specs & platform for new server

Denis Beauchemin Denis.Beauchemin at USHERBROOKE.CA
Fri Nov 19 14:46:10 GMT 2004

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Sylvain Phaneuf wrote:

>I see your point and I don't mind the server being very busy. The only
>problem is that we have left the default setting "reject MTA connections
>when load is >12". So when our ISP realises that we don't accept their
>messages, our messages are put on their "wait 15 min" queue. Should I
>change the setting to much bigger nmbers?

I run with the following sendmail setup:
define(`confDELAY_LA', `8')dnl
define(`confQUEUE_LA', `18')dnl
define(`confREFUSE_LA', `12')dnl

This makes my server delay connections when the load is above 8.  It 
then almost never get over 12, when I stop accepting new connections.  
If that happens I hope the remote mailer is smart enough to go to my 
second MS host (same MX weight).

One small log excerpt:
Nov 18 10:50:43 sendmail[5539]: iAIFoh6C005539: 
delaying=EHLO, load average=11 >= 8
Nov 18 10:50:44 sendmail[4075]: iAIFoSiZ004075: 
delaying=RCPT, load average=12 >= 8
Nov 18 10:50:44 sendmail[20150]: rejecting connections on 
daemon MTA: load average: 12

In yesterday's log I counted 616 delay messages and only 10 reject ones.

PS: Those 2 servers are for internal University emails. They are P3 
1.2GHz with 768MB/1GB RAM.  They run 3 MS children each. Each box 
process around 10K messages/day (for 30K recipients) for 1GB data (up to 
5-10GB). Batch size is small, except when many messages come at the same 
time (such as a mass-mailing to all University employees). During day 
time, load average is somewhat below 3.  My MS-MRTG graphs say it 
averages at 1.0/1.3 in the daily graph. On occasions their in queue may 
grow up to 1000 but it clears quite rapidly.

  °v°   Denis Beauchemin, analyste
 /(_)\  Université de Sherbrooke, S.T.I.
  ^ ^   T: 819.821.8000x2252 F: 819.821.8045

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