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

[Joan Moreau]

It looks like each of them has one or more messages. 

Looks like if
the msg is too big, (i.e. above the 20k or so), there is only one
message in the m.xxx 

regarding lda, my "mdbox" folders are just a
mirror via dsync, no lda incoming in the mdbox folders 

On Thu, 6 Jan
2011 00:51:00 +0200, Timo Sirainen wrote: 

> That is weird then.. Have
you looked inside these files? Does each one have only a single mail or
are there a couple? What Dovecot version? These files were created by
dsync I guess? What about the last few files that (I assume) are created
by dovecot-lda, are they any bigger?
> 
> On 6.1.2011, at 0.47, Joan
Moreau wrote:
> 
>> # 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.