Cyrus murder scalability

[Vladimir Nikolic]

Hi,

I have questions regarding murder scalability. Untill last week we had 
one imap server with about 50000 users and 2TB mailboxes. Server was 
overloaded and little slow but there was no troubles like connections 
drop and repeatedly asking users for password.
Now we have that old server and three new servers in murder 
configuration (1 frontend, 1 murder master in 2 backends) and we have 
full troubles with users (almost all of them with pop3 accounts) 
complaining that mail clients repeatedly asking for password. Logs on 
fronted are full of lines:

pop3[12914]: couldn't authenticate to backend server
pop3[9822]: couldn't authenticate to backend server: authentication failure

clients -> frontend and fronted -> backends authentications are made 
through sql sasl_auxprop_plugin (all servers runnig MySQL server which 
replicates table with usernames/passwords from same source). I've tried 
with saslauthd authentication between frontend and backends but there 
was no help.
Is there any config options regarding timeouts and maximum connections 
between frontend and backend servers?

Regards,
Vladimir

-- 
*  Vladimir Nikolić* | Sistemski administrator / System Administrator

   *Amis* | Tržaška cesta 85 | 2000 Maribor | Slovenija
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