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

[Joan Moreau]

 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.