Physical Disk\Split IO/sec

Split IO/sec is the rate physical disk requests were split into multiple disk requests during the sampling interval. A large number of split IO/s indicates that the disk is fragmented and performance is being affected. The percentage of Split IOs can be calculated by the following formula where "n" is a specific disk:

(Physical Disk(n)\Split IO/sec ÷ Physical Disk(n)\Disk Transfers/sec) * 100

If this percentage is greater than 10 to 20 percent, check to see whether the disk needs to be defragmented.

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