Problems with disk I/O operations are manifested through slow response times, operation time outs, and system bottlenecks SQL Server uses I/O calls to perform reads and writes on a disk, it defines and manages requests for reading and writing the data, while the operating system actually performs the I/O operations. This is where logical disk metrics are useful, as they show more granular results and help determining effect of SQL Server or any other application on disk performance Some physical disk metrics might not be sufficient for deeper investigation and troubleshooting if you have more than one logical partition on a disk. The metrics in both groups are the same, the only difference is whether they show the performance for a single partition, or for the entire disk A Logical disk is a disk partition, while a physical disk is the complete physical disk with all partitions created on it. Most of these metrics are available in Windows Performance Monitor, where they are divided into 2 groups – Physical Disk and Logical Disk metrics. Then, compare the current metric values to baselines For SQL Server disk performance monitoring, it’s recommended to monitor the metrics for a while, determine the trend, and set a baseline for normal operation. That’s why it’s necessary to understand the cause and effect of each metricĭisk metrics are not related only to disk itself, but to the whole disk subsystem which includes disk, the disk controller card and the I/O disk system bus. a disk issue can cause processor bottlenecks. Sometimes a metric from one category can be masked by other events and be misleading – e.g. Besides memory and processor metrics, equally important are SQL Server disk metrics. These metrics indicate system and SQL Server performance, and are useful for troubleshooting performance issues and bottlenecks. So far, we have presented the most important memory and processor metrics.
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