Package: wnpp Severity: wishlist X-Debbugs-CC: debian-de...@lists.debian.org
Package name: mars-dkms
Version: 0.1.09
Upstream Author: Thomas Schoebel-Theuer <t...@1und1.de>
URL: http://schoebel.github.io/mars/
License: GPL-2+, GFDL-1.3+
Description: Asynchronous Block-Level Storage Replication
MARS can be used to replicate Linux-based storage devices, or even whole
datacenters, over arbitrary distances (geo-redundancy).
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Main features:
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Anytime Consistency
Arbitrary Distances
Tolerates Flaky Networks
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MARS Light is almost a drop-in replacement for DRBD (block-level storage
replication). It runs as a Linux kernel module.
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In contrast to plain DRBD, it works asynchronously and over arbitrary
distances. Our internal 1&1 testing runs between datacenters in the US and
Europe. MARS uses very different technology under the hood, similar to
transaction logging of database systems.
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Reliability: application and replication are completely decoupled. Networking
problems (e.g. packet loss, bottlenecks) have no impact onto your application
at the primary side.
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Anytime Consistency: on a secondary node, its version of the underlying disk
device is always consistent in itself, but may be outdated (represent a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.
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Synchronous or near-synchronous operating modes are planned for the future,
but are expected to work reliably only over short distances (less than 50km),
due to fundamental properties of distributed systems.
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