dovecot - Oct 2011 - Question about ionice & dovecot-deliver

Hello

 We are running dovecot 2.0.13 with mdbox on RHEL 5.7 x64, ext4 filesystem.
Sometimes we have a big load increase because a mailing list server send 16.000
32k messages in less than 3 minutes. We want to "slow down" delivery,
we prefer slow delivery instead of logging out webmail users.

 I have  the following line en /etc/postfix/master.cf:

 flags=DRhu user=userid argv=/usr/libexec/dovecot/deliver -d ${user}

And in /etc/postfix/main.cf

 mailbox_command = /usr/libexec/dovecot/deliver

I would like to add ionice to the equation, prefixing /usr/bin/ionice -c2 -n6
before the deliver lines in postfix config. Is there any other way of slowing
down delivery speed vs imap access?

 Regards

 Maria

This sounds like a postfix issue more than dovecot.

Its easy to make a slow deliever transport for postfix, many people do  
so when sending emails to hotmail/yahoo.

Sounds like that solution would work for you, just applied to the  
dovecot transport instead.


Quoting Maria Arrea <maria_arrea at gmx.com>:
> Hello
>
>  We are running dovecot 2.0.13 with mdbox on RHEL 5.7 x64, ext4  
> filesystem. Sometimes we have a big load increase because a mailing  
> list server send 16.000 32k messages in less than 3 minutes. We want  
> to "slow down" delivery, we prefer slow delivery instead of
logging
> out webmail users.
>
>  I have  the following line en /etc/postfix/master.cf:
>
>  flags=DRhu user=userid argv=/usr/libexec/dovecot/deliver -d ${user}
>
> And in /etc/postfix/main.cf
>
>  mailbox_command = /usr/libexec/dovecot/deliver
>
> I would like to add ionice to the equation, prefixing  
> /usr/bin/ionice -c2 -n6 before the deliver lines in postfix config.  
> Is there any other way of slowing down delivery speed vs imap access?
>
>  Regards
>
>  Maria

On 10/15/2011 5:11 PM, Maria Arrea wrote:

<...>
> Is there any other way of slowing down delivery speed vs imap access?
The proper way to slow down inbound mail is with your MTA, not your LDA,
and certainly not using kernel level tweaks to the IO subsystem.  There
are many ways to accomplish this with Postfix.  Please post your
question on the Postfix mailing list.

Conversely, if you or your organization control that list server, simply
tweak the mailing list manager software, or the MTA, lowering the
delivery rate.

-- 
Stan