ioztat

ioztat is a storage load analysis tool for OpenZFS. It provides iostat-like statistics at an individual dataset/zvol level. The statistics offered are read and write operations per second, read and write throughput per second, and the average size of read and write operations issued in the current reporting interval. Viewing these statistics at the individual dataset level allows system administrators to identify storage "hot spots" in larger multi-tenant systems -- particularly those with many VMs or containers operating essentially independent workloads.