Hi All,
A question about performance and settings for the toaster:
When adjusting the maximum number of mysql connections allowed, should
that number be matched to the total number of connections set in:
concurrencyincoming
and
concurrencyremote
?
In other words, if I have 160 incoming and 60 remote, should I have 220
mysql connections available to service them?
If not, is there a recommended ratio of mysql connections to concurrency
settings?
Also as the number of clients migrating from our older toaster to our new
one increase (we're sitting at about 110 vdomains now on a dual xeon 3 GHZ
with 4 GB RAM, U320 SCSI, RHEL 4 OS, current 2.6 SMP kernel) we're
starting to get random performance complaints (mail delays of up to
several hours, refused connections that "clear up after a few minutes",
"sluggish response").
Example client errors are:
"the operation timed out while waiting for the SMTP server to respond",
or
"the connection to the server was interupted"
We are also running into strange problems with sending and receiving as
outlined in previous emails (multiple passwd prompts for two client
vdomains, one client can send to boxes within his own domain, but not
relay, though this only when connecting from his corporate LAN).
Both clients can reproduce this error with outlook, tbird, etc., so it
doesn't appear to be a mail client issue.
The really weird thing about about all this is, that the older toaster was
only a single pentium III 933 with 1 GB RAM, where we had no performance
complaints with nearly 150 clients and often thousands of emails in the
queue at any given time (the new box has been floating around 350 in the
queue at any given moment).
The only significant config diffs between the two toasters are no spamd,
clamd, smtp-auth (we used pop-before-SMTP), or qmail-plus on the older
box. Mysql 3.23.58 on the old box and 4.1.20 on the new one.
I've already shut down the toaster to check the mysql DBs for errors; all
come back clean.
Any suggestion would be *greatly* appreciated.
--Duncan
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