Courier to Dovecot

[neutro]

I wonder if my current setup maildir - courier and I want to convert to dovecot will all emails be downloaded again in outlook?
Many users keep copies of email in the server.

[sehh]

I would also like to know that...

btw, is there a significant reason why we should change to dovecot?

[neutro]

lower memory usage of course. I have a lot of business customers using imap protocol and eating up a lot of memory.

[cpanelkenneth]

I wonder if my current setup maildir - courier and I want to convert to dovecot will all emails be downloaded again in outlook?
Many users keep copies of email in the server.

This question is addressed in the release notes:

http://www.cpanel.net/products/cpwhm...vecot-1.1.html

[sphen]

my question would be how well does dovecot work with quotas and large amounts of email in comparison to courier? i have a 32bit OS installed on my server right now and that limits the courier install for some reason to no quota larger than 2047 MB without things going haywire. i would love to see if dovecot handles larger quotas in a more graceful way... anyone using dovecot yet?

[cpanelkenneth]

my question would be how well does dovecot work with quotas and large amounts of email in comparison to courier? i have a 32bit OS installed on my server right now and that limits the courier install for some reason to no quota larger than 2047 MB without things going haywire. i would love to see if dovecot handles larger quotas in a more graceful way... anyone using dovecot yet?

That particular issue is due to a bug/design flaw in Courier. Dovecot does not suffer from that.

[simon templar]

I'd like to know how many people went from courier to dovecot without any issue...

[sirotex]

We have with no issues at all.

[nightfall_sg]

After changing over to Dovecot, I experience high loads not previously experienced. They were frequent and for long periods.

Here is sample of processes running when one of this high load period occurred.

Notice the numerous instances of EXIM running. Not sure if this is due to the change to DoveCot.

Any help with this is much appreciated!

