- efs (SGI) - Transarc AFS supported efs, but [[OpenAFS]] doesn't have a license to use the efs code
- zfs (Solaris, FreeBSD, other ports) - you can however use a zvolume with a ufs or other supported filesystem
-The OpenAFS cache manager will detect an unsupported filesystem and refuse to start.
+On certain OSes, the OpenAFS cache manager has some checks for unsupported filesystem types and will refuse to start, but these checks are not 100% reliable.
The following file systems have been reported to work for the AFS client cache: