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doc: improve README

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Thomas Schoebel-Theuer 2013-01-31 21:33:46 +01:00
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README
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@ -10,18 +10,24 @@ MARS Light is almost a drop-in replacement for DRBD
(that is, block-level storage replication).
In contrast to plain DRBD, it works _asynchronously_ and over
arbitrary distances. It uses very different technology under the
arbitrary distances. My regular testing runs between datacenters
in the US and Europe. MARS uses very different technology under the
hood, similar to transaction logging of database systems.
Reliability: application and replication are completely decoupled.
Networking problems (e.g. packet loss, bottlenecks) have no
impact onto your application at the primary side.
Anytime consistency: on a secondary node, its version of the
block device is always consistent in itself, but may be outdated
(represent a former state from the primary side). Thanks to
incremental replication of the transaction logfiles, usually the
lag-behind will be only a few seconds, or parts of a second.
Application and replication are completely decoupled.
Networking problems (e.g. packet loss) have no
impact onto your application at the primary side.
Synchronous or near-synchronous operating modes are planned for
the future, but are expected to _reliably_ work only over short
distances (less than 50km), due to fundamental properties
of the network.
WARNING! Current stage is BETA. Don't put productive data on it!