[OpenAFS] cyrus with storage in afs?

[Adam Megacz]

Hello, all.

We (hcoop.net) currently have Courier working using Maildirs stored in
afs (OpenAFS client, OpenAFS server).  It's working quite well, except
for the fact that courier's authentication mechanism is extremely
kludgey and required a good bit of hacking in order to make it utilize
pam_afs_session properly.  Even so, our final solution relies on
non-PAG-based (ie UID-based) token management, which is something I do
not like relying on.

We're looking at possibly moving to cyrus if we can have it use AFS
for storage.  The Cyrus FAQ, however, says:

  > Cyrus was designed to use a local filesystem with Unix semantics
  > and a working mmap()/write() combination. AFS doesn't provide
  > these semantics so won't work correctly.

  http://www.ibr.cs.tu-bs.de/cgi-bin/dwww?type=file&location=/usr/share/doc/cyrus21-doc/html/faq.html

Is this still the case, or does this refer to problems specific to
older versions of Transarc/OpenAFS?  If not, could anybody point me to
more detail on how interleaved mmap() and write() have different
semantics on AFS than they do on most other filesystems?

Thanks much,

  - a

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