"Create" in frontend: "Unknown/invalid partition"

[Alexey Lobanov]

Hello all.

I am building a Cyrus IMAP cluster for corporate use and the only
problem now is "Create" command.

In accordance with the manuals, a frontend should redirect "Create" to
the appropriate backend, and after that the backend propagates changed
list through mupdate.

In my system any "Create" at any frontend is cancelled instantly with
"NO Unknown/invalid partition".

"Rename" works fine both at frontends and at backends, and changes are
propagated properly in whole cluster. All regular mail access operations
work fine.

The server roles are: one is master+frontend, two are pure backends
(just old production servers), one is frontend+backend. The mentioned
behavior is seen in both frontends.

Cyrus version is 2.3.9, "imapd-disable-referrals" patch does not affect
anything. The clients are Cyradm and Thunderbird.

Any ideas for tests are highly appreciated. Both frontend Cyrus
instances are not in production use and can be tweaked freely.

Alexey