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Framework and requirements for cloud computing 1

Table II.10 – High reliability deployment – use case
Title A use case for high reliability deployment

Description This use case covers the situation where physical machine will be deployed with high
reliability. To achieve high reliability, physical machine needs to be deployed with redundant
main components, such as CPU, power supply and cooling component. In addition, physical
machine needs to support technology to reduce data errors and data loss at work, such as
memory error correction and RAID.
Trough RAID technology, data of physical machine is distributed across multiple drives in
different ways, referred to as RAID levels, depending on the required level of redundancy and
performance. Take RAID1 as an example, as shown in below figure, RAID 1 consists of an
exact copy (or mirror) of a set of data on two or more disks. The data of physical machine will
not loss so long as at least one member drive is operational.
Roles/sub-roles CSP: cloud service operations manager
Figure

Pre-conditions CSP wishes to deploy physical machines with high reliability.
(optional)
Post-conditions Physical machines can still work when some components fail. The physical machine can
(optional) reduce data errors and losses due to memory and storage failures.
Derived – Multiple CPUs (see clause 7.1.1.1)
requirements – Memory reliability (see clause 7.1.1.2)
– Storage redundancy hardware (see clause 7.1.1.3)
– Supporting power redundancy (see clause 7.1.2)
– Cooling component redundancy(see clause 7.1.3)

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