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mpgough2000

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Hi,

I have recently taken on a customer running Kerio Mailserver with 100 users.

They have been experiencing performance issues when viewing large (1Gb+) mailboxes. The server is a new HP DL380 1.6G xeon 3.25Gb Ram.

I know its vague but do you know where I should be lookking? LAN or server performance?
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sedell

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If you're using the Kerio Outlook Connector (KOC), that's a known problem. Because of the lack of caching, the folder on the server has to be scanned as it's viewed. In addition to the delay just bringing up and viewing the folder, you'll also notice lags when scrolling through the messages. Every 20 or 30 messages there's a lag while info from the server is retrieved.

Most people report an improvement in speed with faster hard drives or arrays, up to a point. You could also check out LAN traffic - that could affect speed as well, since the mail is all remote to the PCs. Barring a major network problem or bottleneck, drive speed usually seems to be the biggest factor.

Scott
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tpalmer

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Another factor is the number of messages in the inbox - performance will definitely suffer with 1000+ messages in inbox. Large attachments in the Inbox can also hurt.

I went to a 0+1 Apple RAID array, and didn't see significant improvement. But then I have people with 4k+ messages just in their Inboxes, many of them with multi megabyte attachments.
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winkelman

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I agree. Faster hard disks (RAID arrays) help, but only up to a point.

Users would get a better experience not storing 1000+ messages in the most often used folders. Users who don't use separate mail folders and are on a Inbox and Sent Items only basis could at least be educated to create a 'Inbox - old' and 'Sent items - old' subfolder and once in a while drag older messages there. This would at least give them better speed.
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mpgough2000

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All,

Thanks for responses - these are the issues I suspected.

However i have run a Packet Sniffer on the netork today and have found at least 4 users using the Outlook Client Connection with emails stuck in their Outbox. They all have 30mb+ attachments and there is a limit of 15mb (apparently) - should this be happening?

THe way I discovered these was analysing the Kerio Server's top takers and these showed as transferring 10Gb+ of data in one day!
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sedell

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That's another issue with the KOC with Outlook 2003. If a message is bigger than the max size, it gets rejected by the server, but sits in the outbox and tries to deliver again. Depending on how the user has responded to prompts in the past, they may get a pop-up message telling them there was an internal error and contact your administrator, or just a little yellow exclamation mark in the Outlook status bar (which they never see). If you check your warning log, you should see something like this:

[07/Sep/2007 11:26:22] SMTP message too big (size 10912909 bytes, maximum 10485760 bytes). Message from user<_a.t_>domain.com, IP address 192.168.1.20 was rejected.
[07/Sep/2007 11:27:24] SMTP message too big (size 10912913 bytes, maximum 10485760 bytes). Message from user<_a.t_>domain.com, IP address 192.168.1.20 was rejected.
[07/Sep/2007 11:28:22] SMTP message too big (size 10912917 bytes, maximum 10485760 bytes). Message from user<_a.t_>domain.com, IP address 192.168.1.20 was rejected.
[07/Sep/2007 11:29:23] SMTP message too big (size 10912905 bytes, maximum 10485760 bytes). Message from user<_a.t_>domain.com, IP address 192.168.1.20 was rejected.
[07/Sep/2007 11:30:22] SMTP message too big (size 10912917 bytes, maximum 10485760 bytes). Message from user<_a.t_>domain.com, IP address 192.168.1.20 was rejected.
[07/Sep/2007 11:31:22] SMTP message too big (size 10912913 bytes, maximum 10485760 bytes). Message from user<_a.t_>domain.com, IP address 192.168.1.20 was rejected.
[07/Sep/2007 11:32:22] SMTP message too big (size 10912917 bytes, maximum 10485760 bytes). Message from user<_a.t_>domain.com, IP address 192.168.1.20 was rejected.
[07/Sep/2007 11:33:22] SMTP message too big (size 10912913 bytes, maximum 10485760 bytes). Message from user<_a.t_>domain.com, IP address 192.168.1.20 was rejected.
[07/Sep/2007 11:34:22] SMTP message too big (size 10912913 bytes, maximum 10485760 bytes). Message from user<_a.t_>domain.com, IP address 192.168.1.20 was rejected.


That will continue until the user realizes they have a message in their outbox and calls you for help, or you notice this in the logs and call them.

Scott
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mpgough2000

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I dont have any of those - but they aren't using SMTP they are using IMAP.
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microalps

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IMAP/POP is for fetching emails. SMTP is always used for sending emails, whether configured for IMAP/POP/KOC.
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