Mounting volumes read-only

Hi, Wondered if anyone could help me here. We need to mount a number of fibre channel RAID volumes read-only on a server and we're having a few problems. I seem to be able to happily ignore volumes, and prevent them from mounting using: - [code]UUID=A507B9D0-5A73-34EF-9569-DB93E7EBF7D6 none hfs ro,noauto[/code] and [code]LABEL=storarray01 none hfs ro,noauto[/code] But when I try to mount a volume read-only using: - [code]UUID=A507B9D0-5A73-34EF-9569-DB93E7EBF7D6 /Volumes/storarray01 hfs ro[/code] or [code]UUID=A507B9D0-5A73-34EF-9569-DB93E7EBF7D6 /Volumes/storarray01 hfs ro,auto[/code] it does not mount. The disk shows up in diskutil, showing the volume as unmounted, but I kind of expected it to mount without write privileges. Am I expecting the wrong behaviour, or have I got something wildly wrong? Something makes me think things are not working correctly as using the same commands for a Xyratex RAID volume causes it to not show up in diskutil at all where as the Apple RAID behaves as above. I have diskarbitrationd logs available if they are any help... Cheers Dan