who has experiance with large number of mailboxes ?

[원태환]

Hi,
I am trying to make about 500,000 mailboxes in a single server, 
which has 4CPU and 1G RAM.
I am worry about disk access time in 
      (1) lookup up mailbox path from mailbox db.
      (2) directory navigation to select a specific message file.

I think I have to change the cyrus directory hashing mechnism to provide more deep
hierachical directory tree and two-characters hashing directory.

Any idea ?

Thanks in advance.

------------
Tawan Won