Why You Should Not Put Data and Log Files on the Same Drive in SQL Server
One of the checks in the Database Health Monitor Quick Scan Report that often raises questions is check #243: data and log files on the same drive.
At first glance, this might not seem like a big deal. After all, it’s just disk space, right? But in reality, placing your MDF/NDF files (data) and your LDF files (logs) together is a bad practice for two main reasons:
- Performance & I/O
SQL Server accesses data and log files in very different ways. Data files are typically random access, while log files are sequential writes. When they compete for I/O on the same drive, both suffer. This can create unnecessary performance bottlenecks. - Reliability & Recovery
If both your data and log files live on the same drive and that drive fails—you lose everything. Splitting them across separate drives doesn’t make you immune to failure, but it does increase your chances of recovering part of your database in an emergency.
This is exactly why the Database Health Monitor Quick Scan Report flags it. With over 240 checks (and growing), the Quick Scan can feel overwhelming at first. But the key is to chip away at the findings over time. Start with what matters most to you:
- Performance issues? Focus on the performance category.
- Security concerns? Review those items first.
- General cleanup? Tackle reliability checks like this one.
Every small fix adds up to a more stable, secure, and faster SQL Server environment.
If you’re not already using it, you can download Database Health Monitor for free at DatabaseHealth.com. It’s a great way to identify issues like this before they become big problems.
And if your team is overwhelmed with findings, that’s where we can help. At Stedman Solutions, our SQL Server Managed Services team takes care of monitoring, maintenance, and Performance Tuning so you can focus on your business. Learn more at Stedman Solutions Managed Services.
Need some help with Database Health Monitor. Check out our classes where you can learn all about Database Health Monitor.
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