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\pdf_title "MARS Manual"
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Multiversion Asynchronous Replicated Storage
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\begin_layout Author
Thomas Schöbel-Theuer (
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tst@1und1.de
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Version 0.1a-77
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Copyright (C) 2013-16 Thomas Schöbel-Theuer
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Copyright (C) 2013-16 1&1 Internet AG (see 
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http://www.1und1.de
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 shortly called 1&1 in the following).
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\size footnotesize
Permission is granted to copy, distribute and/or modify this document under
 the terms of the GNU Free Documentation License, Version 1.3 or any later
 version published by the Free Software Foundation; with no Invariant Sections,
 no Front-Cover Texts, and no Back-Cover Texts.
 A copy of the license is included in the section entitled 
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.
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\begin_layout Abstract

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 MARS
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 is a block-level storage replication system for long distances / flaky
 networks under GPL.
 It runs as a Linux kernel module.
 The sysadmin interface is similar to DRBD
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status open

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Registered trademarks are the property of their respective owner.
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, but its internal engine is completely different from DRBD: it works with
 
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transaction logging
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, similar to some database systems.
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Therefore, MARS can provide stronger 
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consistency guarantees
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.
 Even in case of network bottlenecks / problems / failures, the secondaries
 may become outdated (reflect an elder state), but never become inconsistent.
 In contrast to DRBD, MARS preserves the 
\series bold
order of write operations
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 even when the network is flaky (
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Anytime Consistency
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).
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The current version of MARS supports 
\begin_inset Formula $k>2$
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 replicas and works 
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asynchronously
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.
 Therefore, application performance is completely decoupled from any network
 problems.
 Future versions are planned to also support synchronous or near-synchronous
 modes.
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MARS supports a new method for building Cloud Storage / Software Defined
 Storage, called 
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LV Football
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.
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It comes with some automation scripts, leading to a similar functionality
 than Kubernetes, but devoted to stateful LVs over 
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virtual LVM pools
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 in the petabytes range.
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