[Dovecot] Errors on high load

[Jack Stewart]

Although my high load errors with different, the following might help. 
Once I did the following system tuning, the errors went away (including 
the infamous backtrace/maildir_transaction...). The following parameters 
were cranked up (for dovecot,system, & mail) :

   open files => 32768
   locks => 32768
   maxsyslogins => 16384
   maxlogins => 4096
   max_user_instances => 2048

In RHE, the first four are in limits.conf and the last is in 
/proc/sys/fs/inotify/max_user_instances. Probably all are not needed (in 
particular maxlogins) but open files definitely made a different - lsof 
was showing 24K files for dovecot & mail. My bottleneck was a piece of 
old network gear and once the traffic settled down open file dropped to 
4K (and load from 200 to 0.5)

These might not address your particular problem but system tuning could 
address the memory corruption error. These settings also got rid of my 
error messages under low load.

It is also probably worth while to shut the system down and run memory 
test (i.e. memtest86+ - or if it is under maintenance just get it replaced)

---Jack


Allan Cassaro wrote:
> On Tue, Sep 16, 2008 at 10:37 AM, Charles Marcus
> <CMarcus at media-brokers.com> wrote:
>> On 9/16/2008, Allan Cassaro (allan.cassaro at gmail.com) wrote:
>>> Hi, always when my server is on high load I saw this errors on logs:
>> doevecot -n output / version info?
> 
> Ouch!
> Sorry! I forgot this...
>