Capacity (GiB, TiB, PiB)

Data storage capacity is measured using powers of 1024: 1 GiB = 1024³ bytes, 1 TiB = 1024⁴ bytes, and 1 PiB = 1024⁵ bytes.

IOPS

IOPS (I/O operations per second) is the number of protocol operations per second requested by the application. IOPS is displayed in the operations counter chart on the Keystone dashboard.

Availability

Availability is the percentage of I/O requests successfully responded to by the service out of the total I/O requests made in a month. 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

Durability is the percentage of data that can be accessed without loss of fidelity, excluding customer-caused deletion or corruption.

Latency

Latency is the time to service an I/O request received from a client, measured at the service demarcation point (storage controller I/O port).