High Load average on NFS Spool - v.2.1.15 & 2.2.13
Nick Edwards
nick.z.edwards at gmail.com
Tue Dec 18 23:03:00 EET 2018
dont play net cop here
but since you want to try force your opinion down others throats heres
one for you, if you want to try dictate to someone to bottom post to
suite you how about you use proper net etiquette yourself and TRIM
your posts
On 12/19/18, admin <admin at awib.it> wrote:
> Am Dienstag, den 18.12.2018, 14:26 -0500 schrieb Albert E. Whale, CEH
> CHS CISA CISSP:
>> I have, but I will be happy to review it once again.
>>
>>
>> On 12/18/18 2:14 PM, admin wrote:
>>
>>
>>
>> >
>> > Am Dienstag, den 18.12.2018, 14:06 -0500 schrieb Albert E.
>> > Whale, CEH CHS CISA CISSP:
>> >
>> > > I have two servers pointing to an NFS mounted mail spool
>> > > with
>> > > dovecot. Since I recently switched from using Dovecot
>> > > v1.X, I
>> > > have been experiencing high CPU use with the two
>> > > Dovecot
>> > > servers. I am not certain why they are not well
>> > > behaved.
>> > > Here is the configuration information.
>> > >
>> > >
>> > >
>> > > This configuration is currently running at a load average
>> > > of
>> > > 17.
>> > >
>> > >
>> > > /usr/sbin/dovecot -n
>> > >
>> > > # 2.1.15: /etc/dovecot/dovecot.conf
>> > >
>> > > # OS: Linux 3.10.54-server-2.mga3 i686 Mageia 3
>> > >
>> > > base_dir = /var/run/dovecot/
>> > >
>> > > disable_plaintext_auth = no
>> > >
>> > > lock_method = dotlock
>> > >
>> > > login_greeting = SpamZapper Email ready.
>> > >
>> > > login_log_format_elements = user=<%u> method=%m rip=%r
>> > > lip=%l %c
>> > >
>> > > mail_debug = yes
>> > >
>> > > mail_fsync = always
>> > >
>> > > mail_location = maildir:~/Maildir
>> > >
>> > > mail_nfs_index = yes
>> > >
>> > > mail_nfs_storage = yes
>> > >
>> > > mail_privileged_group = mail
>> > >
>> > > mbox_lock_timeout = 15 mins
>> > >
>> > > mmap_disable = yes
>> > >
>> > > passdb {
>> > >
>> > > driver = pam
>> > >
>> > > }
>> > >
>> > > protocols = imap pop3
>> > >
>> > > service anvil {
>> > >
>> > > client_limit = 203
>> > >
>> > > process_limit = 1
>> > >
>> > > }
>> > >
>> > > service auth {
>> > >
>> > > user = root
>> > >
>> > > }
>> > >
>> > > service imap-login {
>> > >
>> > > chroot = login
>> > >
>> > > client_limit = 10
>> > >
>> > > user = dovecot
>> > >
>> > > vsz_limit = 256 M
>> > >
>> > > }
>> > >
>> > > service pop3-login {
>> > >
>> > > chroot = login
>> > >
>> > > client_limit = 20
>> > >
>> > > user = dovecot
>> > >
>> > > }
>> > >
>> > > ssl = no
>> > >
>> > > syslog_facility = local2
>> > >
>> > > userdb {
>> > >
>> > > driver = passwd
>> > >
>> > > }
>> > >
>> > > verbose_proctitle = yes
>> > >
>> > > protocol pop3 {
>> > >
>> > > mail_max_userip_connections = 20
>> > >
>> > > pop3_logout_format = top=%t/%p, retr=%r/%b,
>> > > del=%d/%m,
>> > > size=%s
>> > >
>> > > pop3_uidl_format = %08Xv%08Xu
>> > >
>> > > }
>> > >
>> > > protocol lda {
>> > >
>> > > postmaster_address = postmaster at example.com
>> > >
>> > > }
>> > >
>> > > protocol imap {
>> > >
>> > > mail_max_userip_connections = 10
>> > >
>> > > }
>> > >
>> > >
>> > > And the other server which is currently running with a
>> > > load
>> > > average of 10.
>> > > dovecot -n
>> > >
>> > > # 2.2.13: /etc/dovecot/dovecot.conf
>> > >
>> > > doveconf: Warning: service anvil { client_limit=100 }
>> > > is lower
>> > > than required under max. load (303)
>> > >
>> > > # OS: Linux 4.1.15-server-2.mga5 x86_64 Mageia 4
>> > >
>> > > base_dir = /var/run/dovecot/
>> > >
>> > > disable_plaintext_auth = no
>> > >
>> > > listen = *
>> > >
>> > > lock_method = dotlock
>> > >
>> > > login_greeting = SpamZapper Email ready.
