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

IOPS/TiB. The protocol operations per second requested by the application divided by the allocated logical size of the volume.

Availability is measured as a percentage of number of I/O requests successfully responded to by the service, divided by total number of I/O requests made of the service, measured at the service demarcation, in a given month, not including scheduled service downtime or unavailability of required facilities, network or other services to be provided by customer.

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

Target IOPS per TiB. The guaranteed IOPS for all I/O requests made to a volume before the target IOPs per TiB threshold is reached. Performance on the volume is capped at the selected IOPS per TiB.

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