More than 32000 users

[Maykel Moya <moya@infomed.sld.cu>]

Our mail system live in a host (an old rh72 one). All accounts are
local, and the mailboxes are the /home/<username> directories.

We have reached the magic number 32000 (I learn today it's magic) and
I cannot create another /home/<username> because of 'Too many links'.

We are preparing to migrate the current setup to a shared storage with
OCFS2. Albeit the migration will take its time, I tested OCFS2 and
cannot create another directory beyond the 32000th, so, the migration
will not solve the a-lot-of-users-requesting-accounts requirement.

So, I'd been thinking in use some type of indexing, for example,
moya@domain.com will live in /srv/vmail/domain.com/m/o/moya

Would like you to share solutions, advises, tips, or whatever. The
priority is now to have a workaround for the limit in the current
host.

Saludos
maykel