Indeed in our test lab I've used the Qlogic card with the QLogic driver, 
which is what ADIC recommend.  No issues at all but I don't have enough 
hardware to test SSO intensively.    The latest Qlogic driver is 
dynamically reconfigurable - it says - as long as you use their tools to 
do so, and apparently you can *either* use the tools *or* edit the 
qla2300.conf file but not both.

The reason we use the qlc driver is the the ability to add LUNs without a 
reboot - i.e. we don't have to work through getting business approval when 
we need extra LUNs to expand a VxVM volume.  That is important.

I note now that the is a Sun-branded Emulex HBA (and now support for 
non-OEM Emulex cards), under the Sun SAN package - uses the Leadville 
stack but a different driver underneath.  It does allow access to the 
driver configuration (like ADISC) but should use cfgadm to manage it.  May 
be a good solution but I hate 'new' things.

So in summary if you are not using the Sun HBAs for disk, editing the 
driver-aliases to allow it to load the qla2300 driver may be good for 
tapes.  If you are using qlc for disks and need that no-reboot function it 
is not so easy.  It does work, I just reckon it is fragile and in our case 
lacks vendor support  - which I will have to do something about.

William D L Brown