Very high load

[absolutely_free at libero.it]

Hi Aki,

thank you very much for your reply.

What do you mean with "triggering maildir scans"?

Here is dovecot -n output:


# 2.0.9: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-642.15.1.el6.x86_64 x86_64 CentOS release 6.9 (Final)
auth_mechanisms = plain login digest-md5 cram-md5
debug_log_path = /var/log/dovecot.log
disable_plaintext_auth = no
first_valid_gid = 89
first_valid_uid = 89
mail_gid = 89
mail_location = maildir:/var/spool/domains
mail_uid = 89
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date imapflags notify
mbox_write_locks = fcntl
namespace {
inbox = yes
location =
prefix = INBOX.
separator = .
type = private
}
passdb {
args = /etc/dovecot/dovecot-sql.conf.ext
driver = sql
}
passdb {
args = /etc/dovecot/dovecot-sql-crypt.conf.ext
driver = sql
}
plugin {
sieve = ~/.dovecot.sieve
sieve_dir = ~/sieve
sieve_extensions = +notify +imapflags
sieve_max_script_size = 1M
}
protocols = imap pop3 lmtp sieve
ssl_cert = </etc/nginx/ssl/wildcard.domain.net_bundle.crt
ssl_key = </etc/nginx/ssl/wildcard.domain.net.key
userdb {
args = /etc/dovecot/dovecot-sql.conf.ext
driver = sql
}
protocol lmtp {
mail_plugins =
}
protocol lda {
mail_plugins =
}
protocol imap {
imap_id_log = *
}


Thank you very much


> 
>     Il 21 settembre 2017 alle 11.13 Aki Tuomi <aki.tuomi at dovecot.fi> ha scritto:
> 
>     On 21.09.2017 00:56, absolutely_free at libero.it wrote:
> 
>         > > 
> >         Hi,
> > 
> >         I am using dovecot 2.0.9 (official CentOS rpm), I am experiencing very high load issue.
> > 
> >         I think it is something related to my storage (/var/spool is about 3 TB and it is almost full).
> > 
> >         I noticed those kind of messages in /var/log/maillog:
> > 
> >         Warning: Maildir: Scanning /var/spool/pop/domains/domain.it/username/Maildir/cur took 100 seconds (14281 readdir()s, 0 rename()s to cur/)
> >         Maybe you have just too much load on your server. Also you seem to be
> >         triggering maildir scans which are expensive.
> > 
> >     > 
>     Also the version you are running is from 2011, so it's ... rather dated.
>     You should probably update your system to centos7 which at least has
>     2.2.10, which is still rather old, but less so.
>     >
> 
>         > > 
> >         Warning: Maildir /var/spool/pop/domains/domain.it/username/Maildir: Synchronization took 103 seconds (0 new msgs, 0 flag change attempts, 0 expunge attempts)
> > 
> >         I wondering if there is something to try, at configuration level, to "mitigate" this..
> > 
> >         I use Maildir format, MTA is postfix, I have many users (> 10000) with pop3/imap/webmail access. Physical server with 8 GB RAM and two CPU (Intel(R) Pentium(R) D CPU 3.00GHz)
> > 
> >         This is my dovecot's conf:
> > 
> >         please use doveconf -n
> > 
> >     > 
>     Aki
>