[Linux-cluster] Re: E-Mail Cluster

[Nicholas Anderson]

Hi Jan,

I'm searching in google how to convert from mbox to maildir using 
sendmail/procmail .... i have 3000+ users and something like 70GB of 
emails and  I'll have to test it very well before doing in the 
production server ....

As soon as i get this things working fine, i'll try gfs and the other 
cluster stuff .....
I'm thinking on doing something like you said ... 3 nodes running 
imap/pop/smtp sharing one filesystem probably with gfs where user data 
will be stored.....
I was running slackware but now I'm thinking about something like redhat 
or centos (will depend on our budget :-)  ) to the nodes ....
It'll be easier to keep them up2dated :-)

Any new tips are welcome :-)

thanks,

Nick


Jan-Frode Myklebust wrote:
> On 2006-07-31, Nicholas Anderson <nicholas at fiocruz.br> wrote:
>   
> For clustering, I think it would be better to use Maildir-format
> for the mailboxes. Then you'll avoid any locking problems on the
> mailboxes. New messages can be delivered on one machine while other
> messages in the same mail-folder is being deleted on another machine.
>
> If your users are only accessing their email by pop/imap, moving to 
> Maildir shouldn't be any issue.
>   
> NFS is very single-point-of-failure.. so definately a clusterfs/GFS.
> If you can move to Maildir, you should be able to run any number of
> servers where each server is running all services (imap, pop and smtp), 
> and incoming traffic is routed to a random server trough f.ex. round
> robin dns.
>
> To handle single-node downtime/crash, you'll just need to move the
> ip-address to an available node. Easily achivable trough f.ex. 
> heartbeat from linux-ha.org, and probably also RH Cluster Suite..
>
>
>   -jf
>
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-- 
Nicholas Anderson
Administrador de Sistemas Unix
LPIC-1 Certified
Rede Fiocruz
e-mail: nicholas at fiocruz.br