[Dovecot] dovecot & OCFS2 Cluster

[Henrique Fernandes]

There is a bug in ocfs2 1.4 if you are using it you should be looking for
upgrading to ocfs2 1.6

I have several performance problens with ocfs2 but now i guess the problem
is the webmail client that we are using.

I have several post here about it.

I will write a new one as soon as i found the solution.

Anyway, why use lmtp over lda ?

My setup have about 5000 active acounts all in maildir.

And i have never had you cpu problem.


[]'sf.rique


On Mon, Apr 25, 2011 at 3:53 PM, Robert Schetterer <robert at schetterer.org>wrote:

> Am 25.04.2011 19:02, schrieb Osvaldo Alvarez Pozo:
> > hi all
> >
> > We have an ocfs2 cluster compose of 4 Debian lenny serveurs wich have
> > access to an ISCSI LUN we have create a partition on this Lun and
> > formated this partition as OCFS2.
> > 2 serveurs does mail delivery (SMTP) and the two other are pop/imap
> > servers. The smtp servers use dovecot LDA to deliver to mailboxes. La
> > version de dovecot is 1.2.13, ldirectord balance conexion to the
> > servers(pop/pops/imap/imaps to the two imap/pop serveurs) (smtp to the
> > two smtp servers).
> >
> >
> > this is a part of my  dovecot.conf
> >
> > mail_location = maildir:/var/vmail/%d/%u/Maildir
> > mail_access_groups = mail
> > first_valid_uid = 5000
> > last_valid_uid = 5000
> > mail_max_userip_connections = 100
> > maildir_copy_with_hardlinks = yes
> > disable_plaintext_auth = no
> > dotlock_use_excl=yes
> > mmap_disable = yes
> > protocols = imap imaps pop3 pop3s managesieve
> > protocol imap {
> >   mail_plugins = quota imap_quota
> >   imap_client_workarounds = outlook-idle delay-newmail
> > }
> > protocol pop3 {
> >   mail_plugins = quota
> >   pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
> >   pop3_uidl_format = %08Xu%08Xv
> > }
> > protocol lda {
> >   mail_plugins = quota sieve
> >   log_path = /var/log/dovecot-deliver.log
> >   info_log_path = /var/log/dovecot-deliver.log
> > }
> > protocol managesieve {
> >   managesieve_implementation_string = dovecot
> >  }
> > auth default {
> > mechanisms = plain login
> >   passdb sql {
> >     args = /etc/dovecot/sql.conf
> >   }
> >  userdb prefetch {
> >   }
> >   userdb sql {
> >     args = /etc/dovecot/sql.conf
> >   }
> >     user = nobody
> >   socket listen {
> >     master {
> >       path = /var/run/dovecot/auth-master
> >       mode = 0660
> >       user = vmail
> >       group = mail
> >     }
> >     client {
> >       path = /var/spool/postfix/private/auth
> >       mode = 0660
> >       user = postfix
> >       group = mail
> > }
> >
> > We are having severals  problems from "cpu stuck for 61 seconds"   to
> > "too many connexion".
> >
> > I wonder if there is a configuation type of dovecot when using ocfs2.
> > In tje dovecot site they give advices about how to configure dovecot
> > when using NFS, but not about OCFS2.
> > Somme people say that lda shuld not be used.
> > Any help please?
> >
> > Thanks
> > nebano
>
> first upgrade your dovecot and i.e postfix to latest versions
> use lmtp instead of lda
> read
> http://wiki1.dovecot.org/MailLocation/SharedDisk
> look archives here
> i use 5000 mailboxes on maildir  with drbd ocfs2 ,no problem so far
> there is an option mail if you format with ocfs2
> look bottlenecks with your ISCSI
> as the nature of the beast there may be several reasons for your problem
> but there is no known reason or bug to me why you shouldnt use ocfs2
> you need to make more analysis
> --
> Best Regards
>
> MfG Robert Schetterer
>
> Germany/Munich/Bavaria
>