[Dovecot] How can we horizontally scale Dovecot across multiple servers?
Robert Schetterer
robert at schetterer.org
Mon Oct 31 14:33:22 EET 2011
Am 31.10.2011 12:28, schrieb Felipe Scarel:
> Quick question about the usage of DRBD: I'm thinking of a setup on my
> organization here (15k+ users, 4TB of email data), but I'm holding back
> on the clusterization due to the high volume of data.
>
> Using DRBD would implicate mirroring those 4TB of data across all
> cluster nodes? If yes, I might go with a SAN-based solution, though I
> haven't studied much about that setup yet (the other sysadm
> administrates the VMs and SAN, gotta ask him a few questions).
i wouldnt do that with drbd
as such big setup , there should be enough money using better choices
>
> On Mon, Oct 31, 2011 at 08:00, Robert Schetterer <robert at schetterer.org
> <mailto:robert at schetterer.org>> wrote:
>
> Am 31.10.2011 10:43, schrieb Arlin:
> > Hi Robert,
> >
> > Thanks for the reply. We are upgrading Dovecot to v2.0.15 and other
> > component's to the latest version. In that case, can we use san
> for storage
> > or are you recommending that drbd with ocfs2 is the best way to
> attain the
> > horizontal scalability for the mail storage?
>
> Hi Arlin, there is no best way, you should choose
> whatever fits best to your needs an haves
> so it depends on many stuff ( i.e at last finance, network, manpower,
> knowledge) etc
>
> So all i can say iam just using a loadbalanced cluster setup with drbd
> ocfs2 maildir dovecot postfix mysql clamav spamassassin on ubuntu lucid
> lts with 3000 Mailboxes without any big Problems yet
> but i can imagine that a professional SAN might be better in performance
> but there is a lot other other questions left , i.e maildir must not be
> the best solution for mailbox format etc
>
> cluster setups with lots of mailboxes are complex
> in many ways, if you planning a real big mailservice
> you should ask more here on this list for existing other setups and
> choose i.e
> Timo and/or others for professional and paid advice and work
>
>
> >
> > Thanks,
> > Arlin
> >
> > -----Original Message-----
> > From: dovecot-bounces at dovecot.org
> <mailto:dovecot-bounces at dovecot.org>
> [mailto:dovecot-bounces at dovecot.org
> <mailto:dovecot-bounces at dovecot.org>] On
> > Behalf Of Robert Schetterer
> > Sent: 31 October 2011 14:26
> > To: dovecot at dovecot.org <mailto:dovecot at dovecot.org>
> > Subject: Re: [Dovecot] How can we horizontally scale Dovecot
> across multiple
> > servers?
> >
> > Am 31.10.2011 09:47, schrieb Arlin:
> >> Could anyone please respond to this query. Thank you!
> >
> > you may use loadbalancers i.e (keepalived etc) and/or
> >
> > http://wiki2.dovecot.org/FeatLoginProxy
> > http://wiki2.dovecot.org/PasswordDatabase/ExtraFields/Proxy
> >
> > look the list for cluster setups etc
> >
> > reading your former post
> > you want to use many outdated prog versions dont do that a san for
> storage
> > might be a good choice some of the list use drbd with ocfs2 and other
> > cluster filesystems
> >
> >>
> >>
> >>
> >> From: Arlin [mailto:arlin at mvs.us <mailto:arlin at mvs.us>]
> >> Sent: 28 October 2011 17:06
> >> To: 'dovecot at dovecot.org <mailto:dovecot at dovecot.org>'
> >> Subject: How can we horizontally scale Dovecot across multiple
> servers?
> >>
> >>
> >>
> >> Hi,
> >>
> >>
> >>
> >> How can we horizontally scale Dovecot across multiple servers? Do we
> >> require to install independent instances of Dovecot on each server?
> >>
> >>
> >>
> >> We are planning to use a NAS/SAN device using ZFS or EFS for email
> > storage.
> >> Each logical unit will be of 10TB and similarly as the no: of user
> >> increases we are planning to add multiple 10TB units.
> >>
> >> In this case how we can manage the email storage on multiple volumes
> >> from Dovecot.
> >>
> >>
> >>
> >> The configuration of our existing system is:-
> >>
> >>
> >>
> >> Dovecot 1.0.15 / Maildirs
> >>
> >> Postfix 2.5.5
> >>
> >> Debian 5.0.9 (Lenny)
> >>
> >> MySQL 5.0.15
> >>
> >>
> >>
> >> Please advise.
> >>
> >>
> >>
> >> Thanks in advance.
> >>
> >>
> >>
> >> Creative Regards,
> >>
> >> Arlin
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> > --
> > Best Regards
> >
> > MfG Robert Schetterer
> >
> > Germany/Munich/Bavaria
> >
>
>
> --
> Best Regards
>
> MfG Robert Schetterer
>
> Germany/Munich/Bavaria
>
>
--
Best Regards
MfG Robert Schetterer
Germany/Munich/Bavaria
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