NVME-GET-PROPERTY(1) NVMe Manual NVME-GET-PROPERTY(1)

nvme-get-property - Reads and shows the defined NVMe controller property for NVMe over Fabric

nvme get-property <device> [--offset=<offset> | -O <offset>]
                        [--human-readable | -H]
                        [--output-format=<fmt> | -o <fmt>] [--verbose | -v]
                        [--timeout=<timeout> | -t <timeout>]

Reads and shows the defined NVMe controller property for NVMe over Fabric.

-O <offset>, --offset=<offset>

The offset of the property. One of CAP=0x0, VS=0x8, CC=0x14, CSTS=0x1c, NSSR=0x20

-H

--human-readable: Show the fields packed in the property

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

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

-v, --verbose

Increase the information detail in the output.

-t <timeout>, --timeout=<timeout>

Override default timeout value. In milliseconds.

•The following will run the get-property command with offset 0 
# nvme get-property /dev/nvme0 --offset=0x0 --human-readable

Currently the CAP value is truncated to 32 bits due to a limitation in the ioctl interface.

In a recent enough kernel, the 64 bit value is shown in kernel traces.

•First enable traces by this command 
# echo 1 > /sys/kernel/debug/tracing/events/nvme/enable
•Then look for NVMe Fabrics command (0x7f) at trace 
/sys/kernel/debug/tracing/trace

Part of the nvme-user suite

11/16/2024 NVMe