Hi,
I did some experiments with dovecot on a glusterfs on the active nodes without a director. So I had concurrent access to the files.
With the help of the available documentation about NFS and fcntl locks I managed to find out the following:
With the plain mbox format dovecot seems to apply and to honor the fcntl locks. But since this format is not used any more in real setups, it is useless.
With mdbox and maildir format I could reliably crash my mail storage just by delivering mails to the both dovecots via LMTP to the same user. In maildir dovecot seems not the set / respect the fnctl locks of the index file. dotlocks do not seems to work either with mdbox.
So I think the only solution os to use a director in a real world setup. Or is there any non-obvious trick that I did not check?
I think it would be really nice if dovecot could use glusterfs for realy scalable postbox servers.
Mit freundlichen Grüßen,
Michael Schwartzkopff
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