
>little trouble
>configuring them to run correctly.

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