AW: [ext] dovecot/imap hohe io load

[Simon Sutter]

>> Hallo Ralf, hallo Hajo
>> 
>> Danke vielmals mit dem Tipp für das Log.
>> Ich habe es nun eingeschalten und heute war es wieder so weit, dass der Server wieder ins Stocken kam.
>> Laut atop ging das Ganze von 08:07 Uhr bis 08:17 Uhr.
>
>In dem Zeitraum sieht man:
>
>Nov  8 08:09:24 301 dovecot: service=imap, user=[], ip=[]. Warning: Transaction log file /var/qmail/mailnames/account/user/Maildir/dovecot.index.log was locked for 63 >seconds (appending) ...
>Nov  8 08:09:24 301 dovecot: service=imap, user=[], ip=[]. Disconnected in APPEND (1 msgs, 0 secs, 0/12517 bytes) rcvd=178285, sent=10232103 ...
>Nov  8 08:16:14 301 dovecot: service=lda, user=[], ip=[]. Warning: Transaction log file /var/qmail/mailnames/account/user/Maildir/dovecot.index.log was locked for 42 >seconds (Mailbox was synchronized) ...
>Nov  8 08:16:25 301 dovecot: service=lda, user=[], ip=[]. Warning: Maildir /var/qmail/mailnames/account/user/Maildir: Synchronization took 41 seconds (1 new msgs, 0 flag >change attempts, 0 expunge attempts) Nov  8 08:16:25 301 dovecot: service=lda, user=[], ip=[]. Warning: Maildir /var/qmail/mailnames/account/user/Maildir: >Synchronization took 41 seconds (1 new msgs, 0 flag change attempts, 0 expunge attempts) Nov  8 08:16:25 301 dovecot: service=lda, user=[], ip=[]. Warning: Maildir >/var/qmail/mailnames/account/user/Maildir: Synchronization took 41 seconds (1 new msgs, 0 flag change attempts, 0 expunge attempts) Nov  8 08:16:25 301 dovecot: >service=lda, user=[], ip=[]. Warning: Maildir /var/qmail/mailnames/account/user/Maildir: Synchronization took 41 seconds (1 new msgs, 0 flag change attempts, 0 expunge >attempts) Nov  8 08:16:25 301 dovecot: service=lda, user=[], ip=[]. Warning: Maildir /var/qmail/mailnames/account/user/Maildir: Synchronization took 41 seconds (1 new >msgs, 0 flag change attempts, 0 expunge attempts) Nov  8 08:16:25 301 dovecot: service=lda, user=[], ip=[]. Warning: Maildir /var/qmail/mailnames/account/user/Maildir: >Synchronization took 41 seconds (1 new msgs, 0 flag change attempts, 0 expunge attempts) Nov  8 08:16:25 301 dovecot: service=lda, user=[], ip=[]. Warning: Maildir >/var/qmail/mailnames/account/user/Maildir: Synchronization took 41 seconds (1 new msgs, 0 flag change attempts, 0 expunge attempts) ...
>Nov  8 08:16:28 301 dovecot: service=lda, user=[], ip=[]. Warning: Maildir /var/qmail/mailnames/account/user/Maildir: Synchronization took 42 seconds (1 new msgs, 0 flag >change attempts, 0 expunge attempts)
>
>Sieht für mich so aus als wäre da massiv Disk IO mit massivem IO wait!

Also denkst du es liegt nicht an dovecot selbst, sondern etwas anderes verursacht diese IO wait und das summiert sich dann welches dovecot/imap als den Verursacher darstellt?