We have dropped dovecot in place of UW-IMAP for about 40000 users and have solved our immediate problem: disk I/O overload, mainly from people doing POP3 and "leave mail on server". Thank you!
Now i got loads of dovecot error messages in the logs and don't know if there is any significance. Here are a few examples:
The most common event is:
2007-12-06 16:00:17.837654500 dovecot: Error: IMAP(xxxxxxxx): FETCH for mailbox UCE-TMP UID 1547 got too little data: 5176 vs 5184 2007-12-06 16:00:18.575403500 dovecot: Error: IMAP(xxxxxxxx): FETCH for mailbox UCE-TMP UID 1548 got too little data: 4749 vs 4757 2007-12-06 16:00:19.276147500 dovecot: Error: IMAP(xxxxxxxx): FETCH for mailbox UCE-TMP UID 1548 got too little data: 4749 vs 4757 2007-12-06 16:00:20.371238500 dovecot: Error: IMAP(xxxxxxxx): FETCH for mailbox UCE-TMP UID 1540 got too little data: 5162 vs 5170 2007-12-06 16:00:20.996483500 dovecot: Error: IMAP(xxxxxxxx): FETCH for mailbox UCE-TMP UID 1540 got too little data: 5162 vs 5170 2007-12-06 16:00:21.650218500 dovecot: Error: IMAP(xxxxxxxx): FETCH for mailbox UCE-TMP UID 1541 got too little data: 4086 vs 4094 2007-12-06 16:00:22.273782500 dovecot: Error: IMAP(xxxxxxxx): FETCH for mailbox UCE-TMP UID 1541 got too little data: 4086 vs 4094 2007-12-06 16:00:22.920507500 dovecot: Error: IMAP(xxxxxxxx): FETCH for mailbox UCE-TMP UID 1542 got too little data: 3556 vs 3562 2007-12-06 16:00:23.490787500 dovecot: Error: IMAP(xxxxxxxx): FETCH for mailbox UCE-TMP UID 1542 got too little data: 3556 vs 3562 2007-12-06 16:00:24.052849500 dovecot: Error: IMAP(xxxxxxxx): FETCH for mailbox UCE-TMP UID 1543 got too little data: 4098 vs 4106 2007-12-06 16:00:24.741072500 dovecot: Error: IMAP(xxxxxxxx): FETCH for mailbox UCE-TMP UID 1543 got too little data: 4098 vs 4106 2007-12-06 16:00:25.448977500 dovecot: Error: IMAP(xxxxxxxx): FETCH for mailbox UCE-TMP UID 1544 got too little data: 4627 vs 4635 2007-12-06 16:00:26.130131500 dovecot: Error: IMAP(xxxxxxxx): FETCH for mailbox UCE-TMP UID 1544 got too little data: 4627 vs 4635 2007-12-06 16:00:26.819376500 dovecot: Error: IMAP(xxxxxxxx): FETCH for mailbox UCE-TMP UID 1545 got too little data: 7582 vs 7590 2007-12-06 16:00:27.445497500 dovecot: Error: IMAP(xxxxxxxx): FETCH for mailbox UCE-TMP UID 1545 got too little data: 7582 vs 7590
Somewhat rarer are events like
2007-12-06 19:36:44.114294500 dovecot: Info: POP3(yyyyyyyy): Disconnected: Storage error during logout. top=1/1723, retr=1/4665462, del=27/61, size=17280696
and rarely we got
2007-11-24 12:10:01.086620500 dovecot: Error: IMAP(zzzzzzzz): file istream-header-filter.c: line 194 (read_header): assertion failed: (hdr == NULL) 2007-11-24 12:10:01.086718500 dovecot: Error: IMAP(zzzzzzzz): Raw backtrace: 2007-11-24 12:10:01.089552500 dovecot: Error: child 13083 (imap) killed with signal 6 2007-11-24 12:10:01.655875500 dovecot: Error: IMAP(zzzzzzzz): file istream-header-filter.c: line 194 (read_header): assertion failed: (hdr == NULL) 2007-11-24 12:10:01.656106500 dovecot: Error: IMAP(zzzzzzzz): Raw backtrace: 2007-11-24 12:10:01.659853500 dovecot: Error: child 13098 (imap) killed with signal 6 2007-11-24 12:10:02.022553500 dovecot: Error: IMAP(zzzzzzzz): file istream-header-filter.c: line 194 (read_header): assertion failed: (hdr == NULL) 2007-11-24 12:10:02.022761500 dovecot: Error: IMAP(zzzzzzzz): Raw backtrace: 2007-11-24 12:10:02.025866500 dovecot: Error: child 13121 (imap) killed with signal 6
Our dovecot is
# 1.0.5: /usr/local/dovecot/etc/dovecot.conf log_path: /dev/stderr log_timestamp: protocols: pop3 imap listen(default): 134.147.64.16:143 listen(imap): 134.147.64.16:143 listen(pop3): 134.147.64.16:110 ssl_disable: yes disable_plaintext_auth: no login_dir: /var/run/dovecot/login login_executable(default): /usr/local/dovecot/libexec/dovecot/imap-login login_executable(imap): /usr/local/dovecot/libexec/dovecot/imap-login login_executable(pop3): /usr/local/dovecot/libexec/dovecot/pop3-login login_process_per_connection: no valid_chroot_dirs: /net/sunu007/disc3/home:/net/sunu007/disc4/home max_mail_processes: 4096 first_valid_uid: 50 mail_location: mbox:~/Mail:INBOX=~/Mailbox:INDEX=~/ mail_executable(default): /usr/local/dovecot/libexec/dovecot/imap mail_executable(imap): /usr/local/dovecot/libexec/dovecot/imap mail_executable(pop3): /usr/local/dovecot/libexec/dovecot/pop3 mail_plugin_dir(default): /usr/local/dovecot/lib/dovecot/imap mail_plugin_dir(imap): /usr/local/dovecot/lib/dovecot/imap mail_plugin_dir(pop3): /usr/local/dovecot/lib/dovecot/pop3 mail_log_max_lines_per_sec: 0 pop3_uidl_format(default): pop3_uidl_format(imap): pop3_uidl_format(pop3): %08Xu%08Xv auth default: passdb: driver: shadow args: blocking=yes userdb: driver: passwd
Is there anything we should do? The crashes have stopped in the meantime, it seems.
Jost
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