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
11988 root 15 0 10804 8332 1792 D 13.8 0.8 0:38.15 tailwatchd
1 root 15 0 1716 612 520 S 0.0 0.1 0:01.09 init
1598 nobody 15 0 21832 12m 3512 S 0.0 1.2 0:00.00 httpd
1599 nobody 15 0 21832 12m 3516 S 0.0 1.2 0:00.00 httpd
1977 mailnull 16 0 8548 3956 2728 S 0.0 0.4 0:00.04 exim
1996 mailnull 16 0 7580 2048 1572 S 0.0 0.2 0:00.00 exim
3132 mailnull 15 0 8496 3948 2732 S 0.0 0.4 0:00.05 exim
3133 root 16 0 1616 520 436 D 0.0 0.0 0:17.53 syslogd
3201 mailnull 18 0 8532 3596 2376 S 0.0 0.3 0:00.02 exim
3269 root 15 0 1564 376 308 S 0.0 0.0 0:00.17 klogd
3322 root 15 0 11352 8400 1288 S 0.0 0.8 0:00.05 tailwatchd
3827 root 15 0 21696 13m 5024 S 0.0 1.3 0:05.61 httpd
3938 root 16 0 3688 928 724 S 0.0 0.1 0:00.05 pure-authd
5432 mailnull 15 0 8548 3988 2760 S 0.0 0.4 0:00.03 exim
5854 nobody 15 0 1620 676 528 S 0.0 0.1 0:00.00 eximwrap
5883 mailnull 15 0 7580 2172 1696 S 0.0 0.2 0:00.00 exim
5885 root 18 0 2508 932 532 S 0.0 0.1 0:00.89 crond
5962 mailnull 15 0 7576 1704 1248 S 0.0 0.2 0:00.00 exim
5963 mailnull 15 0 7580 1876 1400 S 0.0 0.2 0:00.00 exim
5988 mailnull 15 0 7580 1876 1400 S 0.0 0.2 0:00.00 exim
5997 nobody 18 0 1620 676 528 S 0.0 0.1 0:00.00 eximwrap
6044 root 15 0 1576 556 424 S 0.0 0.1 0:00.00 eximwrap
6056 mailnull 16 0 7852 2016 1524 D 0.0 0.2 0:00.00 exim
6102 mailnull 15 0 7708 2880 2312 S 0.0 0.3 0:00.00 exim
6122 mailnull 15 0 7588 1688 1228 S 0.0 0.2 0:00.00 exim
6129 mailnull 16 0 7544 1264 828 S 0.0 0.1 0:00.00 exim
6131 mailnull 15 0 7576 1704 1240 S 0.0 0.2 0:00.00 exim
6137 mailnull 15 0 7576 1704 1248 S 0.0 0.2 0:00.00 exim
7182 mailnull 15 0 7576 1788 1320 S 0.0 0.2 0:00.00 exim
7189 mailnull 15 0 7588 1688 1228 S 0.0 0.2 0:00.00 exim
7190 nobody 18 0 1972 900 680 R 0.0 0.1 0:00.01 top
7517 xfs 15 0 3140 1364 752 S 0.0 0.1 0:00.00 xfs
11294 root 22 0 1788 656 492 S 0.0 0.1 0:03.58 dovecot
11295 root 15 0 2272 984 728 S 0.0 0.1 0:03.75 dovecot-auth
11302 dovecot 15 0 3624 1572 1280 S 0.0 0.1 0:00.08 pop3-login
11304 dovecot 15 0 3624 1572 1280 S 0.0 0.1 0:00.27 pop3-login
11305 dovecot 15 0 3824 1860 1400 S 0.0 0.2 0:02.63 pop3-login
11306 dovecot 15 0 3772 1768 1400 S 0.0 0.2 0:00.58 pop3-login
11307 dovecot 15 0 3624 1564 1280 S 0.0 0.1 0:00.09 pop3-login
11308 dovecot 15 0 3632 1588 1284 S 0.0 0.2 0:00.04 imap-login
11309 dovecot 15 0 3776 1768 1396 S 0.0 0.2 0:00.09 imap-login
11310 dovecot 21 0 3776 1828 1396 S 0.0 0.2 0:00.33 imap-login
11311 dovecot 15 0 3636 1568 1284 S 0.0 0.1 0:00.02 imap-login
11312 dovecot 15 0 3764 1768 1396 S 0.0 0.2 0:00.03 imap-login
11477 nobody 15 0 22212 12m 3972 S 0.0 1.2 0:00.58 httpd
11482 root 15 0 5832 3960 916 S 0.0 0.4 0:21.98 cphulkd.pl
11523 nobody 16 0 22804 13m 3992 S 0.0 1.3 0:00.77 httpd
12237 root 15 0 13536 7924 476 S 0.0 0.8 0:00.00 cpdavd
13315 root 15 0 9840 8028 1304 S 0.0 0.8 0:31.51 lfd
13589 root 34 19 3688 1804 872 S 0.0 0.2 0:00.10 cpanellogd
15689 root 18 0 86040 62m 972 S 0.0 6.1 0:12.40 clamd
15976 root 15 0 4128 1048 756 S 0.0 0.1 0:00.00 sshd
16351 root 17 0 2236 1100 936 S 0.0 0.1 0:00.01 mysqld_safe
17414 mysql 15 0 64540 23m 4028 S 0.0 2.3 1:36.66 mysqld
17730 nobody 18 0 21832 12m 3688 S 0.0 1.2 0:00.02 httpd
20290 named 20 0 72744 7464 1928 S 0.0 0.7 1:01.94 named
20388 root 17 0 1996 360 236 S 0.0 0.0 0:00.72 vzctl
20389 root 15 0 2240 1252 1032 S 0.0 0.1 0:00.01 bash
21578 root 15 0 1972 996 772 S 0.0 0.1 0:38.67 top
22369 nobody 15 0 21828 12m 3780 S 0.0 1.2 0:00.05 httpd
22370 nobody 15 0 21828 12m 3696 S 0.0 1.2 0:00.05 httpd
22449 mailnull 15 0 7536 1104 700 S 0.0 0.1 0:00.00 exim
22456 mailnull 15 0 7536 1208 792 S 0.0 0.1 0:01.06 exim
22460 mailnull 21 0 7548 1136 732 S 0.0 0.1 0:00.00 exim
22516 nobody 15 0 22220 12m 3984 S 0.0 1.2 0:00.66 httpd
26474 mailnull 15 0 21692 17m 796 S 0.0 1.7 0:00.04 MailScanner
27830 mailnull 18 0 63992 59m 4516 S 0.0 5.8 0:43.24 MailScanner
28253 root 18 0 17036 8004 1056 S 0.0 0.8 0:01.67 cpsrvd-ssl
30425 root 15 0 3944 1344 1040 S 0.0 0.1 0:00.16 pure-ftpd
30668 nobody 18 0 21832 12m 3692 S 0.0 1.2 0:00.01 httpd
30671 nobody 15 0 21832 12m 3524 S 0.0 1.2 0:00.00 httpd

