<div class="gmail_quote">On Thu, Feb 5, 2009 at 8:29 PM, Chandra Seetharaman <<a href="mailto:sekharan@us.ibm.com">sekharan@us.ibm.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div class="Ih2E3d"> On Thu, 2009-02-05 at 19:48 +0100, Christian Røsnes wrote: > > Is mpp another type of rdac driver than the one in question here ? </div>Yes, MPP is a standalone out-of-tree driver provided by LSI to support the rdac devices. Now that rdac support is available in mainline and distro, you do not need to use them anymore. MPP driver sits below the SCSI layer and manages all the failover/failback. It takes the MD3000i devices and provides the "virtual disk" to the SCSI layer. That is the reason why you do not see the MD3000i from user space. Once you remove the mpp driver and use the multipathy.conf provided by Babu, you should see the behavior you expect. </blockquote></div> Ok. I will remove the mpp driver. Thank you Christian