imapsync very poor performance

[Franz Skale]

Check for hanging threads.
Also check ,that your sysctl.conf maxfilenr is big enough.
Change your init script accordingly. (ulimit -n 4096 before the start
option)

Check sysctl.conf:
fs.inotify.max_user_instances = 4096
fs.file-max = 2000000

do: sysctl -p after changing the sysctl.conf

Check the dovecot error log. /var/log/dovecot-error.log (on debian systems)


Rgds


Franz




Am 02.12.13 17:01, schrieb Christian Hügel:
> Hi Franz,
>
> with those options dovecot specially.
>
>> login_max_processes_count = 1024
>> login_max_connections = 2048
>
> the dovecot server hangs and isn´t accessible anymore.
>
>
> Christian
>
> Am 02-12-2013 16:47, schrieb Franz Skale:
>> Check your dovecot settings.
>> Also, the the dovecot error log.
>> Typical settings of a busy host:
>>
>> mail_max_userip_connections = 100
>> login_max_processes_count = 1024
>> login_max_connections = 2048
>> In the init script use ulimit -n 4096
>>
>> Then try again.
>>
>> Rgds.
>>
>> Franz
>>
>>
>>
>> Am 02.12.13 15:41, schrieb Christian Hügel:
>>> i,
>>>
>>> I´m running imapsync-1.569-1.el6.noarch on a Centos 6.5 x64 system
>>> with 8GB RAM and a dual 3Ghz AMD cpu. The sync runs on the "target
>>> server and the source server is a dovecot 1.2.1
>>> Here are some stats:
>>>
>>> 0.01 msgs/s 63.780 KiB/s ETA: Mon Dec 2 22:31:21 2013 28528 s 328 msgs
>>> left
>>> 0.01 msgs/s 65.135 KiB/s ETA: Tue Dec 3 01:17:36 2013 38356 s 327 msgs
>>> left
>>> 0.01 msgs/s 65.076 KiB/s ETA: Mon Dec 2 21:44:20 2013 25560 s 326 msgs
>>> left
>>> 0.01 msgs/s 65.238 KiB/s ETA: Mon Dec 2 23:08:44 2013 30484 s 325 msgs
>>> left
>>> 0.01 msgs/s 65.181 KiB/s ETA: Mon Dec 2 21:26:25 2013 24344 s 324 msgs
>>> left
>>> 0.02 msgs/s 65.122 KiB/s ETA: Mon Dec 2 20:18:12 2013 20251 s 323 msgs
>>> left
>>> 0.02 msgs/s 65.235 KiB/s ETA: Mon Dec 2 19:46:36 2013 18332 s 322 msgs
>>> left
>>>
>>> and the cpu is during the sync at 100% The size of the mails are
>>> normal no attachments so I realy don´t know where´s the issue here.
>>> The size of the mailbox is only 300MB but I have a couple of huge
>>> mailboxes (>17GB). With this speed it´s quite impossible to migrate my
>>> mailboxes to the new kolab 3.1 server
>>>
>>> Can you please help me out with this issue? Thank you
>>>
>>> Christian
>
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