Understand storage activity input/output and latency
Infrastructure admin and infrastructure viewer users can view information about storage activity and latency information from the Compute Usage section of the application instances page as well as the Activity tab of the storage pool page.
I/O operations per second (IOPS) - read and write. An I/O performance measurement used to characterize computer storage devices like hard disk drives (HDD), solid state drives (SSD), and storage area networks (SAN).
Queue Length (queue depth). The number of I/O requests (SCSI commands) that can be queued at one time on a storage controller. Each I/O request from the host's initiator HBA to the storage controller's target adapter consumes a queue entry. (Note: This number will vary as it shows how much your system is maxing at that moment.)
Calculating your I/O rate
Latency is a measure of how long it takes for a single I/O request to occur from the standpoint of an application instance.
For example, if your charts show that IOPS are at 160,000, that means that 160k I/O operatins are occurring in 1 second, which makes 1 IO take 0.00000625 of a second.