[Kolab-devel] Cyrus Murder and kolab

[christophe robert]

Matt Douhan wrote:

>On Monday 16 May 2005 12.55, christophe robert wrote:
>  
>
>>Martin Konold wrote:
>>    
>>
>>>      
>>>
>>If i reformulate my question .
>>
>>How many users i could  to put in one server  ( with kolab ) and when i
>>must to install a design like murder ..
>>
>>for example :
>>If i have around 5000 or 10000  users and  90000 mails  by day ,   is
>>it  serious with kolab to have a centralized server .
>>    
>>
>
>90000 emails / day = 90000 / 24 = 3750 emails / hour wich is ok for a decent 
>single CPU P4 and 1GB RAM box
>
>We are handling 5000 emails / hour on a Xeon 3Ghz / 2 GB RAM IBM server and 
>that runs nicely, just do not underestimate disk I/O when you design your 
>server.
>
>  
>

That's right .. 

Do you use an external card like "Umem (cache)" to improve the writing .

Is it possible to use disks "10000 RPM"  without  having a bottleneck  
(in Writing ) for this configuration


Thanks ..

>Also the busier the server you need to consider your backup solutions and make 
>sure the filesystem has snapshot capabilities, otherwise service disruption 
>will be huge when you have to stop the imap master to backup the message 
>store, we use FreeBSD and the -L flag to dump and that allows us to backup a 
>live filesystem.
>
>We have 2 even larger installations than this too, but I cannot go into to 
>much details about them in public before asking the clients.
>
>rgds
>
>Matt
>
>  
>

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