Recomendations for a 15000 Cyrus Mailboxes

[Timo Schoeler]

On Tue, 10 Apr 2007 06:56:43 -0500
"Nestor A. Diaz" <nestor at tiendalinux.com> wrote:

> Hello People,
> 
> I am a proud cyrus user and fan, right know i need o implement a 15K 
> users cyrus mailstore, since i have been using cyrus for an average
> 400 users mailstore, i will like to hear comments for setting up a
> cyrus for a 15K users.
> 
> I currently have a  ' postfix / postgresql / cyrus-sasl / cyrus ' 
> production server working for more than two years without problems,
> and i am going to replicate the same configuracion, however since i
> am going to have a  huge  space  for mail  and people are going to
> use a lot of space, aprox. 50 MB per user, i will like to hear some
> comments about what should be the best  (cyrus / pop3 / imapd)
> configuration, i have read on the mail list some configuration that
> fastmail.fm use, including pop3, imap proxies and multiple instances
> of cyrus, but i like to see more comments about that.
> 
> These are the plans: (comments on every number will be apreciated)
> 
>    1. Linux LVM over a 600 GB RAID 10 ( 4 x 300 GB)
>    2. Which filesystem seems to be the better ? ext3 ? xfs ?
> reiserfs ?

Do NEVER use XFS on GNU/Linux. (C)XFS is a brilliant FS on sgi's IRIX
machines, I never lost even a single in more than ten years.

On GNU/Linux the implementation totally sucks. I'll stop my rant on
GNU/Linux now ;)

My guess: ext3. ReiferFS has some very annoying weaknesses that may
affect you.

Best: ZFS on Solaris ;)

>    3. Which options to format the filesystem ? acording to the chosed
>       filesystem
>    4. Which pop3 / imap proxy to use ?
>    5. Single instance or multiple instances of cyrus ? taking in mind
>       that there should be the option to recover a mailbox or some
> mail of a mailbox without having to shut down the whole cyrus system.
>    6. Best way to perform backups ? LVM snapshots ? shutting down some
>       cyrus partitions ? RAID10 hot swap ?
>    7. Any other suggestion will be welcome.
> 
> Thanks a lot !!
> 
> Slds.
> 
> -- 
> Nestor A. Diaz
> Ingeniero de Sistemas
> Tel. +57 1-600-5490 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 
> 
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