OCP documentation

OCP documentation

"OCP" here means the Open Compute Project's Datacenter NVMe SSD Specification. It defines vendor-specific log pages and Features on top of the base NVMe specification, for things a hyperscale datacenter needs that the base spec does not cover: extended SMART data, firmware activation history, latency monitoring, telemetry string logs, and more.

nvme-cli support

nvme-cli implements this specification in the nvme ocp plugin. It has more than two dozen subcommands, covering most of the logs and Features the specification defines. Run nvme ocp --help for the full list, or see the man pages under Documentation/nvme-ocp-*.txt in the nvme-cli source for each one.

Examples:

$ nvme ocp smart-add-log /dev/nvme0        # extended SMART log
$ nvme ocp latency-monitor-log /dev/nvme0  # latency monitor log
$ nvme ocp fw-activate-history /dev/nvme0

Specification links

• v1.0.3: https://www.opencompute.org/documents/nvme-cloud-ssd-specification-v1-0-3-pdf
• v2.0 r21: https://www.opencompute.org/documents/datacenter-nvme-ssd-specification-v2-0r21-pdf
• v2.5: https://www.opencompute.org/documents/datacenter-nvme-ssd-specification-v2-5-pdf
• v2.6.2: https://www.opencompute.org/documents/datacenter-nvme-ssd-specification-v2-6-2-pdf
• v2.7: https://www.opencompute.org/documents/datacenter-nvme-ssd-specification-v2-7-final-pdf-1

Each version is a full replacement of the previous one, not a diff. Check the revision history inside the PDF itself for what changed between versions.

OCP Storage Tech Talk

• 2024 OCP Storage Tech Talk: https://www.opencompute.org/events/past-events/2024-ocp-storage-tech-talk