[Dovecot] size of "m.XXX" in mdbox
Joan Moreau
jom at grosjo.net
Thu Jan 6 00:33:57 EET 2011
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.
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