[ngw] Spreading the IMAP/POP load

Mary Matthews mlm23 at calvin.edu
Thu Apr 8 14:27:43 UTC 2010

What about setting up separate GWIAs?  1 for POP and 1 for IMAP, on a different server(s) and advise your users of the change.  Been tumbling that one around in my head since BrainShare as Laura pointed out how "chatty" iPhones are.

>>> "Lilith Calbridge" <lilith at dcccd.edu> 3/10/2010 10:27 PM >>>
I'll look into these but with the state telling us their funding is going to be cut 5% each of the next two years you can imagine what that does to a lot of utility programs.  It looks like the biggest outlay of funds in the coming year is virtualization of workstations.  So, lots of funds for server farms but software???  I'll have to see how that goes.

>>> On 3/10/2010 at 9:20 PM, Rand Babcock <randbabcock at gmail.com> wrote:

How is your budget? An L4 switch can load balance pretty much any protocol. There are also software based solutions as well:






On Wed, Mar 10, 2010 at 8:00 PM, Lilith Calbridge <lilith at dcccd.edu> wrote:

How is everyone handling their provisioning for POP and IMAP where you have large numbers of users? Running GWIA on NetWare I'm seeing a heavy load on the GWIA when just a few sessions are active and at some point the needle pegs at 99% and everything becomes useless. I'm about to separate the POP and IMAP from the SMTP (had to maintain it there for historical reasons) but it still looks as if it will tax the server. I've seen over 100 inactive sessions on IMAP alone with close to 30 at a time being active when it pegs out.
So how do y'all handle the load? Wouldn't it be nice if GW had a failover capability, have a farm of such servers over which the sessions could be spread?
Is there any advantage to adding a second CPU to a NetWare GWIA server?
So many questions.

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