Windows Server 2008 R2 sees lun twice... Host utils are installed!

[oweinmann]

Hi,

We have a very strange problem here.

Server 2008 R2 1 Qlogic HBA FC hostutils 5.3 installed. Connected luns are shown twice. I remeber that this was a problem if hostutils are not installed. But even with hostutils installed the luns are shown twice. This server only has one connection to the fc fabric.

Any suggestions?

Regards,

Oliver

[ken_foster]

you are having a multipathing issue.  you probably have an  HA pair, running in single image.  without MPIO configured you will always see multiple copies of your LUNs.

[oweinmann]

This is the only server in our environment where we have this issue. I remember we had this once on a windows 2003 machine where snap drive wasn't installed. The installation of snap drive solved this issue. I have a virtual 2008 server FC Host utils installed snap drive installed I see the lun only once. The same setup on the physical machine shows the lun twice.

[oweinmann]

Problem Solved.

I installed the Windows MPIO Feature, restarted the machine and reconnected the lun.

I don't know why this worked. On the VM there is no Microsoft MPIO feature installed and it works out of the box.

Cheers,

Oliver

[ken_foster]

i think i have an idea why the VM didn't have a problem.

The VM is probably accessing VIA iSCSI.  the other machine is probably accessing VIA FCP.  with FCP the VTIC is a valid path  with iSCSI it isn't.  Again, this is all supposition since i don't have a diagram but thats how it played out in my head.