Recommended number of services to run on a server

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Could i ask how many services you would recommend running on a server.  In our network setup i have the following

SERVER 1 - SMALL BUSINESS SERVER (EXCHANGE, SQL, SCANMAIL FOR EXCHANGE)
SERVER 2 - FILE SERVER / DOCUMENT IMAGING SOFTWARE
SERVER 3 - WEB SERVER
SERVER 4 - BACKUP SERVER / TREND CONTROL MANAGER
SERVER 5 - WSUS / TREND OFFICE SCAN

thank you for your input
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I think it ultimatley depends upon your server hardware. A server running 12 GB memory and 1 TB of drive space will obviously be able to support more programs/services than a machine running 4 GB with 500GB of space.
Neil RussellTechnical Development Lead

Commented:
Are these PHYSICAL servers or VIRTUAL servers?
 

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I was thinking more in terms of how many services you could tolerate loosing at once if a particular server failed.  I was thinking that then it would be better to minimise the amount of critical services running on a particular server.  

Author

Commented:
Neilsr: These are phyiscal machines at the minute
Neil RussellTechnical Development Lead

Commented:
Ah well if that was what your after, go for ESX4 and a clustered server solution with a nice SAN. That way when a server fails, you loose nothing :D
I don't think there is any real true answer. It just really depends on what applications are running and what services crash. If your running SBS you have SQL, Exchange, Active Directory and IIS all running on one server. If IIS dies it is going to effect exchange and SQL (Sharepoint). If an exchange service fails it is going to halt email in and out fo the domain. I think you will cripple your organization if you try to build a server with only one function on each server. For example, it would not make sense for a business of 25 people to purchase a Domain Controller, an Exchange Server,  SQL Server, a Web Server and a File Server. Instead, purchase one very good SBS, have it properly maintained and make sure you have a solid backup.

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no

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