NVME-ID-NS(1)                     NVMe Manual                    NVME-ID-NS(1)

NAME
       nvme-show-regs - Reads and shows the defined NVMe controller registers
       for NVMe over PCIe or the controller properties for NVMe over Fabrics.

SYNOPSIS
       nvme [<global-options>] show-regs <device>

DESCRIPTION
       For the NVMe over PCIe device given, sends an identify namespace
       command and provides the result and returned structure. For the NVMe
       over Fabrics device given, sends a fabric command and provides the
       result and returned structure.

       The <device> parameter is mandatory and must be the nvme admin
       character device (ex: /dev/nvme0). For NVMe over PCIe, the program uses
       knowledge of the sysfs layout to map the device to the pci resource
       stored there and mmaps the memory to get access to the registers. For
       NVMe over Fabrics, the programs sends a fabric command to get the
       properties of the target NVMe controller. Only the supported properties
       are displayed.

OPTIONS
GLOBAL OPTIONS
       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.

EXAMPLES
       o   Show the NVMe over PCIe controller registers or the NVMe over
           Fabric controller properties in a binary format:

               # nvme show-regs /dev/nvme0 -o binary

       o   Show the NVMe over PCIe controller registers or the NVMe over
           Fabric controller properties in a human readable format:

               # nvme show-regs /dev/nvme0 -H

       o   Show the NVMe over PCIe controller registers or NVMe-oF controller
           properties in a json format:

               # nvme show-regs /dev/nvme0 -o json

NVME
       Part of the nvme-user suite

NVMe                              09/18/2026                     NVME-ID-NS(1)