mirror of https://github.com/schoebel/mars
arch-guide: new section on geo-redundancy
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@ -1286,6 +1286,184 @@ typically
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extremely quick automatic repair methods, self-healing systems, etc.
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\end_layout
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\begin_layout Section
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What is Geo-Redundancy
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\begin_inset CommandInset label
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LatexCommand label
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name "sec:What-is-Geo-Redundancy"
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\end_inset
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\end_layout
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\begin_layout Standard
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From the technical viewpoint of HA, geo-redundancy belongs to the
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\emph on
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solution space
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\emph default
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.
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From the viewpoint of
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\series bold
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government authorities
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\series default
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, and/or from
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\series bold
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owners
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\series default
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of a company / rating agencies determining the
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\series bold
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business risk
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\series default
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and the
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\series bold
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stock exchange value
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\series default
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of a company, it is also a
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\emph on
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requirement
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\emph default
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.
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\end_layout
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\begin_layout Standard
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Geo-redundancy means that the
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\series bold
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risk
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\series default
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of certain types of geo-localized
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\series bold
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physical impacts
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\series default
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, such as earthquakes, floods, terrorist attacks, mass power outage, etc,
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must be
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\series bold
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compensated
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\series default
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by being able to run at least the
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\series bold
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core business
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\series default
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from another geo-location within some reasonable timeframe.
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\end_layout
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\begin_layout Standard
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\noindent
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\begin_inset Graphics
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filename images/lightbulb_brightlit_benj_.png
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lyxscale 12
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scale 7
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\end_inset
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Notice that requirements can be solved differently.
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This guide explains ways for both
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\series bold
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cost reduction
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\series default
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and
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\series bold
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risk reduction
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\series default
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at the same time, by
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\emph on
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combining
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\emph default
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HA requirements with geo-redundancy requirements in a clever way, such
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that the combined solution will meet both at the same time.
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A resulting combined solution is called
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\series bold
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Football on top of MARS
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\series default
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.
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It provides additional operational value, such as load balancing via the
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\series bold
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ability for butterfly
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\series default
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, see section
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\begin_inset CommandInset ref
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LatexCommand nameref
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reference "subsec:Flexibility-of-Failover"
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plural "false"
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caps "false"
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noprefix "false"
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\end_inset
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.
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\end_layout
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\begin_layout Standard
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There are some ongoing political discussions about detail requirements for
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geo-redundancy.
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The mimimum distance requirement between suitable geo-locations is seen
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differently by different interest groups, and even differently in different
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countries.
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Background are the
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\series bold
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enormous cost
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\series default
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for setup of a datacenter.
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\end_layout
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\begin_layout Standard
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\begin_inset ERT
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status open
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\begin_layout Plain Layout
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\backslash
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sloppy
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\end_layout
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\end_inset
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While some NGOs = Non-Governmental Organizations are fighting for a minimum
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distance of only 5 km, the German government authority BSI recommends a
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minimum distance of 200 km between datacenters for
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\series bold
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critical infrastructures.
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\series default
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See
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\begin_inset Flex URL
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status open
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\begin_layout Plain Layout
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https://www.bsi.bund.de/SharedDocs/Downloads/DE/BSI/Sicherheitsberatung/Standort-Kr
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iterien_HV-RZ/Standort-Kriterien_HV-RZ.pdf?__blob=publicationFile&v=5
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\end_layout
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\end_inset
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.
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Although this is only a
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\begin_inset Quotes eld
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\end_inset
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recommendation
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\begin_inset Quotes erd
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\end_inset
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officially, certain sectors like
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\series bold
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banking
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\series default
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are actually forced to treat this more or less like a requirement.
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\end_layout
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\begin_layout Standard
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For an observer, it could be interesting how
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\emph on
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international requirements
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\emph default
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will evolve, and how rating agencies will change their rules during the
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course of the next decades.
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\end_layout
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\begin_layout Section
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What is
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\emph on
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