Architecture comparison matrix. Read this if you have not yet decided between dedicated servers, colocation, virtualised hosting, private cloud and public cloud. It compares them against the requirements that usually decide the choice, and shows how to weight them for your own priorities. It takes a few minutes and is the best first page for a buyer.
Migration readiness planner. Use this if a move is already likely. It turns your own figures into a readiness level, worked transfer arithmetic, risks and a cutover checklist. It is a questionnaire, and has not examined your systems.
Choosing an architecture
Dedicated servers. For infrastructure managers weighing bare metal against colocation, virtualised hosting and public cloud. Read it when you need criteria for when single-tenant hardware earns its cost, and a list of what you inherit by choosing it.
Virtualisation. For anyone consolidating onto shared hosts or reviewing an estate that has grown. Read it for the capacity arithmetic that decides whether a cluster survives a host failure, and for the licensing patterns that change the bill.
Private cloud. For anyone offered a private cloud, or asked for cloud-like infrastructure. Read it for a definition you can test, and for an honest account of elasticity on a fixed pool.
Windows and Linux hosting. For estates that mix operating systems. Read it for licensing arithmetic, support lifecycles and the differences that break during a move.
Moving
Server migration. For whoever owns a migration, or must question the people doing it. Read it before choosing a method and a date, because it covers discovery, dependency mapping, transfer arithmetic, DNS strategy, cutover and rollback.
Protecting and running
Backup, high availability and disaster recovery. For directors who have been told it is all replicated, or that backups exist. Read it to separate three different promises and to calculate whether your restore time meets your recovery objective.
Managed infrastructure. For buyers deciding what to hand to a supplier. Read it before signing, for a layer-by-layer responsibility table, supplier due-diligence questions, how to read an availability figure, and how to plan the exit.
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