[Dovecot] Dovecot and SATA Backend

[Robert Schetterer]

alex handle schrieb:
>> Extra question, what is the better : iSCSI SATA backend or NFS share ?
>> NFS share is more convenient to have a failover server.
> 
> Everyone wants to use nfs for mailstorage, because it is convenient,
> but nfs is the wrong storage model for mail.
> NFS shines on big files but metadata performance is low, too much overhead!
> 
> We currently have a mailcluster with 10000 mailboxes and the data ist
> stored on a netapp storage.
> If you have a Mailbox with more then 1000 mails, it gets slow over nfs.
> 
> Our new architecuture will look like this:
> 
> No NFS, no iSCSI we use DAS.
> There will be multiple dedicated mailbox server in pairs with a small
> postfix instance and dovecot.
> These Servers will only be used for delivering/IMAP/POP3.
> To get HA we use DRBD und Heartbeat in active/passive setup.
> In the front there will be a IMAP/POP3 proxy to direct the user to his
> mailbox server.
> 
> This setup scales and is cheap, you only have to find a way to
> distribute the mailboxes around all mailbox servers.
> 
> I think rackspace email uses a similar setup with drbd and dovecot.

sorry for the stupid question what is "DAS"
do you have a link etc for it, to get more info

-- 
Best Regards

MfG Robert Schetterer

Germany/Munich/Bavaria