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 rs@sys4.de 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-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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