On Tue, 15 May 2007, ledouxe wrote:
Hi,
A client of mine has come upon what seems to be the limit of mailboxes for
one letter. They use student numbers for mailbox names. When a mailbox is
numerical, Cyrus puts the mailboxes under the letter "q" in /var/spool/imap
(ex: /var/spool/imap/q/user/12345/ )
My client can't create any more mailboxes (he has around 40 000). If he
deletes one, he can create one but can't create any more. But he can create a
new mailbox named "foo" for example. Just no more numerical mailboxes.
Has he reached Cyrus' maximum for one letter? Am I looking in the right
place?
More likely you've reached a limit in the number of entries you can have
in a single directory - a filesystem limitation.
The basic hashing method for Cyrus directories places all numerical
usernames in 'q' (as you found out). You might look into the fulldirhash
method instead. I'm not good enough with my perl to understand what this
code actually does:
$n = 0;
foreach my $b (split(/ */, $name)) {
$n = (($n << 3) ^ ($n >> 5)) ^ ord($b);
}
$h = chr(ord('A') + ($n % 23));
return $h;
but that is the method it uses for fulldirhash. :) It *will* spread the
numeric usernames around.
Make sure you read the docs on converting from basic to full hashing,
since it requires some offline time for Cyrus.
Andy
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