[Dovecot] size of "m.XXX" in mdbox

[Joan Moreau]

 # doveconf  | grep mdbox
 mdbox_preallocate_space = no
 mdbox_rotate_interval = 0
 mdbox_rotate_size = 2 M


 On Thu, 6 Jan 2011 00:40:44 +0200, Timo Sirainen wrote:

> What does "doveconf | grep mdbox" say? This isn't normal..
>
> On 6.1.2011, at 0.33, Joan Moreau wrote:
>
>> so, why after a dsync from sdbox to mdbox, I have 100 000's of files 
>> of
>> about 20k ? (and not 2MB !) -rw-r--r-- 1 mailusers mail 21K 
>> 2011-01-03
>> 02:47 m.1 -rw-r--r-- 1 mailusers mail 17K 2011-01-03 02:47 m.10
>> -rw-r--r-- 1 mailusers mail 20K 2011-01-03 02:47 m.100 -rw-r--r-- 1
>> mailusers mail 20K 2011-01-03 02:51 m.1000 -rw-r--r-- 1 mailusers 
>> mail
>> 14K 2011-01-03 03:35 m.10000 -rw-r--r-- 1 mailusers mail 19K 
>> 2011-01-03
>> 09:04 m.100000 -rw-r--r-- 1 mailusers mail 174K 2011-01-03 09:04
>> m.100001 -rw-r--r-- 1 mailusers mail 175K 2011-01-03 09:04 m.100002
>> -rw-r--r-- 1 mailusers mail 19K 2011-01-03 09:04 m.100003 -rw-r--r-- 
>> 1
>> mailusers mail 19K 2011-01-03 09:04 m.100004 -rw-r--r-- 1 mailusers
>> mail 19K 2011-01-03 09:04 m.100005 -rw-r--r-- 1 mailusers mail 17K
>> 2011-01-03 09:04 m.100006 -rw-r--r-- 1 mailusers mail 19K 2011-01-03
>> 09:04 m.100007 -rw-r--r-- 1 mailusers mail 18K 2011-01-03 09:04
>> m.100008 -rw-r--r-- 1 mailusers mail 19K 2011-01-03 09:04 m.100009
>> -rw-r--r-- 1 mailusers mail 14K 2011-01-03 03:35 m.10001 -rw-r--r-- 
>> 1
>> mailusers mail 20K 2011-01-03 09:04 m.100010 -rw-r--r-- 1 mailusers
>> mail 19K 2011-01-03 09:04 m.100011 -rw-r--r-- 1 mailusers mail 18K
>> 2011-01-03 09:05 m.100012 -rw-r--r-- 1 mailusers mail 17K 2011-01-03
>> 09:05 m.100013 -rw-r--r-- 1 mailusers mail 20K 2011-01-03 09:05
>> m.100014 -rw-r--r-- 1 mailusers mail 173K 2011-01-03 09:05 m.100015
>> -rw-r--r-- 1 mailusers mail 18K 2011-01-03 09:05 m.100016 -rw-r--r-- 
>> 1
>> mailusers mail 19K 2011-01-03 09:05 m.100017 -rw-r--r-- 1 mailusers
>> mail 18K 2011-01-03 09:05 m.100018 -rw-r--r-- 1 mailusers mail 18K
>> 2011-01-03 09:05 m.100019 -rw-r--r-- 1 mailusers mail 14K 2011-01-03
>> 03:35 m.10002 -rw-r--r-- 1 mailusers mail 177K 2011-01-03 09:05
>> m.100020 -rw-r--r-- 1 mailusers mail 20K 2011-01-03 09:05 m.100021
>> -rw-r--r-- 1 mailusers mail 18K 2011-01-03 09:05 m.100022 -rw-r--r-- 
>> 1
>> mailusers mail 52K 2011-01-03 09:05 m.100023 -rw-r--r-- 1 mailusers
>> mail 18K 2011-01-03 09:05 m.100024 -rw-r--r-- 1 mailusers mail 177K
>> 2011-01-03 09:05 m.100025 -rw-r--r-- 1 mailusers mail 19K 2011-01-03
>> 09:05 m.100026 On Thu, 6 Jan 2011 00:15:30 +0200, Timo Sirainen 
>> wrote:
>>
>>> On 6.1.2011, at 0.07, Joan Moreau wrote:
>>>
>>>> How to tune the size of each "m.xxx" file in mdbox format , in
>>>> order to optimize the ratio size/number of files ? (I can see for
>>>> instance more than 100 000 files in one directory due to very 
>>>> large
>>>> mailbox size)
>>> mdbox_rotate_size setting sets the max size of one mdbox file.
>>> There's really no ratio setting.. It would be difficult since as 
>>> more
>>> messages get added more files would have to be merged, which would
>>> generate extra disk I/O, and typically people care about disk I/O
>>> rather than the inode count.
>>>
>>>> If such parameter exists, what is the typical value ?
>>> Default is 2 MB files.