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-dovecot/ ( 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 -- [*] sys4 AG http://sys4.de, +49 (89) 30 90 46 64 Franziskanerstraße 15, 81669 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Axel von der Ohe, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein
