Size of partition.

Bron Gondwana brong at
Wed May 2 05:33:59 EDT 2018

On Tue, 1 May 2018, at 04:12, Albert Shih wrote:
> Le 30/04/2018 à 08:30:44+0200, Robert Stepanek a écrit
>> On Fri, Apr 27, 2018, at 15:48, Albert Shih wrote:
>>> I activated squatter but put the index not on ssd. The index
>>> created by squatter are (in my case) about 5-8% of the size of
>>> the mailbox.
>>> But I got lot of « conversation »  index. What's the purpose
>>> of those « conversations »  ?
>> conversations.db initially was used to keep an index of email
>> conversations (e.g. the threaded views typically found in most email>> readers nowadays). But today it also helps for most use-cases where
>> we need to keep track of messages across mailboxes (e.g. if you have>> two copies of an email in two mailboxes, you'll see that reflected in>> conversations.db). It confusingly is still named conversations.db for>> historic reasons. But for any recent (v3) Cyrus IMAP installation,
>> including Xapian and JMAP, it's a very critical piece in the puzzle.> 
> Ok. Thanks you.
> Still one question, I see in the configuration file
>   conversations_expire_days : 90
> why do I need to keep those information during 90 days ?  For
> example what> would be the impact if I say
>   conversations_expire_days : 7

The bit which is expired is the mapping from message-id(s) to
conversation id.  If you set it to 7 days, then if you receive a reply
to an existing message more than a week later, it won't detect that they
are related.


  Bron Gondwana, CEO, FastMail Pty Ltd
  brong at

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