Thank you both, and sorry for not noticing Jonathan's recent post. I'll read a bit and get back.
Omar On Thu, Jan 13, 2011 at 8:03 AM, Jonathan Tripathy <jon...@abpni.co.uk> wrote: > > > On 13/01/11 05:42, Jonathan Tripathy wrote: >> >> On 13/01/11 05:36, Jaques Cochet wrote: >>> >>> Hi >>> >>> I'm working on a mail system design for an ISP that includes hosting >>> of multiple virtual domains managed by this ISP (300.000 mailbox). HA >>> and performance are both important concerns for the client, so I have >>> at least 2 of every server (webmail, pop3, imap, relay and smtp >>> (postfix)) for which i'm using either L4 or MX record load >>> balancing/HA. >>> I hate the idea of distributing mailboxes among servers and I'm trying >>> to go for a single mailstore that is accessible by POP3/IMAP servers >>> and delivery SMTP servers and I'm planning to use a SAN for this. The >>> basic idea is to share the mailstore between SMTP servers (clustered >>> storage using GFS maybe) and make the same mailstore available to >>> POP/IMAP server using NFS. Am I on the right track here? >>> >>> Jaques >> >> Jaques, >> >> I asked these very questions yesterday on this list, so you may find that >> info useful :) (Search for "Network Ideas" and look at recent posts, as my >> inital posts had setup ideas that were too complicated) >> >> Basically, what I'm going to do is have have 4 servers in total: >> >> 2 X "Mail Servers" which will run Postfix and Dovecot on the same box >> 2 X NFS Servers using DRBD and Linux-HA. The 2-server cluster will export >> an NFS share to both mails servers >> >> I'll also have additional incoming mails servers which will do spam/virus >> filtering (no mail store hence no connection to NFS cluster). Reading >> around, Postfix and Dovecot work very well in single mail-store >> environments. I don't feel my requirements require me to separate Dovecot >> and Postfix. I will use pfsense as a load balancer though so both mail >> servers can be used at the same time. >> >> I'm still debating between the above mentioned NFS/DRBD cluster and a >> GlusterFS cluster. Reading around online, many people have had performance >> issues with GlusterFS (As late as Sept 2010) so I'm not sure this is a good >> idea. >> >> This setup is just in planning, but its the latest idea I have. >> >> Cheers > > I should probably add that in my current idea, my database servers are also > separate in a DRBD/Linux-HA fashion. This means that both main mail servers > (which run postfix and dovecot), as well as the inbound mx servers (which > run postfix, spamassian and amavisd) can use it for lookups. I havn't > thought this far ahead yet, but I'm sure I can get my inbound mx servers to > look up the database to reject mail which the whole system doesn't control, > yet still use transport maps to send to another server... >
