[ext] dovecot/imap hohe io load

[Michael Grundmann]

Hi,

mach mal dabei ein iotop - das geht jetzt auch wieder ;)
Da siehst du die Last

Gruß Michael

Wenn du verstehst, was du tust, wirst du nichts lernen

Am 08.11.18 um 17:34 schrieb 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?
> 	
>