Am Dienstag, 13. Januar 2015, 21:40:34 schrieb Nick Edwards: > On 1/13/15, Michael Schwartzkopff <m...@sys4.de> wrote: > > 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? > > Interesting, we use NFSv3 dovecot LDA with maildir, we have at present > two dozen front end SMTP servers (using dovecot-lda) and some, hrmm we > added a few more over Christmas, so I think about 32 pop3 servers, > but with only 4 imap servers incl webmail (IMAP is not heavily used > here due to government spy laws) talking to NAS storage server > backend, *we do not use director* at all and has never been an issue. > Director IIRC solves the problem of IMAP inconsistency, but we never > see advantage when we tested, no doubt it solves some fancy setup > problem, but since director can not help with pop3, it was not worth > the hassle. never had any problems with webmail either, load balancers > seem to look after it well
Yes. NFS has its own locking. I wanted to use plain glusterfs client without the detour of NFS. Thanks for your hint. Mit freundlichen Grüßen, Michael Schwartzkopff -- [*] sys4 AG http://sys4.de, +49 (89) 30 90 46 64, +49 (162) 165 0044 Franziskanerstraße 15, 81669 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein
