Hi,

I have problems with dovecot + ldap + nfs, we could't have more than

20 concurrent sessions of pop3, when user 21 comes, the auth process takes more than 1 sec and is incresing (while most users arrives, more delay in autenticacion exists) and my customers complaint about the service. We need support about 200 concurrents pop3 users, here is my details

Front Internet 1 Load Balancer configured with 2 servers reals

App Servers 2 Servers Xeon 3.0Ghz, 4G Ram, rhel4 update 7 Dovecot 1.1.8 (i386 rpm complied by source rpm from fedora core 10)

Ldap Server 2 Server Xeon QuadCore 2.5Ghz, 8G Ram, rhel5 update 2 Openldap 2.0.X (x86_64 rpms compiled by source rpm from rhel3)

Nfs Server 1 Server Xeon 3.0Ghz, 4G Ram, rhel3 update 4

My conf:

# 1.1.8: dovecot.conf # OS: Linux 2.6.9-78.0.13.ELsmp i686 Red Hat Enterprise Linux ES release 4 (Nahant Update 7) protocols: imap pop3 listen(default): app-server:143 listen(imap): app-server:143 listen(pop3): app-server:110 ssl_disable: yes login_dir: /var/run/dovecot/login-mail login_executable(default): /usr/libexec/dovecot/imap-login login_executable(imap): /usr/libexec/dovecot/imap-login login_executable(pop3): /usr/libexec/dovecot/pop3-login login_greeting: Welcome POP3/IMAP Server New on app1. login_process_per_connection: no login_process_size: 256 login_processes_count: 50 mail_max_userip_connections(default): 50 mail_max_userip_connections(imap): 50 mail_max_userip_connections(pop3): 10 verbose_proctitle: yes first_valid_uid: 8 mail_uid: 8 mail_gid: 12 mail_location: maildir:%h/Maildir:INDEX=/var/cache/dovecot/indexes/%2d/%1u/%2u/%u mail_debug: yes mail_full_filesystem_access: yes mmap_disable: yes mail_nfs_storage: yes mail_executable(default): /usr/libexec/dovecot/imap mail_executable(imap): /usr/libexec/dovecot/imap mail_executable(pop3): /usr/libexec/dovecot/pop3 mail_plugins(default): quota imap_quota mail_plugins(imap): quota imap_quota mail_plugins(pop3): quota mail_log mail_plugin_dir(default): /usr/lib/dovecot/imap mail_plugin_dir(imap): /usr/lib/dovecot/imap mail_plugin_dir(pop3): /usr/lib/dovecot/pop3 pop3_uidl_format(default): %08Xu%08Xv pop3_uidl_format(imap): %08Xu%08Xv pop3_uidl_format(pop3): UID%u-%v pop3_client_workarounds(default): pop3_client_workarounds(imap): pop3_client_workarounds(pop3): outlook-no-nuls auth default: realms: domain.cl default_realm: domain.cl verbose: yes debug: yes debug_passwords: yes count: 32 worker_max_count: 16 passdb: driver: ldap args: /etc/dovecot/dovecot-ldap-new.conf userdb: driver: ldap args: /etc/dovecot/dovecot-ldap-new.conf plugin: quota: maildir mail_log_events: delete undelete expunge copy mailbox_delete mail_log_fields: uid box msgid size

# dovecot-ldap-new.conf

hosts = 10.1.2.3 10.1.2.4 dn = cn=Usr,o=USERS,c=CL dnpass = pass sasl_bind = no tls = no auth_bind = yes ldap_version = 3 base = dc=%d,o=MAIL,o=USERS,c=CL scope = subtree user_attrs = mailMessageStore=mail:INDEX=/var/cache/dovecot/indexes/%2d/%1u/%2u/%u,homeDi rectory=home,,,uidNumber=uid,gidNumber=gid,mailQuota=quota:storage user_filter = (&(objectClass=posixAccount)(uid=%n)) pass_attrs = mail=user,userPassword=password pass_filter = (&(objectClass=posixAccount)(uid=%n)) default_pass_scheme = CRYPT

Regards

Mauricio López Riffo Red Hat Certified Engineer 804006455319519 Netline Telecomunicaciones Chile Los Conquistadores 2430, Providencia, Santiago. Codigo Postal: 7530041 Fono: +562 6560600 Móvil: +569 90992366