You must use the correct HBA device driver and firmware levels for the Apple hosts that are running on the Mac OS X server v10.5.x operating system.
The following IBM website provides current interoperability information about supported device driver and firmware levels:
http://support.lenovo.com/us/en/products/servers/lenovo-storage
For more information about ATTO HBA, device driver, and firmware downloads, go to the following website:
http://attotech.com/solutions/IBM/
After you log in to the support pages, select Celerity xxx for IBM SAN Volume Controller, where xxx is your HBA type.