Hmm, if i recall correctly Solaris saves a certain amount of the root filesystem (and possibly other filesystems) for the root-user, this is made in order to prevent normal users from filling up important filesystems.
I suspect that the root-user still can write to the filesystem, but non-root users cant, right?
I think you can change this behaviour via the 'tunefs' command.
(You can tune a filesystem, but you can't tune a fish).
.7/M.