lmtpd processes 'hanging'

[gavin.gray at ed.ac.uk]

Hi there
        We are runnning cyrus 2.3.15 in a murder set up. We have recently 
started having intermittent problems with mail delivery to the backends.

Every so often the lmtpd processes on each of the backends stop doing 
anything and a mail queue begins to build up on out lmtp server. After 
around five minutes or so everything bursts back into life with the lmtpd 
processes on the backends and the queue on the lmtp server drains.

We can't figure out why this is happening.

If anyone has any ideas they would be greatly appreciated

During working hours we usually have around 3000 imapd processes per 
backend and normally deliver a few hundred messages per minute.

We have three identical backend servers. One of them has become buisier in 
terms of active users ie larger mail store, larger deliverdb. We use 
berkley db for the cyrus databases.

regards,


Gavin Gray
Edinburgh University Information Services
Rm 2013 JCMB
Kings Buildings
Edinburgh
EH9 3JZ
UK
tel +44 (0)131 650 5987
email gavin.gray at ed.ac.uk

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