Mailbox hierarchy determination?

[Patrick Goetz]

On 3/14/19 3:50 AM, Simon Matter wrote:
> 
> Dirhashing is controlled by "fulldirhash" and "hashimapspool".
> 


Right.  This is what it says in imapd.conf:

----
        fulldirhash: 0
   If enabled, uses an improved directory hashing scheme which hashes on
the entire username instead of using just the first letter as the hash. 
This changes hash algorithm used for quota and user directories and if 
hashimapspool is enabled, the entire mail spool.

    Note that this option CANNOT be changed on a live system. The server
must be quiesced and then the directories moved with the rehash utility.

        hashimapspool: 0
  If enabled, the partitions will also be hashed, in addition to the
hashing done on configuration directories. This is recommended if one 
partition has a very bushy mailbox tree.
----

I don't have these options enabled, and my interpretation of this 
description is that enabling them would facilitate my configuration, not 
the other way around.  This is what confused me in the first place.

What am I missing?