Replication failed 3.0.5 -> 3.0.13

[Andrzej Kwiatkowski]

W dniu 22.04.2020 o 10:19, Olaf Frączyk pisze:
> On 2020-04-22 09:16, Andrzej Kwiatkowski wrote:
>> W dniu 20.04.2020 o 16:11, Olaf Frączyk pisze:
>>> Hi,
>>>
>>> I'm running 3.0.5.
>>>
>>> I want to migrate to a new machine. I set up cyrus-imapd 3.0.13.
>>>
>>> The replication started but it didn't transfer all mails.
>>>
>>> The store isn't big 44GB, transferred was about 24 GB.
>>>
>>> In the logs I see:
>>>
>> Olaf,
>>
>> Do you install 3.0.13 on vm or bare-metal ?
>>
>> Regards
>> AK
> 
> I have it installed in VM - CentOS 7, now 8. This setup worked OK for 
> many years. But I have only a few users, just with big mailboxes.
> 
> On SAS drives it works fine. The only longlock I saw was during the 
> replication - I suppose transferring 20.000 big messages at once per 
> mailbox could cause it. But in normal usage I don't see it.
> 
> The cause of my problem was my ignorance regarding how rolling 
> replication works in cyrus. It works OK now :)
> 
> Regards,
> 
> Olaf
> 
Ok.

I was asking because of problem with low entropy on VM-s causing
performance issues with big installations.

I've also noticed that replication documentation is a bit tricky,
and not every procedure/case is well documented.

Regards
AK