>> > >
>> > > login_log_format_elements = user=<%u> method=%m rip=%r
>> > > lip=%l %c
>> > >
>> > > mail_fsync = always
>> > >
>> > > mail_location = maildir:~/Maildir
>> > >
>> > > mail_nfs_index = yes
>> > >
>> > > mail_nfs_storage = yes
>> > >
>> > > mail_privileged_group = mail
>> > >
>> > > mmap_disable = yes
>> > >
>> > > passdb {
>> > >
>> > > driver = pam
>> > >
>> > > }
>> > >
>> > > protocols = imap pop3
>> > >
>> > > service anvil {
>> > >
>> > > client_limit = 100
>> > >
>> > > process_limit = 1
>> > >
>> > > }
>> > >
>> > > service auth {
>> > >
>> > > user = root
>> > >
>> > > }
>> > >
>> > > service imap-login {
>> > >
>> > > chroot = login
>> > >
>> > > client_limit = 48
>> > >
>> > > user = dovecot
>> > >
>> > > vsz_limit = 256 M
>> > >
>> > > }
>> > >
>> > > service pop3-login {
>> > >
>> > > chroot = login
>> > >
>> > > client_limit = 50
>> > >
>> > > user = dovecot
>> > >
>> > > }
>> > >
>> > > ssl = no
>> > >
>> > > syslog_facility = local2
>> > >
>> > > userdb {
>> > >
>> > > driver = passwd
>> > >
>> > > }
>> > >
>> > > verbose_proctitle = yes
>> > >
>> > > protocol pop3 {
>> > >
>> > > mail_max_userip_connections = 50
>> > >
>> > > pop3_logout_format = top=%t/%p, retr=%r/%b,
>> > > del=%d/%m,
>> > > size=%s
>> > >
>> > > pop3_uidl_format = %08Xv%08Xu
>> > >
>> > > }
>> > >
>> > > protocol lda {
>> > >
>> > > postmaster_address = postmaster at example.com
>> > >
>> > > }
>> > >
>> > > protocol imap {
>> > >
>> > > mail_max_userip_connections = 40
>> > >
>> > > }
>> > >
>> > >
>> > > Can you please offer a suggestion on what is happening?
>> > > The
>> > > timeouts to the imap server are frequent due to the
>> > > load
>> > > average.
>> > > Thank you.
>> > >
>> > >
>> > > --
>> > >
>> > > --
>> > >
>> > > --
>> > >
>> > >
>> > >
>> > > Albert E. Whale, CEH CHS CISA CISSP
>> > >
>> > > President - Chief Info Security Officer
>> > >
>> > > IT Security, Inc. - A Service
>> > > Disabled Veteran Owned Company - (SDVOSB)
>> > >
>> > > HUBZone Certified
>> > >
>> > > LinkedIn Profile
>> > >
>> > >
>> > >
>> > >
>> > >
>> > > Phone: 412-515-3010 | Email:
>> > > Albert.Whale at IT-Security-inc.com
>> > >
>> > > Cell: 412-889-6870
>> > >
>> > >
>> > >
>> > >
>> > >
>> >
>> >
>> >
>> >
>> > Did you have a look at https://wiki2.dovecot.org/NFS
>> > ?
>> >
>> >
>> >
>> > --
>> >
>> > awib IT Solutions
>> > info at awib.it
>> >
>> >
>> >
>>
>> --
>>
>> --
>>
>> --
>>
>>
>>
>> Albert E. Whale, CEH CHS CISA CISSP
>>
>> President - Chief Info Security Officer
>>
>> IT Security, Inc. - A
>> Service Disabled Veteran Owned Company - (SDVOSB)
>>
>> HUBZone Certified
>>
>> LinkedIn
>> Profile
>>
>>
>>
>>
>>
>> Phone: 412-515-3010 | Email: Albert.Whale at IT-Security-inc.com
>>
>> Cell: 412-889-6870
>>
>>
>>
>>
>>
>>
>
> Please try to bottom post.
> Would be interesting to know what causes the load (which is not
> restricted to be caused by CPU only!):
>
> https://unix.stackexchange.com/a/130970
>
> Might NFS be the culprit?
> https://serverfault.com/a/120874/229525
>
> -M--
> awib IT Solutionsinfo at awib.it
>
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