High Load average on NFS Spool - v.2.1.15 & 2.2.13

[admin]

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 Solutionsinfo at awib.it
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