IO error issues with MD3000i on Linux

[Shyam_Iyer at Dell.com]

> -----Original Message-----
> From: linux-poweredge-bounces at lists.us.dell.com [mailto:linux-
> poweredge-bounces at lists.us.dell.com] On Behalf Of Matthew Geier
> Sent: Monday, June 15, 2009 4:51 AM
> To: Morten W. Petersen
> Cc: linux-poweredge-Lists
> Subject: Re: IO error issues with MD3000i on Linux
> 
> 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.

https://bugzilla.redhat.com/show_bug.cgi?id=487293 should have some new
kernels that provide MD3000i support.