Viewing Per-Tenant Block Storage Usage in OpenStack

Problem

How to retrieve per-tenant (project-wise) block storage usage in OpenStack using CLI, including total provisioned volume size summaries.

Info

There's no direct openstack CLI command that gives tenant-wise volume size summary.

Environment

• Platform9 Managed OpenStack - All Versions

• Cinder

Procedure

1. Install SDK.

Install SDK

$ pip3 install openstacksdk

1. Export admin.rc file.

export admin.rc

$ source admin.rc

1. Script: Per-Tenant Provisioned Storage Usage.

Python Script

import openstack

conn = openstack.connect()

# Build a map of project_id -> project name
project_names = {p.id: p.name for p in conn.identity.projects()}

usage = {}

# Collect provisioned volume sizes
for vol in conn.block_storage.volumes(details=True, all_projects=True):
    pid = vol.project_id
    usage[pid] = usage.get(pid, 0) + vol.size  # size in GB

# Print output
print(f"{'Project':<20} {'Provisioned (GB)':>16}")
for pid, size in sorted(usage.items()):
    name = project_names.get(pid, pid[:8])  # fallback to short ID
    print(f"{name:<20} {size:>16}")

1. Run the Script.

Bash

$ python3 volume_usage_by_project.py

• Sample output:

bash

$ python3 volume_usage_by_project.py

Project              Provisioned (GB)
admin                           320
services                        150
demo                            200

Additional Information

• This script reports provisioned sizes (logical volume size), not actual allocated backend usage.

• Most OpenStack backends (e.g., Ceph, LVM, HPE 3PAR, NFS) do not expose physical allocation per volume unless the driver supports it.

• Modify the script to include volume count, volume type, or export to CSV.