[Dovecot] dovecot & OCFS2 Cluster

[Robert Schetterer]

Am 26.04.2011 00:54, schrieb 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

havent seen here, but maybe it was allready patched
> 
> I have several performance problens with ocfs2 but now i guess the
> problem is the webmail client that we are using.

got slowness with squirrelmail
also with apache php on drbd ocfs2
fixed it with
http://www.drbd.org/users-guide/s-latency-tuning.html

elevator=deadline in grub


> 
> 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 ?

i.e avoid backscatter by overquota
performance should better too

> 
> My setup have about 5000 active acounts all in maildir.
> 
> And i have never had you cpu problem.

same here no cpu problems
perhaps it would help to see what configured lda i.e postfix setup
> 
> 
> []'sf.rique

dont top post
> 
> 
> On Mon, Apr 25, 2011 at 3:53 PM, Robert Schetterer
> <robert at schetterer.org <mailto: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
> 
> 


-- 
Best Regards

MfG Robert Schetterer

Germany/Munich/Bavaria