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iotop

Per-process disk I/O monitor.

iotop displays the disk read and write bandwidth used by each process in a top-style interface, with sorting by read, write, or total I/O. It relies on the Linux kernel's per-task I/O accounting, which must be enabled at boot.

It is the standard tool for diagnosing which process is responsible for unexplained disk activity.

Debian/Ubuntu: sudo apt install iotop
Fedora:        sudo dnf install iotop
Arch:          sudo pacman -S iotop