[rhenderson]

We have with no issues at all.

I second that, we had no issues, no old mail re downloaded, no high loads here.

[cpanelnick]

After changing over to Dovecot, I experience high loads not previously experienced. They were frequent and for long periods.

Here is sample of processes running when one of this high load period occurred.

Notice the numerous instances of EXIM running. Not sure if this is due to the change to DoveCot.

Any help with this is much appreciated!

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
11988 root 15 0 10804 8332 1792 D 13.8 0.8 0:38.15 tailwatchd
1 root 15 0 1716 612 520 S 0.0 0.1 0:01.09 init
1598 nobody 15 0 21832 12m 3512 S 0.0 1.2 0:00.00 httpd
1599 nobody 15 0 21832 12m 3516 S 0.0 1.2 0:00.00 httpd
1977 mailnull 16 0 8548 3956 2728 S 0.0 0.4 0:00.04 exim
1996 mailnull 16 0 7580 2048 1572 S 0.0 0.2 0:00.00 exim
3132 mailnull 15 0 8496 3948 2732 S 0.0 0.4 0:00.05 exim
3133 root 16 0 1616 520 436 D 0.0 0.0 0:17.53 syslogd
3201 mailnull 18 0 8532 3596 2376 S 0.0 0.3 0:00.02 exim
3269 root 15 0 1564 376 308 S 0.0 0.0 0:00.17 klogd
3322 root 15 0 11352 8400 1288 S 0.0 0.8 0:00.05 tailwatchd
3827 root 15 0 21696 13m 5024 S 0.0 1.3 0:05.61 httpd
3938 root 16 0 3688 928 724 S 0.0 0.1 0:00.05 pure-authd
5432 mailnull 15 0 8548 3988 2760 S 0.0 0.4 0:00.03 exim
5854 nobody 15 0 1620 676 528 S 0.0 0.1 0:00.00 eximwrap
5883 mailnull 15 0 7580 2172 1696 S 0.0 0.2 0:00.00 exim
5885 root 18 0 2508 932 532 S 0.0 0.1 0:00.89 crond
5962 mailnull 15 0 7576 1704 1248 S 0.0 0.2 0:00.00 exim
5963 mailnull 15 0 7580 1876 1400 S 0.0 0.2 0:00.00 exim
5988 mailnull 15 0 7580 1876 1400 S 0.0 0.2 0:00.00 exim
5997 nobody 18 0 1620 676 528 S 0.0 0.1 0:00.00 eximwrap
6044 root 15 0 1576 556 424 S 0.0 0.1 0:00.00 eximwrap
6056 mailnull 16 0 7852 2016 1524 D 0.0 0.2 0:00.00 exim
6102 mailnull 15 0 7708 2880 2312 S 0.0 0.3 0:00.00 exim
6122 mailnull 15 0 7588 1688 1228 S 0.0 0.2 0:00.00 exim
6129 mailnull 16 0 7544 1264 828 S 0.0 0.1 0:00.00 exim
6131 mailnull 15 0 7576 1704 1240 S 0.0 0.2 0:00.00 exim
6137 mailnull 15 0 7576 1704 1248 S 0.0 0.2 0:00.00 exim
7182 mailnull 15 0 7576 1788 1320 S 0.0 0.2 0:00.00 exim
7189 mailnull 15 0 7588 1688 1228 S 0.0 0.2 0:00.00 exim
7190 nobody 18 0 1972 900 680 R 0.0 0.1 0:00.01 top
7517 xfs 15 0 3140 1364 752 S 0.0 0.1 0:00.00 xfs
11294 root 22 0 1788 656 492 S 0.0 0.1 0:03.58 dovecot
