dovecot - Nov 2009 - Dovecot Deliver CPU usage

Hi All, 

We have upgraded the dovecot from 1.0 to 1.2.8. After
upgradation we have noticed that dovecot deliver process is utilizing a lot
of CPU. As a result the mailsystem will stop working. When we limit the no
of procs in postfix for dovecot deliver the CPU usage will come down. But
we are not facing this problem with the previous version. Below is the log
files for dovecot when the error occurs


write_full(/home/vmail/dhanbank.co.in/vinukumarvm/temp.server.be3e5a849a909847)
failed: No space left on device
dovecot: deliver(user at example.com):
stat(/tmp/Dovecot Delivery Mail) failed: No space left on device 

But my
system has 54gb of free space for root filesystem where tmp residing. Can
anyone help me to solve this issue. 

Rgds,
Aravind

On 11/28/2009, Aravind Divakaran (aravind.divakaran at yukthi.com)
wrote:
>
write_full(/home/vmail/dhanbank.co.in/vinukumarvm/temp.server.be3e5a849a909847)
> failed: No space left on device
> dovecot: deliver(user at example.com):
> stat(/tmp/Dovecot Delivery Mail) failed: No space left on device 
> 
> But my
> system has 54gb of free space for root filesystem where tmp residing. Can
> anyone help me to solve this issue. 
Its not looking at / for the temp, it is using the users home directory,
according to the above...

Are you using quotas?

dovecot -n output?

On Sat, 28 Nov 2009 09:17:12 -0500, Charles Marcus
<CMarcus at Media-Brokers.com> wrote:
> On 11/28/2009, Aravind Divakaran (aravind.divakaran at yukthi.com) wrote:
>>
write_full(/home/vmail/dhanbank.co.in/vinukumarvm/temp.server.be3e5a849a909847)
>> failed: No space left on device
>> dovecot: deliver(user at example.com):
>> stat(/tmp/Dovecot Delivery Mail) failed: No space left on device 
>> 
>> But my
>> system has 54gb of free space for root filesystem where tmp residing.
Can
>> anyone help me to solve this issue. 
> 
> Its not looking at / for the temp, it is using the users home directory,
> according to the above...
> 
> Are you using quotas?
> 
> dovecot -n output?
Yes i am using quota, below is my configuration

# 1.2.8: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.30 x86_64 Debian 5.0 ocfs2
log_timestamp: %Y-%m-%d %H:%M:%S
protocols: imap imaps pop3 pop3s managesieve
disable_plaintext_auth: no
login_dir: /var/run/dovecot/login
login_executable(default): /usr/lib/dovecot/imap-login
login_executable(imap): /usr/lib/dovecot/imap-login
login_executable(pop3): /usr/lib/dovecot/pop3-login
login_executable(managesieve): /usr/lib/dovecot/managesieve-login
mail_privileged_group: mail
mail_uid: 1003
mail_gid: 1003
mail_location: maildir:/home/vmail/%d/%n
mbox_write_locks: fcntl dotlock
mail_executable(default): /usr/lib/dovecot/imap
mail_executable(pop3): /usr/lib/dovecot/pop3
mail_executable(managesieve): /usr/lib/dovecot/managesieve
mail_plugins(default): quota imap_quota acl listescape
mail_plugins(imap): quota imap_quota acl listescape
mail_plugins(pop3): quota
mail_plugins(managesieve):
mail_plugin_dir(default): /usr/lib/dovecot/modules/imap
mail_plugin_dir(imap): /usr/lib/dovecot/modules/imap
mail_plugin_dir(pop3): /usr/lib/dovecot/modules/pop3
mail_plugin_dir(managesieve): /usr/lib/dovecot/modules/managesieve
namespace:
  type: private
  separator: /
  inbox: yes
  list: yes
  subscriptions: yes
lda:
  postmaster_address: postmaster at example.com
  mail_plugins: quota sieve
auth default:
  mechanisms: login plain
  passdb:
    driver: ldap
    args: /etc/dovecot/dovecot-ldap.conf
  userdb:
    driver: ldap
    args: /etc/dovecot/dovecot-ldap.conf
  socket:
    type: listen
    client:
      path: /var/spool/postfix/private/auth
      mode: 432
      user: postfix
      group: postfix
    master:
      path: /var/run/dovecot/auth-master
      mode: 384
      user: vmail
plugin:
  quota: maildir:storage=250000
  sieve: /home/vmail/sieve/%d/%n/.dovecot.sieve
  sieve_storage: /home/vmail/sieve/%d/%n/sieve
  sieve_extensions: +imapflags
  acl: vfile:/etc/dovecot/acls

Users quota is getting from ldap.

-Aravind

On Nov 28, 2009, at 3:21 AM, Aravind Divakaran wrote:
> We have upgraded the dovecot from 1.0 to 1.2.8. After
> upgradation we have noticed that dovecot deliver process is utilizing a lot
> of CPU. As a result the mailsystem will stop working. When we limit the no
> of procs in postfix for dovecot deliver the CPU usage will come down. But
> we are not facing this problem with the previous version. Below is the log
> files for dovecot when the error occurs
You mean a single deliver process can run a long time with 100% CPU? Getting a
strace of the process could be helpful.
>
write_full(/home/vmail/dhanbank.co.in/vinukumarvm/temp.server.be3e5a849a909847)
> failed: No space left on device
> dovecot: deliver(user at example.com):
> stat(/tmp/Dovecot Delivery Mail) failed: No space left on device 
> 
> But my
> system has 54gb of free space for root filesystem where tmp residing. Can
> anyone help me to solve this issue. 
The /tmp/ part is wrong, I should get that fixed probably. Is there space in
/home/vmail? Or do you use filesystem quotas? (I see you're also using
Maildir++ quotas.)