What is a best practice for sql server 2008 installation path for shared features directory?

What is a best practice for sql server 2008 installation path for shared features directory?
 Is it better to install it on different disk than the OS or does it matter for performance?
syssjuAsked:
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Raja Jegan RSQL Server DBA & Architect, EE Solution GuideCommented:
>> What is a best practice for sql server 2008 installation path for shared features directory?

Better install those set of things in the System drive itself. Make sure that User databases and tempdb are installed in another physical drives.

>> Is it better to install it on different disk than the OS or does it matter for performance?

For performance, you can install it in the system drive as mentioned earlier.
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syssjuAuthor Commented:
Can you explain the reason to install the shared feature on the system drive?
I heard something about it can slow your sql databases when both windows and sql master database is on the same drive because they compete for read/writes to disk, is this true? Or this only depends when you don´t move the tempdatabase?
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Raja Jegan RSQL Server DBA & Architect, EE Solution GuideCommented:
Since you ask in specific, providing this one referred from Microsoft Support:

"If you can use the default path for the shared components, do not change the path in the Shared component directory box on the Feature Selection screen of the Install SQL Server 2008 Setup wizard."

http://support.microsoft.com/kb/955458

By trying to change your default installation path for these shared components, you may end up in errors or in incorrect installation.

>> I heard something about it can slow your sql databases when both windows and sql master database is on the same drive because they compete for read/writes to disk, is this true? Or this only depends when you don´t move the tempdatabase?

Haven't heard like that till now. Its the best approach to have master and other system databases installed in the system drive and you wont be using it much frequently and hence you wont have the read/ write competency for these databases.

But it applies to tempdb as it is used by our applications and user databases and hence tempdb and user databases needs to be present in another drives apart from system drive.

Kindly revert if you need detailed explanations.
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syssjuAuthor Commented:
Thank you for the help. Best regards Vladan
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Raja Jegan RSQL Server DBA & Architect, EE Solution GuideCommented:
Welcome and glad to help you out.
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