Why doesn HP-UX recognize long filenames?
In order for HP-UX to recognize RockRidge extensions, you need to mount the CD using the pfs_mount command instead of mount_cdfs. pfs_mount is licensed from Young Minds, Inc. and included for free in all HP-UX versions from 10.0 and above. If you are using automounter, you cannot set it up to automount RockRidge (as of version 11.0). Later versions of HP-UX may let you do this or have RockRidge built into cdfs.