inconsistent performance

[Dave Jones]

>Could be I guess, netstat just shows up the usual mass of smtp
>connections - it's just really odd why it's ok on the most part but as
>soon as somthing triggers a choke they all start backing the queue up
>with messages.
>
>I'll do some more checking around.
>
>thanks Richard
>
>SMJ
>
>2008/7/7 Richard Frovarp <richard.frovarp at sendit.nodak.edu>:
>> Simon Jones wrote:
>>>
>>> hello chaps,
>>>
>>> anyone have an idea why i'm seeing inconsistent performance on all 3
>>> of my gateway servers?  Nothing shows up errors in the maillog and
>>> MailScanner --Lint checks out ok but from time to time the machines
>>> will choke and i'll stack 2k and rising messages up in the hold queue.
>>>
>>> one day they'll work fine and the hold queue will be normal, then all
>>> of a sudden they'll start backing up.
>>>
>>> I have postfix reading from mysql for the relay_domains /
>>> relay_recipients and transport maps as well as logging to a seperate
>>> db on the same seperate db server for mailwatch.
>>>
>>> the mysql db has dual oppy's with 10gb ram so it's pretty beefy and
>>> doesn't seem to be maxed at all.
>>>
>>> the gateways run fairly heavy but are by no means topping out.  I've
>>> tried dropping max children and the batch processing settings but to
>>> no avail.
>>>
>>> any ideas would be really appreciated.
>>>
>>> thanks
>>>
>>> SMJ
>>>
>>
>> What about mail volume? Is it consistent across the days in question? Or,
>> even if the numbers are the same, you might end up with bursty traffic on
>> the days you backup, causing everything to fall behind. Botnets, mailing
>> lists, all of that sort can drop traffic on you in one heck of a hurry at
>> times.
> --

You might want to put Munin on the boxes to quickly get some high-level
charts across all 3 boxes to see trending over time.  We have Munin local to
each box so we can check general performance info when something like this
comes up.

-- 
Dave Jones
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