dovecot - Dec 2012 - 2 node dovecot

Hi,

We run dovecot 2.1 on 2 nodes with shared nfs storage. Index files are
kept on local disk.
Second node is usually used only for email snapshots access. If
primary node fails it is configured to
take place of the primary imap server.

Snapshots are additional namespaces with mail from various points in
time. We need a way to easly copy
multiple messages from snapshots to current mailboxes. It would be
best to make current mailbox available
as another namespace so one would simply copy messages from one folder
to another.

Is it safe ? There will be times when given user is writing to the
same nfs based Maildir mailbox from 2 nodes
both of them having separate index files. What will happen if already
present message gets copied back
from the snapshot ?


Regards,

Micha? Grz?dzicki

On 26.12.2012, at 22.01, Lazy <lazy404 at gmail.com> wrote:
> We run dovecot 2.1 on 2 nodes with shared nfs storage. Index files are
> kept on local disk.
> Second node is usually used only for email snapshots access. If
> primary node fails it is configured to
> take place of the primary imap server.
> 
> Snapshots are additional namespaces with mail from various points in
> time. We need a way to easly copy
> multiple messages from snapshots to current mailboxes. It would be
> best to make current mailbox available
> as another namespace so one would simply copy messages from one folder
> to another.
> 
> Is it safe ? There will be times when given user is writing to the
> same nfs based Maildir mailbox from 2 nodes
> both of them having separate index files. What will happen if already
> present message gets copied back
> from the snapshot ?
If the snapshots are entirely different files/directories, then there
shouldn't be any trouble. If the same message gets copied it's simply
duplicated.

If the snapshots have one or more files shared with the non-snapshots, then I
don't really understand your setup.

You can anyway use namespaces or doveadm import.