I have been having problems with resouce utilization with one of my qmail servers, which basically boils down to reaching the concurrencylimit of tcpserver for my pop3 connections (60) and this brings the server to its knees. The only recourse I have left is to reboot, since even console is not responsive.
I have checked my logs, and basically, for each pop3 connection, an instance of mysql is generated to check password for a virtual domain user, this generates swapping. The load average shoots up to 300 and I have seen this go as high as 500.
The server is running Linux RedHat 7.3 and has 512MB RAM and 1GB SWAP, for about 4000 users in 70 virtual domains. It also runs Apache for qmailadmin. Since there are not that many users per domain, less than 100 average, will CDB Files be a better solution to this problem?
Currently running vpopmail 5.3.19 and qmailadmin 1.0.15
-- Jorge Valdes IT Manager Intercom El Salvador [EMAIL PROTECTED]