Hi,
The load reaches 20, which is not that far from your MAX_DAEMON_CHILDREN directive in sendmail. You should try to find why the delivery processes are so slow to accomplish. Maybe it's a I/O backend problem. (I have experienced the same kind of problems with drbd writing, and slow hard disks)
For example, during a mailling delivery, check the wait (wa) state of your cpu with the command 'vmstat 1'. A high value reflect the cpu time spent in waiting for I/O.
Hope this helps, sam
Jon Blazquez a écrit :
Thank you for your response, With sendmail we have achieved to limit the load :
define(
confMAX_DAEMON_CHILDREN',15') define(confCONNECTION_RATE_THROTTLE',2')dnl define(confQUEUE_LA',5')dnl define(confREFUSE_LA',4')dnlWith this configuration the LOAD only reaches 20 ;-) but it’s not the solution. The cluster is formed by 3 nodes. The load balancer sends mails to a node, when it's full (LOAD 4-5) it denies receiving more mails so the load balancer sends them to the following node in the cluster and so on... In the first node the load continues increasing until it reaches roughly 20, then it falls down.
This is a temporary solution but we don’t know where exactly the problem is: dovecot’s deliver, ocfs2…. Any help would be appreciated,
Jon
Tomi Hakala escribió:
Jon Blazquez wrote:
The system works fine but when there are mailing lists the load increases dramatically.
Any suggestions?
First thing that I would do is to reduce number of concurrent deliver processes. I have no clue how this is done with Sendmail but with Postfix one could adjust deliver process "maxproc" value in master.cf.
Tomi