If you install Xserve RAID Firmware version 1.3.1-1.24 that came with the Xserve RAID Admin 1.3.2 Update, LUN masking settings that were made using the RAID Admin application will not be properly set.
Symptom
If you use RAID Admin to specify LUN masking settings for your Xserve RAID, the settings will appear to be set properly in RAID Admin, but the LUN masking settings will not be enforced by the Xserve RAID. All hosts on the same Fibre Channel network as the Xserve RAID will be able to access all LUNs.
Solution
This issue has been addressed by RAID Admin 1.3.3 or later, and the accompanying firmware. The latest version of RAID Admin can be downloaded as a disk image, a tar file or a zip file from the Downloads area of the Apple Support site. Apple recommends that customers run the latest version of RAID Admin and the accompanying firmware with their Xserve RAID.