How Is My Disk Behaving?

All disk panels are scoped per attached volume — pick the volume from the dropdown at the top of the section.

Throughput — Read / Write

Bytes per second that the guest is asking the storage layer for, measured on the host side of the block device. This is the ground-truth view, independent of anything the guest reports.

Operations (IOPS) — Read / Write

Read and write requests per second. Read together with Throughput to compute the average request size — small-block random I/O and large-block sequential I/O behave very differently and should be reasoned about separately.

Disk Utilization

How busy the block device is, derived from cumulative service-time counters. This is the panel that distinguishes "my disk is slow" from "my disk is busy":

• High utilization at high IOPS — the workload is saturating its disk tier. Reduce the request rate, batch writes, or upgrade the disk tier.

• High utilization at low IOPS — request rate is modest but each request is slow. This points at the storage backend; contact support.

API Reference

All disk metrics use DescribeDiskMonitorData with the metricType values below.

Console Panel	metricType
Throughput — Read	DISK_READ_BYTES
Throughput — Write	DISK_WRITE_BYTES
Operations (IOPS) — Read	DISK_READ_OPS
Operations (IOPS) — Write	DISK_WRITE_OPS
Disk Utilization	DISK_UTIL