An HDS migration consists of transferring an application and its healthcare data from one hosting provider to another while maintaining the required certification and service continuity. When properly planned and executed, the perceived interruption can be reduced to a simple DNS switch. For example, when Madietenligne, a provider of an e-health solution for dietitians, migrated to Clever Cloud, its test and production environments were moved in less than fifteen days, covering 500 GB of data, with no downtime perceived by users.

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Some of the most interesting reliability work in distributed systems starts with a simple idea: if a system can fail in production because of time, scheduling, networking, or unlucky interleavings, then those forces should be brought into tests under control.