2010-12-29 07:37 AM
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.
2010-12-29 10:43 AM
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.
2010-12-30 12:27 AM
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.
2010-12-30 12:54 AM
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.
2010-12-30 06:06 AM
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.