MSA 1000 Mounting Problem on Linux

[sdab]

Helo people!
I have a HP Proliant dlg 580, with a 4GB HBA 8002 Emulex.
I´ve installed debian etch on my server, and created 2 luns (in my another proliant with windows 2003).
These 2 luns are visible in my linux, its created /dev/sda and /dev/sdb for the luns.

But when a try to mount anyone of the luns, i get a error saying that device is already mounted, or the local to mount it is busy.
And the ACU utility is not working in this server, but the server found the luns and the MSA 1000 controller.
Any Ideas?
Thanks!