11295 root 15 0 2272 984 728 S 0.0 0.1 0:03.75 dovecot-auth
11302 dovecot 15 0 3624 1572 1280 S 0.0 0.1 0:00.08 pop3-login
11304 dovecot 15 0 3624 1572 1280 S 0.0 0.1 0:00.27 pop3-login
11305 dovecot 15 0 3824 1860 1400 S 0.0 0.2 0:02.63 pop3-login
11306 dovecot 15 0 3772 1768 1400 S 0.0 0.2 0:00.58 pop3-login
11307 dovecot 15 0 3624 1564 1280 S 0.0 0.1 0:00.09 pop3-login
11308 dovecot 15 0 3632 1588 1284 S 0.0 0.2 0:00.04 imap-login
11309 dovecot 15 0 3776 1768 1396 S 0.0 0.2 0:00.09 imap-login
11310 dovecot 21 0 3776 1828 1396 S 0.0 0.2 0:00.33 imap-login
11311 dovecot 15 0 3636 1568 1284 S 0.0 0.1 0:00.02 imap-login
11312 dovecot 15 0 3764 1768 1396 S 0.0 0.2 0:00.03 imap-login
11477 nobody 15 0 22212 12m 3972 S 0.0 1.2 0:00.58 httpd
11482 root 15 0 5832 3960 916 S 0.0 0.4 0:21.98 cphulkd.pl
11523 nobody 16 0 22804 13m 3992 S 0.0 1.3 0:00.77 httpd
12237 root 15 0 13536 7924 476 S 0.0 0.8 0:00.00 cpdavd
13315 root 15 0 9840 8028 1304 S 0.0 0.8 0:31.51 lfd
13589 root 34 19 3688 1804 872 S 0.0 0.2 0:00.10 cpanellogd
15689 root 18 0 86040 62m 972 S 0.0 6.1 0:12.40 clamd
15976 root 15 0 4128 1048 756 S 0.0 0.1 0:00.00 sshd
16351 root 17 0 2236 1100 936 S 0.0 0.1 0:00.01 mysqld_safe
17414 mysql 15 0 64540 23m 4028 S 0.0 2.3 1:36.66 mysqld
17730 nobody 18 0 21832 12m 3688 S 0.0 1.2 0:00.02 httpd
20290 named 20 0 72744 7464 1928 S 0.0 0.7 1:01.94 named
20388 root 17 0 1996 360 236 S 0.0 0.0 0:00.72 vzctl
20389 root 15 0 2240 1252 1032 S 0.0 0.1 0:00.01 bash
21578 root 15 0 1972 996 772 S 0.0 0.1 0:38.67 top
22369 nobody 15 0 21828 12m 3780 S 0.0 1.2 0:00.05 httpd
22370 nobody 15 0 21828 12m 3696 S 0.0 1.2 0:00.05 httpd
22449 mailnull 15 0 7536 1104 700 S 0.0 0.1 0:00.00 exim
22456 mailnull 15 0 7536 1208 792 S 0.0 0.1 0:01.06 exim
22460 mailnull 21 0 7548 1136 732 S 0.0 0.1 0:00.00 exim
22516 nobody 15 0 22220 12m 3984 S 0.0 1.2 0:00.66 httpd
26474 mailnull 15 0 21692 17m 796 S 0.0 1.7 0:00.04 MailScanner
27830 mailnull 18 0 63992 59m 4516 S 0.0 5.8 0:43.24 MailScanner
28253 root 18 0 17036 8004 1056 S 0.0 0.8 0:01.67 cpsrvd-ssl
30425 root 15 0 3944 1344 1040 S 0.0 0.1 0:00.16 pure-ftpd
30668 nobody 18 0 21832 12m 3692 S 0.0 1.2 0:00.01 httpd
30671 nobody 15 0 21832 12m 3524 S 0.0 1.2 0:00.00 httpd

Looks like the virtuozzo tell() bug, try switching to CURRENT to see if tailwatchd stops taking up all your cpu.

http://forums.cpanel.net/showthread....hlight=pop3#20