The Avg. Disk sec/Transfer (PhysicalDisk\Avg. Disk sec/Transfer) for the physical disk has exceeded the threshold. The physical disk and possibly even overall system performance may significantly diminish which will result in poor operating system and application performance.
The Avg. Disk sec/Transfer counter measures the average time of data reads and writes on the disk.
The Avg. Disk sec/ Transfer counter is made up from both read and write disk Transfer requests. To view recent disk average rate of read and write Transfer requests you can use the following views:
Physical Disk\Avg. Disk Sec/Reads Performance View
Physical Disk\Avg. Disk Sec/Writes Performance View
A high Avg. Disk sec/Transfer performance counter value may occur due to a burst of disk transfer requests by either an operating system or application.
To view recent history for the Physical Disk\Avg. Disk sec/Transfers performance counter you can use the following view:
Start Physical Disk Performance View
To increase the available storage subsystem throughput for this physical disk, do one or more of the following:
Upgrade the controllers or disk drives.
Switch from RAID-5 to RAID-0+1.
Increase the number of actual spindles.
Be sure to set this threshold value appropriately for your specific storage hardware. The threshold value will vary according to the disk’s underlying storage subsystem. For example, the “disk” might be a single spindle or a large disk array. You can use MOM overrides to define exception thresholds, which can be applied to specific computers or entire computer groups.