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kokhong

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Hi,

Anyone out there with experience tweaking Kerio 5.7.x to scale to say 500-1000 users on Win2K or Linux?

Or how to spread Kerio among multiple servers?

What parameters can we tweak on Kerio's end and what can we tweak on the OS?

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jshaw541

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kokhong wrote on Thu, 09 December 2004 06:02

Hi,

Anyone out there with experience tweaking Kerio 5.7.x to scale to say 500-1000 users on Win2K or Linux?

Or how to spread Kerio among multiple servers?

What parameters can we tweak on Kerio's end and what can we tweak on the OS?




I'm currently using 6.0.4 (with Active Directory integration) to cover about 1300 active users on a Dell PowerEdge 2650 with dual 2.2 ghz XEONs and 2gb ram and the machine has plenty of CPU/RAM/etc to spare. Used to run 5.7.x on it and it ran the same.

Kerio MailServer 6.7.1 w/AD
Windows Server 2003 SP 1
Dell PowerEdge 2850 (Dual Xeon 3.2ghz and 2 GB RAM)
~1300 users
~1000+ concurrent IMAPS connections
iPhone users
Outlook 2007 KOFF users
Apple iCal 10.5/10.6 users
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kokhong

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Hi jshaw541,

First...Thanks for replying!

Did you have to tweak the OS or Kerio to handle the load? Or does things works pretty much out of the box?

btw...spent three years in nearby Corvallis...rainy...but beautiful...
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waltspar

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Are these 1300 users Outlook/Outlook Express clients? Do they use Webmail? Do you have Public folders and LDAP address books? We have only about 55 users total running on a 100mbit switched network with Outlook and Outlook Express clients and Outlook especialyl is dog slow on updating/dnloading Email. The server is a decent 1.7ghz with 512meg and a 4 drive RAID 5 array. I am thinking our issue may be public folders, as we have hundreds - but we have no way to map to shared folder except in Webmail due to the crappy performance of the KOC.
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jshaw541

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kokhong wrote on Sat, 11 December 2004 07:38

Hi jshaw541,

First...Thanks for replying!

Did you have to tweak the OS or Kerio to handle the load? Or does things works pretty much out of the box?

btw...spent three years in nearby Corvallis...rainy...but beautiful...


Didn't have to tweak the OS at all. We're on Windows 2003 now, and the system seems slightly faster than it was under Windows 2000 Server.

With KMS, we have performance problems that prevented us from using blacklisting. This is probably not a direct KMS problem, but rather a problem of SMTP connections being tied up waiting for the blacklist DNS replies. Setting up a caching DNS server for KMS to query would probably greatly help things here.

We now run a postfix/spamassassin/amavisd-new mail server that filters all email coming into our organization from the Internet:

(internet)->(postfix box)->(internal KMS server)

We did this for two reasons: 1.) because the spam filtering stuff in KMS was not meeting our needs, feature-wise (SPF, SA 3.0, the ability to dump emails with a spam score greater than x), and 2.) KMS performance degradation when using a lot of custom spam rules and blacklists.

An additional note about SPF. It is included in SpamAssassin 3.0. So when/if Kerio ever moves to SA 3.0, it will then have SPF functionality. Kerio won't ned to implement it like they did Caller-ID.

Kerio MailServer 6.7.1 w/AD
Windows Server 2003 SP 1
Dell PowerEdge 2850 (Dual Xeon 3.2ghz and 2 GB RAM)
~1300 users
~1000+ concurrent IMAPS connections
iPhone users
Outlook 2007 KOFF users
Apple iCal 10.5/10.6 users
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