Another concern hindering migration into a public cloud is lack of
availability and reliability guarantees.
Well-known cloud providers have experienced temporary lack of availability lasting at least several hours
11,21
and
striking loss of personal customer data,
most notably the 2011 T-Mobile/Sidekick incident.
23
Traditional reliability
models for hardware make certain assumptions about failure patterns (such
as independence of failures among
hard drives) that are not accurate in
the world of cloud computing. Without novel data-reliability protections