we're currently on 6.7b-41. i guess we need to upgrade the code to get
erec_show. that's something i'm a bit reluctant to do right now :-)
advanced web systems
On 3/18/2016 4:12 PM, surgemail-support wrote:
> The primary thing to grab is
> tellmail status
> while the load is occurring, a couple of them would be good and send
> along for me to look at.
> The other command in recent builds that can be useful is:
> tellmail erec_show
> which gives some useful information on which imap users are causing
> the most 'load'. this can help to identify an account that is sending
> out thrashing
> imap commands (sometimes a bad client will just send the same request
> On 19/03/2016 8:37 a.m., David Camm wrote:
>> we're running on a 4-core, 4G, raid5 machine running open suse linux.
>> the kernel thinks we have 8 cores.
>> under most circumstances, surgemail just hums along with a load
>> average anywhere from .5 to 4, which is just fine.
>> several times lately, we've seen the load average spike to 10 or more
>> and remain there for several minutes, at which point i stop
>> surgemail, wait a bit and restart.
>> what we've determined is that there's a HUGE amount of io activity
>> occurring when this happens and the system becomes io-bound.
>> we've tried running iotop, but that only tells us surgemail is
>> writing a gazillion kb per second. not very helpful. examining the
>> logs hasn't proved to be useful either.
>> is there any diagnostic we can run to determine what's happening and
>> why there's such a huge io load?
>> and, can anyone give some insight as to what situation might cause
>> this to happen in the first place?
>> btw - we're very conservative and limit email size to 20MB, so it
>> can't be someone trying to receive a file with a 1GB attachment. it
>> also can't be hackers attempting to log in, as that would just
>> generate small writes to mail.err.
>> david camm
>> advanced web systems
>> keller, tx
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