Am 06.12.2013 11:28, schrieb JEHERUL:
Dear All,
Currently we are running a mail system for 10000 users each 2GB mailbox. At present we have 5 mail servers where users mailboxes are distributed almost uniformly.
looks enough
We have a HP SAN Storage (HP EVA 6400) where mailboxes are
stored. We partition the storage into five vg and each is mounted on the 5 servers. We are using postfix and dovecot.
The system was running fine but currently we notices high IO load due to IMAP connection. So we are planning to build a dovecot cluster.
ident the io problem on the storage, give more info about mailbox format etc
perhaps read
http://wiki2.dovecot.org/MailLocation/SharedDisk http://wiki2.dovecot.org/NFS
Please suggest some design for the dovecot cluster keeping in mind to our scenario. (If needed we can buy additional hardware like load balancer).
you should use loadbalancer, you dont have to buy it , something like keepalived etc is enough, however you should use
http://wiki2.dovecot.org/Director with more servers
for an idea with loadbalancers look at
http://sys4.de/de/blog/2013/06/10/loadbalancing-mit-keepalived-postfix-dovec...
( sorry german only )
With Thanks and Regards
at last you have to give more info like dovecot version , config logfiles , general setup
Best Regards MfG Robert Schetterer
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