Best practices for changing Database Directories for SQL Server 2008 R2

I have a  Server 2008 R2 server running SQL Server 2008 R2 and I need to change the Directory for the LDF and MDF files. The original install from a prior Sys Admin had everything installed on the C Drive 5 years ago. This is a Virtual Server on VMWare 5.5.  I know I can create new partitions but I'm looking for best advice to change the directories without causing intense excruciating pain on myself and my end users! I created separate directories on a SAN for the DATA and one for Log files.
Any advice is appreciated. Seems that a lot of online posts offer different scenarios. Let me know what additional info you need. Thanks
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Aneesh RetnakaranDatabase AdministratorCommented:
Best way to increase performance is to have multiple disk controllers. I am not sure in your case whether it is possible to have a couple of other drives from different SAN;  Creating separate drives on the same disk controller wont usually increase the performance.
kentpriceAuthor Commented:
Thank you Aneesh. What I'm looking for is not so much performance but a good "how to"in changing the database directory. Current SQL Data directory for Database files is C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\DATA and I want to change it to another partition. What is the best way to move the Databases to another partition?
Scott PletcherSenior DBACommented:
For user dbs:
1) Change the file location in SQL's metadata (in master) to the new location:
ALTER DATABASE db1 MODIFY FILE ( NAME = <logical_file_name>, FILENAME = 'x:\new\path\to\db\file\db1.mdf' )
--... one ALTER statement per filegroup and log file in the db
2) Take the db offline:
3) Copy (or move, if you're really really brave) the db files from the old location to the new one
4) Bring the db back online:

Whatever you do, do NOT detach the dbs!  That is an obsolete method of changing file locations on the same server.

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Scott PletcherSenior DBACommented:
It's similar for system dbs, but of course instead of taking the dbs offline you have to stop and start SQL Server.  For the master db, you have to change the file location in SQL's startup parameters, not (just) with an ALTER statement.
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