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SQL Server Disk Configuration Question

SQL Server 2012 running on Server 2012.

Multiple instances on the same SQL Server.

I have enough hard drive configuration to give each instance EITHER:
a) it's own log file hard drive
b) it's own data file hard drive

I cannot give each instance its own log file hard drive AND its own data file hard drive.

So which would be optimal for performance?  Individual data file hard drives (with all log files on a single shared drive), or individual log file hard drives (with all data files on a single shared drive)?

Thanks.
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gateguard
Asked:
gateguard
2 Solutions
 
Mohammed KhawajaCommented:
My recommendation would be to distribute data files and log files equally across all disks and I am assuming all drives are of similar speed.  As an example I would configure instance 1 data files to be on D: and logs on E: and it would the opposite for instance 2.
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BradySQLCommented:
If you have to choose I would put the logs on their own volume for a few reasons.

1. Data files can easily be separated later by creating additional datafiles and moving high IO items such as a specific table or Indexes to the secondary datafile.

2. Logs have a lot of writes that happen where the data volume doesn't necessarily. This can be different depending on your situation.

Other thoughts, you may want to consider the impact of sharing some volumes with your logs and separating tempDB to its own volume. This has a lot to do with transactions per second and where you see your bottlenecks happening.

There is not golden answer here, it might also involve you setting up one scenario and watching to see what your IO throughput looks like. And making some changes as you go.
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gateguardAuthor Commented:
Thanks!
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