Recomendations for a Migration of a Cyrus mailStore with 70K users.

[Nestor A Diaz]

Hello Cyrus People.

I have been always a proud user of the cyrus email system, currently my 
larger cyrus installation is about 70K users, which have been working 
fine, however i need to make some adjustems to improve the resposiviness 
of the mailstore.

At the begining i use only a default mailstore, on a ext3 formatted 
filesystem over a raid 10 / LVM, it works fine, however when it reaches 
the 32768 directories, (a limitation of ext3) i have to create another 
partition, and then another one, so i have currently 3 partitions in total.

Having defined some criteria in order to group every user into a 
partition i will like some recomendations, taking in mind the current 
cyrus server tools which i currently don't know what are their current 
capabilities, my plan is to forget using cyrus partitions, and instead 
using LVM partitions and the propper links to the physical partitions 
from the logical one.

So i currently have:

partition-default : 30K users
partition-alt1: 20K users
partition-alt2 : 20K users.

and then i will like to have just one partition:

partition-default ext4 formatted with links to physical partitions based 
on the first letter [a-z] of the user.

I think LVM is a great advantage, and in some way aliviate the need for 
cyrus partitions, i it will lead me deal with the grow of a partition 
and data administration so easy without too much downtime.

So, it means that accordingly to this stragegy which seems to be the 
most simple for me, what would be the best technical path to accomplish 
a good migration ? allowusermoves: yes option and renamemailbox is 
enoguth to do this task ? what if i want to do this online ? can i ? how 
? is there any script that will help me do that ?

Any suggestions or migration histories are welcome !

What about murder / perdition ? they make any sense in this configuration ?

Keep this good work !

Slds.

--
Nestor A. Diaz
Ingeniero de Sistemas
Tel. +57 1-485-3020 x 211
Cel. +57 316-227-3593
Tel. SIP: sip:211 at tiendalinux.com
Email/MSN: nestor at tiendalinux.com
http://www.tiendalinux.com/
Bogota, Colombia