Sounds like an issue with nfs 4 to me? We're running nfs3 very happily no issues like this have happened. I don't see that running nfs4 offers many advantages over v3 for the email workload.
Mark -- Mark Zealey -- Shared Hosting Team Leader Product Development * Webfusion 123-reg.co.uk, webfusion.co.uk, donhost.co.uk, supanames.co.uk This mail is subject to http://www.gxn.net/disclaimer > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] > On Behalf Of Rod Treweek > Sent: 11 November 2008 00:07 > To: dovecot@dovecot.org > Cc: Tait Grove > Subject: [Dovecot] Unbreakable NFS locking issues... > > Hello All, > > We are struggling to find a solution to a problem we are > encountering > with a load-balanced email setup. Currently, we have a Coyote > loadbalancer, > and 3 Postfix/Dovecot nodes that then get their information > from a mysql > database. The problem is that after a couple weeks, we start > seeing NFS > locking issues occur, which then takes email completely down, > requiring a > site visit to basically do an interactive mode reboot to shut > off NFS so > that we can remount the filesystem again. We have our mailstore on an > Aberdeen NAS which is accessed over NFS v. 4. > > Dovecot version 1.1.2 > > Here's the relevant mysql string: > > grep -v '^ *\(#.*\)\?$' dovecot-mysql.conf > driver = mysql > connect = host=X.X.X.X dbname=Something user=Something > password=Something > password_query = SELECT username as user, password, > concat('/NFS1MAILDIR/mailSysV2/', maildir) as userdb_home, > concat('maildir:/NFS1MAILDIR/mailSysV2/', maildir) as > userdb_mail, 143 as > userdb_uid, 143 as userdb_gid, concat('*:bytes=', > floor(quota*1024)) AS > quota_rule FROM mailbox WHERE username = '%u' AND active = '1' > user_query = SELECT concat('/NFS1MAILDIR/mailSysV2/', > maildir) as home, > concat('maildir:/NFS1MAILDIR/mailSysV2/', maildir) as mail, > concat('maildir:/NFS1MAILDIR/mailSysV2/', maildir) as > maildir, 143 AS uid, > 143 AS gid, concat('*:bytes=', floor(quota*1024)) AS > quota_rule FROM mailbox > WHERE username = '%u' AND active = '1' > > > And here's what our configuration is on each of the nodes: > > dovecot -n > # 1.1.2: /usr/local/etc/dovecot.conf > protocols: imap pop3 > ssl_ca_file: /usr/local/etc/dovecot/certs/tdpserver.crt > ssl_cert_file: /usr/local/etc/dovecot/certs/tdpserver.crt > ssl_key_file: /usr/local/etc/dovecot/certs/tdpserver.key > ssl_parameters_regenerate: 0 > ssl_cipher_list: ALL:!LOW:!SSLv2 > disable_plaintext_auth: no > login_dir: /var/run/dovecot/login > login_executable(default): /usr/local/libexec/dovecot/imap-login > login_executable(imap): /usr/local/libexec/dovecot/imap-login > login_executable(pop3): /usr/local/libexec/dovecot/pop3-login > login_user: postfix > login_greeting: Something witty here.. > login_process_per_connection: no > login_max_connections: 512 > max_mail_processes: 2048 > mail_max_userip_connections: 50 > verbose_proctitle: yes > first_valid_uid: 69 > last_valid_uid: 500 > first_valid_gid: 69 > last_valid_gid: 500 > mail_access_groups: postfix > mail_privileged_group: postfix > mail_location: > mbox:/NFS1MAILDIR/mailSysV2/%d/%u:INDEX=/usr/local/mail/indexe > s/%d/%1n/%n > mmap_disable: yes > dotlock_use_excl: no > mail_nfs_storage: yes > mail_nfs_index: yes > mail_executable(default): /usr/local/libexec/dovecot/imap > mail_executable(imap): /usr/local/libexec/dovecot/imap > mail_executable(pop3): /usr/local/libexec/dovecot/pop3 > mail_plugins(default): quota imap_quota > mail_plugins(imap): quota imap_quota > mail_plugins(pop3): quota > mail_plugin_dir(default): /usr/local/lib/dovecot/imap > mail_plugin_dir(imap): /usr/local/lib/dovecot/imap > mail_plugin_dir(pop3): /usr/local/lib/dovecot/pop3 > imap_client_workarounds(default): delay-newmail netscape-eoh > tb-extra-mailbox-sep > imap_client_workarounds(imap): delay-newmail netscape-eoh > tb-extra-mailbox-sep > imap_client_workarounds(pop3): > pop3_client_workarounds(default): > pop3_client_workarounds(imap): > pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh > auth default: > mechanisms: login plain > user: dovecot > passdb: > driver: sql > args: /usr/local/etc/dovecot-mysql.conf > userdb: > driver: sql > args: /usr/local/etc/dovecot-mysql.conf > socket: > type: listen > client: > path: /var/spool/postfix/private/auth > mode: 432 > user: postfix > group: postfix > master: > path: /var/run/dovecot/auth-master > mode: 384 > user: dovecot > group: dovecot > plugin: > quota: dict:user::proxy::quota > imap_quota: dict:user::proxy::quota > quota_rule: *:storage=528576 > dict: > quota: mysql:/usr/local/etc/dovecot/dovecot-dict-quota.conf > > > > Any help you can offer is greatly, greatly appreciated, as > well as opinions > on any other 'validated' postfix/dovecot email enterprise > design solutions. > > Thanks Very Much In Advance, > > R.T >
