NVME-FEAT-HCTM(1) NVMe Manual NVME-FEAT-HCTM(1)

nvme-feat-hctm - Get and set host controlled thermal management feature

nvme [<global-options>] feat hctm <device>
                        [--tmt1=<tmt1> | -t <tmt1>] [--tmt2=<tmt2> | -T <tmt2>]
                        [--sel=<select> | -S <select>] [--save | -s]

Get and set host controlled thermal management feature.

The <device> parameter is mandatory and may be either the NVMe character device (ex: /dev/nvme0), or a namespace block device (ex: /dev/nvme0n1).

If any of the setting options (--tmt1 or --tmt2) are specified, the command will update the host controlled thermal management configuration. If none of these options are specified, it will retrieve and display the current configuration.

On success it returns 0, error code otherwise.

-t <tmt1>, --tmt1=<tmt1>

Thermal Management Temperature 1. Specifies the temperature threshold in Kelvin at which the controller transitions to lower power states or throttling.

-T <tmt2>, --tmt2=<tmt2>

Thermal Management Temperature 2. Specifies the secondary temperature threshold in Kelvin for heavy throttling or critical cooling actions.

-S <select>, --sel=<select>

Select (SEL): This field specifies which value of the attributes to return in the provided data:

-s, --save

Save the attribute so that it persists through all power states and resets.

The following options are defined at the top-level nvme command and are available to this subcommand:

--dry-run

Print the command that would be executed, but do not actually execute it.

--no-ioctl-probing

Disable probing for 64-bit IOCTL support.

--no-retries

Disable retry logic on transient errors.

-o <fmt>, --output-format=<fmt>

Set the reporting format to normal, tabular, 'json, or binary. Only one output format may be used at a time.

--output-format-version=<version>

Select the output format version. Version 1 uses the original field naming, while version 2 (default) provides more consistent and script-friendly field names.

--timeout=<ms>

Set the timeout for the command in milliseconds.

-v, --verbose

Increase the level of detail in the output. May be specified multiple times to further increase verbosity.

These options can also be set as machine-wide defaults in nvme-cli.conf(5). A command-line flag always overrides the file.

•Has the program issue a feat hctm to get the current configuration: 
# nvme feat hctm /dev/nvme0
•Has the program issue a feat hctm to set TMT1 and TMT2 thresholds with saving enabled: 
# nvme feat hctm /dev/nvme0 --tmt1=320 --tmt2=330 --save

Part of the nvme-user suite.

09/07/2026 NVMe