dmevent_tool

dmevent_tool [options] [device]

dmevent_tool is a utility for interacting with the device-mapper event daemon (dmeventd). It allows registering and unregistering device mapper devices for event monitoring and querying their status.The device-mapper event daemon monitors DM devices for events like failures, threshold crossings, or configuration changes. When events occur, dmeventd can trigger configured responses such as alerting or automatic repair.This tool is typically used with LVM thin provisioning, RAID, and other device-mapper-based storage configurations that benefit from event-driven monitoring.

DEVICE

Device mapper device name.

List registered devices.

Register device for monitoring.

Unregister device from monitoring.

Show device monitoring status.

Display help information.

Requires dmeventd running. Root privileges needed. Only works with device-mapper devices. Event handling depends on configured plugins.

dmevent_tool is part of the LVM2 device-mapper tools developed by Red Hat. The device-mapper event monitoring infrastructure provides reactive storage management for enterprise Linux deployments.

dmsetup(1), lvm(1)