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From: Pierre Chifflier (no email)
Date: Wed Apr 04 2007 - 10:28:07 EDT
Hi,
I am currently trying to gather informations on the cyrus vs NFS
situation. I'm sorry if this has been asked several times on the mailing
list, what I need is some details, to understand correctly the situation
and evaluate the viability of some projects.
The FAQ and some messages mention that it is unsafe, for ex:
http://www.irbs.net/internet/info-cyrus/0503/0238.html
http://kolab.org/pipermail/kolab-devel/2005-July/004033.html
As I understand, there are two problems:
* using locks is unsafe on NFS, especially for db files
* some problems with mmap
It seems that recent changes (say, last 4-6 months) in the linux kernel
have been made to try to solve this problem.
Some informations:
- linux/debian etch (kernel 2.6.18)
- postfix (2.3) + cyrus-murder + cyrus imap (2.2.10)
- backend would be connected to a NAS. It could get up to 10k IMAP
connections (simultaneous), while the postfix could receive 500k mails
per day
So, here are my questions:
- did the situation change ?
- is it possible to know precisely if a backend will work or not with
NFS ? Known working (or not-working) situations ?
- is there a way to avoid the problem, or to test if it is still
present ?
Thanks
Regards,
Pierre
---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
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