> Hi Dovecot community,
>
> We're looking at running multiple Dovecot backend servers in parallel, all
> using the same shared NFSv4.1 mount to store mailboxes in the maildir
> format.
>
Just my experience, you can use multi-IMAP proxy in front of the real IMAP
server which has powerful hardware like strong CPU, big ram, fast disk and
high throughput networks.
b/c IMAP proxy can offload the clients' connections, and reduce the
connection
number to backend server (the real IMAP server) via long-live
connections, it should optimize a lot on performance of the whole
cluster.
Thanks.
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