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Maybe I am misinterpreting this, but it sounds like each mailbox is assigned to
exactly one realserver?
So you have distributed the mailboxes for load-balancing, but is there any
redundancy if one of the boxes goes down?
> -----Original Message-----
> From:
> lvs-users-bounces+msalists=gmx.net@xxxxxxxxxxxxxxxxxxxxxx
> [mailto:lvs-users-bounces+msalists=gmx.net@xxxxxxxxxxxxxxxxxxxxxx] On Behalf
> Of Scott J. Henson
> Sent: Thursday, December 15, 2005 3:11 PM
> To: LinuxVirtualServer.org users mailing list.
> Subject: Re: Load balanced mail system
>
>
> Pierre Ancelot wrote:
>
> >Hi everyone,
> >
> >I tried to implement a mail system load balanced but i had
> some issues:
> >
> >- The system implement imap amd imaps
> >
> > So in this case, someone creating an imap folder will
> creating it on
> >only one node....
> >
> >- How to update a mail received on one host to every hosts ? using
> >rsync would delete every mail received in the same time on other
> >servers...
> >
> >All this makes me think i should store mails in a mysql cluster
> >database or in a filesystem like AFS for example.
> >
> >Anyone could enlight me on this please ?
> >
> >
> >
> >
>
> Perdition or Courier-Imap. Both of them are/have imap proxies(or
> directors). So what you end up with is one(or more) front
> end proxies
> that send the person to the right machine. It looks something like
> this. Btw, we are moving to such a setup so I don't know how well it
> will be
>
> The connection hits your load balancers(just straight ip_vs).
> Then it hands of the connection to a pool of imap proxies. Then each
> imap proxy figures out which real mail warehouse to send the message
> to(ldap is a good place to store this info cause it too can be load
> balanced, slaves anyway and then no need to load balance the master).
>
> At that point the user does their thing and its all stored on one
> server. But you have many mail boxes distributed across many mail
> warehouses. There is an issue of backups and such for the mail
> warehouse, but this distributes the load so you can serve
> many more mail
> boxes than one server could. I think we are gonna go with
> RAID arrays
> and then hot spare mail warehouse mirrors. If the lead
> warehouse fails
> the backup comes online(through something like heartbeat).
> This should
> be more than enough redundancy for us, but you may want to look into
> other solutions if you want more, aka fiberchannel or some such.
>
> Obviously this setup can get very complexe but become very stable.
> Depending on your application you can throw money at it or
> not even have
> hot spares and trust in your RAID/backups.
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