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Optimizing Cloud Migration: Performance Lessons for the Enterprise

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Routing The geographical location is of course only part of the story. Cloud providers don't own a worldwide network; they rely on transit providers to connect cloud locations to markets. So, it is also essential that the cloud provider has appropriate routing in and out of the geographical location. For example, if your users are in Indonesia, a cloud provider based in Singapore would seem appropriate, but that would be undermined if upon fur‐ ther investigation it turned out that they routed all traffic from Indonesia via Los Angeles. While it sounds absurd, this is a gen‐ uine example of the sort of routing that can exist, and similar examples are not uncommon. Resiliency It is important to understand the level of resiliency that is being offered in a particular cloud region. Cloud providers will pro‐ vide multiple physical data centers in a region and allow for automatic distribution of services across these data centers. Key Concept—The Nature of Buying Has Changed Previously, the buying process was about descriptions of the capa‐ bilities of service provision backed by service-level promises. ISPs would generally be open about the nature of connectivity they had in place and would be willing to work with you to improve that in bespoke ways if necessary. Cloud providers are typically very reticent about sharing any details of the nature and levels of resilience they have in connectivity, focusing their SLAs on the services that they provide rather than the level of connectivity to specific markets. This is partly because it is not part of their stated services and partly because they cannot own or control the entire path to every market. This leaves the responsibility for ensuring the level and quality of connectivity with you. It is essential, therefore, that you put effective monitoring in place (see "4. Build a Comprehensive Monitoring Solution" on page 15). Understanding the nature of the geographic distribution of cloud providers enables you to start making an informed choice about which will be the best provider for your service to minimize latency (of course, latency will only be one element considered when decid‐ 6 | Phase 1: Preparing for Your Journey to the Cloud

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