Reliability

The ability of a system to deliver its required functionalities under stated conditions for a specified interval.

Availability

In the context of cloud computing one of the most common question is the one concerning availability of the resources stored remotely. Is the user able to download the data?

Continuity

Ability to continue performance of essential functions under a broad range of circumstances.

Durability

Ability to withstand a broad range of potential problems. The user should not be even aware of them.

Solutions

• redundancy,
• dispersion,
• spare parts,
• spare hardware,
• spare software,
• everything up-to-date,
• patches,
• spare connections,
• out-of-bound channels,
• spare site,
• backup,

Administrative approach

• well established procedures,
• plan B, plan C, . . . ,
• keep it simple,