Craig Sanders wrote:
On Wed, Nov 24, 2004 at 07:15:43PM +0200, Uffe Pensar wrote:I'm in the process of separating the webmail from the imap and I have have installed xinetd with
[141 lines of quoted material deleted. please learn to trim your quotes ]ok thanks for all the good advices, I will install postfix and have a look att the dovecot and xinetd packages
if you're running dovecot, you don't need xineted. it is a standalone daemon, which has it's own (configurable) limits on maximum simultaneous connections.
but as a quick fix its seems that authenticating from a local server
(instead of radius) and restricting the number of webmailsessions has
helped for the moment. But I suppose we have to buy more servers in
the near future.
yes, separating the tasks of 1) sending & receiving mail and 2) storing it & providing imap/pop/webmail/etc access is very useful.
remember that mail is an I/O bound system. i.e. most of the time the processor is sitting idle waiting for disk I/O to complete. upgrading the CPU will do little or no good here. to improve performance, you need to improve the I/O speed - you can do this with faster disks, hardware raid card with large non-volatile cache, and by adding more RAM to the system. or by spreading the I/O load over more disks and/or more servers.
max_load and other limits.
But still I can't understand that i get those hanging imapd processes ?
# ps axu|grep imapd|grep root root 22700 0.0 0.0 4064 1308 ? S Nov25 0:00 [imapd] root 11359 0.0 0.0 4064 1400 ? S Nov27 0:00 [imapd] root 6473 0.0 0.0 4064 1400 ? S Nov27 0:00 [imapd] root 3801 0.0 0.0 4064 1400 ? S Nov27 0:00 [imapd] root 6194 0.0 0.0 1752 732 pts/7 S 21:11 0:00 grep imapd
woody and uw-imap-ssl (those hanging connections are not coming from webmail)
- uffe
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