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 Allocation Unit Size & System Db file location

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chris_wood99
Yak Posting Veteran

70 Posts

Posted - 2011-04-06 : 10:57:26
Hi,

I have 2 questions... have received a build from external provider, they forgot to Change the Allocation Unit size on the server. They have managed to Update the Data & Log files, but cannot change backup or Tempdb (which we make heavy use of) there might be a delay in the rebuild and im on a tight deadline, but have been instructed to provide optimum performance for the server. Sounds like I could create a bottleneck if I dont have it setup properly, opinions?

My 2nd question is regarding system DB file location. It is common knowledge to split the data nad log files for all user db's. But is there a performance gain in spliting Master, MSDB, model & Tempdb ?

Thanks,

Chris

tkizer
Almighty SQL Goddess

38200 Posts

Posted - 2011-04-06 : 12:45:57
I don't ever split up the files for master, msdb, or model. But I do split them up for tempdb as that's a best practice.

The allocation unit size of 64kb is a best practice, however it doesn't make a huge performance difference. In fact I've heard people say you won't even notice a perf difference.

Tara Kizer
Microsoft MVP for Windows Server System - SQL Server
http://weblogs.sqlteam.com/tarad/

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