IO error issues with MD3000i on Linux

[Matthew Geier]

Morten W. Petersen wrote:
>
> One interesting thing;  I got an IO Error message when using the first 
> controller,
> but not on the second!

 The controllers are not active-active like the more expensive (i.e. 
EMC) arrays.

 You will get an I/O error if you try to access a LUN via the standby 
controller - it can't access the storage unless the 'owner' controller 
fails or some other deliberate action taken.
 I spent hours trying to get multipath to work with out filling my 
console with I/O errors.
 The Multipath rdac driver in RHEL 5 doesn't actually know about the 
Dell/LSI 'rdac' MD3000i, and the basic 'readsector' path checker returns 
I/O error each time it tries to 'check the path' to the standby controller.