On Wed, 8 Nov 2006, Mark Crispin wrote:
On Wed, 8 Nov 2006, Dan Mahoney, System Admin wrote:
Yay! I had been following this issue with some trepidation, as my
situation is that I want to get USER shell processes (like pine) OFF of the
main server where delivery happens, as pine can get kinda hungry when
munching and searching large mailboxes (mine currently shows a 60 meg
footprint in top), and imap may still be attempting to access the mailbox
from the NFS server end, while pine would be accessing it from an NFS
client machine.
The good news for you is that NFS is alright for SHELL user mailbox files in
traditional UNIX mailbox format, but not for mbx and mix.
The reason why it's alright for shell users, and not for IMAP, is that shell
users generally do not hit their mailbox files with multiple MUA programs
(such as Pine) at the same time. In the rare instances when they do, it is
generally when they run an MUA at a new location even though they left one
running at the old location. The c-client library's "kiss of death"
mechanism is explicitly for this scenario.
IMAP clients, on the other hand, frequently invoke multiple sessions to the
same mailbox simultaneously. This is what causes the problems.
Hrmmm, so does this still represent a problem? For example, a user who
uses imap (which if I understand right is still imap) logs into pine to be
more able to use pine's better search features select and purge their spam
files...but the user forgets to kill outlook in the process.
This may not actually BE a NFS issue at all (and if it's not I apologize
for gettng off-topic with regard to the current) -- but does the above
scenario propose a risk toward mailbox corruption when done either a) on a
single box and b) on an NFS box, as above?
[snip...again]
I provide the mlock tool for those sites that feel that they have greater
security needs than the small, intimate, cooperative environment; but do not
want to go to delivery of mail to a directory owned by the recipient. I would
never run a system that way; so I would never use mlock.
Nor am I likely to, because, well, my mail gets delivered to the homedir
:)
-- Mark --
http://panda.com/mrc
Democracy is two wolves and a sheep deciding what to eat for lunch.
Liberty is a well-armed sheep contesting the vote.
--
"No mowore webooting!!!"
-Paul, 10-16-99, 10 PM
--------Dan Mahoney--------
Techie, Sysadmin, WebGeek
Gushi on efnet/undernet IRC
ICQ: 13735144 AIM: LarpGM
Site: http://www.gushi.org
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