17 Apr
2012
17 Apr
'12
8:57 p.m.
Here we have approx. 200K users with 4000 concurrent connections(90% POP3 users) All servers in virtual environment Vmware, supermicro
servers and Netapp Metrocluster storage solutions (nfs storage with 10G
ethernet network) POP3 sessions take betwen 40 and 300 milisecons at
connect, auth and list. All accounts lives in LDAP, CentOS 5 and exim
like a mta relay.
Similar setup here. Maybe 15-20K concurrent connections, imap only (pop is not handled by dovecot yet) about 800K mailboxes. We have all bare metal servers, linux. Currently 35 servers handling the load easily. We could run on 1/3rd of the load probably.
In front of the 35 servers are 3 directors, handling imap only, although im in the process of adding LMTP/sieve to the mix.
Backend storage is NetApp Metrocluster over 2 datacenters.
Cor