NVMECTL(8) | System Manager's Manual | NVMECTL(8)

# NAME

`nvmectl` —
NVM Express control utility

# SYNOPSIS

`nvmectl` | `devlist`

`nvmectl` | `identify` [`-x` [`-v`]] device_id

`nvmectl` | `logpage` [`-x`] [`-p` page_id] [`-v` vendor-string] [`-b`] device_id|namespace_id

`nvmectl` | `power` [`-l`] [`-s`] [`-p` power_state] [`-w` workload_hint] device_id

`nvmectl` | `wdc cap-diag` [`-o` `-path_template`] device_id

# DESCRIPTION

NVM Express (NVMe) is a storage protocol standard, for SSDs and other high-speed storage devices over PCI Express.

## power

The power command controls the supported power states. `-l` will list supported power states. `-p` will set the power state to specified value. `-w` will set workload value. With `-s`, the specified power state and workload value is saved, so it persists any autonomous transitions and resets. Support for saving the values is optional, and depends on the controller.

## logpage

The logpage command knows how to print log pages of various types. It also knows about vendor specific log pages from hgst/wdc and intel. Page 0xc1 for hgst/wdc contains the advanced smart information about the drive. Page 0xc1 is read latency stats for intel. Page 0xc2 is write latency stats for intel. Page 0xc5 is temperature stats for intel. Page 0xca is advanced smart information for intel.

Specifying `-p` `help` will list all valid vendors and pages. `-x` will print the page as hex. `-b` will print the binary data for the page.

## wdc

The various wdc commands retrieve log data from the wdc/hgst drives. The `-o` flag specifies a path template to use to output the files. Each file takes the path template (which defaults to nothing), appends the drive's serial number and the type of dump it is followed by .bin. These logs must be sent to the vendor for analysis. This tool only provides a way to extract them.

# EXAMPLES

`nvmectl devlist`

Display a list of NVMe controllers and namespaces along with their device nodes.

`nvmectl identify nvme0`

Display a human-readable summary of the nvme0 IDENTIFY_CONTROLLER data.

`nvmectl identify -x -v nvme0ns1`

Display an hexadecimal dump of the nvme0 `IDENTIFY_NAMESPACE` data for namespace 1.

`nvmectl logpage -p 1 nvme0`

Display a human-readable summary of the nvme0 controller's Error Information Log. Log pages defined by the NVMe specification include Error Information Log (ID=1), SMART/Health Information Log (ID=2), and Firmware Slot Log (ID=3).

`nvmectl logpage -p 0xc1 -v wdc nvme0`

Display a human-readable summary of the nvme0's wdc-specific advanced SMART data.

`nvmectl logpage -p 1 -x nvme0`

Display a hexadecimal dump of the nvme0 controller's Error Information Log.

`nvmectl logpage -p 0xcb -b nvme0 > /tmp/page-cb.bin`

Print the contents of vendor specific page 0xcb as binary data on standard out. Redirect it to a temporary file.

`nvmectl power -l nvme0`

List all the current power modes.

`nvmectl power -p 3 nvme0`

Set the current power mode.

`nvmectl power nvme0`

Get the current power mode.

# HISTORY

The nvmecontrol utility appeared in FreeBSD 9.2.

# AUTHORS

nvmecontrol was developed by Intel and originally written by Jim Harris <jimharris@FreeBSD.org>.

This man page was written by Jim Harris <jimharris@FreeBSD.org>.

September 27, 2020 | NetBSD 10.0