[Dovecot] Tuning!

[Gedalya]

Dovecot is probably waiting for your storage to respond, you should 
probably take a more detailed look at your NFS link and at the 
conditions on the NFS server side.


On 05/02/2013 01:00 PM, Rafael VOlpe TI wrote:
> Hi Buddies,
>
> I have 2 servers running dovecot + postfix for pop/imap users.
> The users mailbox are in a Nfs storage.
> The load of server is ranging at 3.0 to 15.0.
> I really dont know what happened.. I read a lot about tuning of dovecot,
> and the changes are applied, how you can see.
> The Hardware of server is really good!
> The host have 8GB of mem and 2 sockets with 2 cores anyone.
> The server receives 900-1000 user connections in pop and imap.
> How i can aprimmorate this processes?
>
> Some errors are displayed on the console randomly when the load rises.
> Example:
>
> May 02 13:57:42 pop3(user at domain.com): Error: Timeout (180s) while waiting
> for lock for transaction log file //var/vmail/
> domain.com/user//dovecot.index.log
> May 02 13:57:42 pop3(user at domain.com): Error: Couldn't init INBOX: Internal
> error occurred. Refer to server log for more information. [2013-05-02
> 13:54:40]
> May 02 13:57:42 pop3(user at domain.com): Info: Mailbox init failed top=0/0,
> retr=0/0, del=0/0, size=0
>
> I really appreciate any suggestion!
>
> Thanks and Regards,
>
> Rafael Volpe
>
>
> Dovecot conf:
>
> # 2.0.19: /etc/dovecot/dovecot.conf
> # OS: Linux 3.2.0-40-generic x86_64 Ubuntu 12.04.2 LTS
> auth_mechanisms = plain login
> auth_verbose = yes
> debug_log_path = /var/log/dovecot-debug.log
> disable_plaintext_auth = no
> dotlock_use_excl = no
> first_valid_gid = 125
> first_valid_uid = 125
> last_valid_gid = 125
> last_valid_uid = 125
> log_path = /var/log/dovecot.log
> mail_debug = yes
> mail_fsync = always
> mail_location = maildir:/%Lh/:INDEX=/%Lh/
> mail_nfs_index = yes
> mail_nfs_storage = yes
> mmap_disable = yes
> passdb {
>    args = /etc/dovecot/dovecot-sql.conf
>    driver = sql
> }
> protocols = " imap pop3"
> service auth {
>    unix_listener /var/spool/postfix/private/auth {
>      group = postfix
>      mode = 0660
>      user = postfix
>    }
> }
> service imap-login {
>    inet_listener imap {
>      port = 143
>    }
>    inet_listener imaps {
>      port = 993
>      ssl = yes
>    }
>    service_count = 0
> }
> service pop3-login {
>    inet_listener pop3 {
>      port = 110
>    }
>    inet_listener pop3s {
>      port = 995
>      ssl = yes
>    }
> }
> ssl_cert = </etc/postfix/ssl/wildcard.domain.com.crt
> ssl_key = </etc/postfix/ssl/wildcard.domain.com.key
> userdb {
>    args = /etc/dovecot/dovecot-sql.conf
>    driver = sql
> }
> verbose_proctitle = yes
> protocol imap {
>    imap_idle_notify_interval = 2 mins
>    mail_max_userip_connections = 150
> }
> protocol pop3 {
>    pop3_lock_session = no
>    pop3_uidl_format = %08Xu%08Xv
> }
>
>
> Postfix conf:
>
> alias_database = hash:/etc/aliases
> alias_maps = hash:/etc/aliases
> append_dot_mydomain = no
> biff = no
> bounce_queue_lifetime = 1d
> broken_sasl_auth_clients = yes
> config_directory = /etc/postfix
> content_filter = smtp-amavis:[127.0.0.1]:10024
> inet_interfaces = all
> mailbox_size_limit = 0
> maximal_queue_lifetime = 1d
> message_size_limit = 20240000
> myhostname = myname.mydomain.com
> mynetworks = 127.0.0.0/8
> myorigin = /etc/mailname
> policy-spf_time_limit = 3600s
> readme_directory = no
> recipient_bcc_maps = mysql:/etc/postfix/mysql_bcc.cf
> recipient_delimiter = +
> relay_domains = proxy:mysql:/etc/postfix/mysql_relay_domains_maps.cf
> relayhost =
> sender_bcc_maps = mysql:/etc/postfix/mysql_bcc.cf
> smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
> smtpd_banner = Welcome to $myhostname
> smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated,
> check_client_access mysql:/etc/postfix/mysql_access.cf,
> reject_unknown_client, reject_unknown_client_hostname,
> reject_unauth_pipelining, reject_rbl_client bl.spamcop.net,
> reject_rbl_client zen.spamhaus.org, reject_rbl_client b.barracudacentral.org
> smtpd_end_of_data_restrictions = check_policy_service inet:127.0.0.1:10031
> smtpd_helo_required = yes
> smtpd_helo_restrictions = permit_mynetworks, permit_sasl_authenticated,
> reject_non_fqdn_helo_hostname, reject_invalid_helo_hostname,
> reject_invalid_hostname
> smtpd_recipient_restrictions = reject_unknown_sender_domain,
> reject_unknown_recipient_domain, reject_non_fqdn_sender,
> reject_non_fqdn_recipient, reject_unlisted_recipient, check_policy_service
> inet:127.0.0.1:10031, permit_mynetworks, permit_sasl_authenticated,
> reject_unauth_destination, check_policy_service unix:private/policy-spf
> smtpd_reject_unlisted_sender = yes
> smtpd_sasl_auth_enable = yes
> smtpd_sasl_local_domain = $mydomain
> smtpd_sasl_path = private/auth
> smtpd_sasl_security_options = noanonymous
> smtpd_sasl_type = dovecot
> smtpd_sender_restrictions = permit_mynetworks, permit_sasl_authenticated,
> reject_unauth_pipelining, reject_unauth_destination
> smtpd_timeout = 30
> smtpd_tls_cert_file = /etc/postfix/ssl/wildcard.domain.com.crt
> smtpd_tls_key_file = /etc/postfix/ssl/wildcard.domain.com.key
> smtpd_tls_security_level = may
> smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
> transport_maps = mysql:/etc/postfix/mysql_transport.cf
> vacation_destination_recipient_limit = 1
> virtual_alias_maps = mysql:/etc/postfix/mysql_virtual_alias_maps.cf
> virtual_gid_maps = static:125
> virtual_mailbox_base = /var/vmail
> virtual_mailbox_domains = mysql:/etc/postfix/mysql_virtual_domains_maps.cf
> virtual_mailbox_limit = 51200000
> virtual_mailbox_maps = mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
> virtual_minimum_uid = 125
> virtual_transport = virtual
> virtual_uid_maps = static:125
>