Hi,
try to start dovecot with "ulimits -u 10240 -n 40000" and increase the
value in /proc/sys/fs/inotify/max_user_instances around to 1024.
I also suggest to use XFS instead of ext4, for example after a crash XFS
is immediately available.
Ciao
Il 05/11/2014 16:07, [email protected] ha scritto:
Hi,
Since few days I noticed very high load on my mailserver (Centos 6.6 64bit, 8
GB RAM, 2 x CPU 3.00GHz
I am using Dovecot + Postfix + Roundcube + Nginx.
I have about 10000 users.
Spool is on network attached storage (Coraid).
File system is ext4 (mounted with noatime).
Problem appears almost every morning (while load is normal during afternoon).
I suspect that this can be related to some user that have so many messages in
his mailbox.
How can I troubleshoot this?
Here some messages that I got in maillog:
Warning: Maildir: Scanning /var/spool/pop/domains/xxxx.it/YYYYYYYYY/Maildir/new
took 71 seconds (1 readdir()s, 1 rename()s to cur/)
Warning: Maildir /var/spool/pop/domains/zzzz/WWWWWWWWWWWW/Maildir/.Trash:
Synchronization took 74 seconds (5 new msgs, 0 flag change attempts, 0 expunge
attempts)
dovecot: imap([email protected]): Warning: Inotify instance limit for user 89 (UID
postfix) exceeded, disabling. Increase /proc/sys/fs/inotify/max_user_instances
tail: inotify cannot be used, reverting to polling: Too many open files
My relevant dovecot conf:
mail_location = maildir:/coraid-s2l2/domains
namespace {
type = private
separator = .
prefix = INBOX.
inbox = yes
}
mail_uid = 89
mail_gid = 89
mail_fsync = never
first_valid_uid = 89
first_valid_gid = 89
maildir_very_dirty_syncs = yes
mbox_write_locks = fcntl
thank you very much!
