Hi Robert, Thanks for your quick reply. I have already read the document you have mentioned but I am unable to come to any decision.
At present we have ext4 file system in our storage. So it is not possible to use NFS at our present situation. I think we should migrate to GFS2 or glusterfs. But lots of people in mailing list raising question about the performance issues of NFS. I am really confused about it. Can you share some design document for load balancing or clustering ... Regards Jeherul On Fri, Dec 6, 2013 at 4:42 PM, Robert Schetterer <[email protected]> wrote: > 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 > -- Jeherul Islam Scientific Officer Computer Centre Indian Institute of Technology Guwahati Guwahati-39 India Office No :+91-361-258-3353
