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Keystone
3.0

Understand storage metrics and definitions in Keystone

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Learn the key terms Keystone STaaS uses to measure and report on your storage subscription, including capacity units, performance metrics, and availability definitions.

Metrics measurement

  • Capacity measurement in GiB, TiB, and PiB: Measurements of data storage capacity using base of 1024 (1 GiB = 10243 bytes, 1 TiB = 10244 bytes, and 1 PiB = 10245 bytes).

  • Operations counter chart in IOPS: The protocol operations per second, requested by the application.

  • Availability: Measured as a percentage of the number of I/O requests successfully responded to by the service, divided by total number of I/O requests made to the service. This is measured at the service demarcation in a month and does not include the scheduled service downtime or unavailability of the facilities, network, or other services provided by the customer.

  • Durability: Percentage of data accessed without loss of fidelity, excluding customer-caused deletion or corruption.

  • Latency: Time to service an I/O request received from a client, measured at the service demarcation (storage controller I/O port).