Hi all.   Welcome to Monday :)

We have a v890 with a 2540 attached.  One controller goes into one qlc
FC card, and the other controller into the other FC card on the host. 

A volume has been created on the 2540 and mapped to the host.   All
was good.   However, while luxadm showed the one WWN with two paths
(/dev/dsk/c2t0d7s2 and /dev/dsk/c4t0d7s2) format showed two seperate
disks.

From my minimal understanding of the multipathing (enabled with
stmsboot -e) the system should be seeing this as one device node with
a long name for the uniqueness.   

Following a thread I found online (it must be true! :)  I added the
line
device-type-scsi-options-list ="SUN     LCSM100_F",
"symmetric-option";

to the scsi_vhci.conf file and rebooted.   This let the system
recognize the multiple paths and gave me one device name for it.

However, I can't do anything.   newfs returns a "i/o error".   prtvtoc
shows the correct partition table for the drive, with slice 6 being my
1.99TB space.  luxadm shows everything online and happy.

I have found this post here:
http://unix.derkeiler.com/Newsgroups/comp.unix.solaris/2008-01/msg00163.html

that talks about the 2540 not really acting like you'd think.  The
gist of it is that yes, it has two controllers, but for a LUN only one
is active for that LUN at a time.   So basically, trying to do
round-robin to acheive better performance doesn't work on this device.

Would that be the opinion of the group or am I missing something?

If that is the case, if I take the lines back out of scsi_vhci, would
I at least still get failover if one of the fibers were to go out?  Or
does it only failover if the controller dies?

thanks,
	-Dan