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introduction.html
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<!DOCTYPE html>
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<h1 class="dd-title">Storage Instantiation Daemon</h1>
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<p>Latest Revision: <a href="#change-record"></a></p>
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<div class="section" id="introduction">
<h1>Introduction<a class="headerlink" href="#introduction" title="Permalink to this headline">¶</a></h1>
<p>Storage Instantiation Daemon (SID) is a project that aims to help with
Linux storage device state tracking that encompasses device layers, groups
and whole stacks by monitoring progression of events. Based on monitored
states and further recorded information, it is able to trigger associated
actions for well-defined triggers, including activation and deactivation of
devices and their layers in the stack.</p>
<p>SID positions itself on top of <em>udev</em>, reacting to <em>uevents</em>. It is closely
interlinked and cooperating with <em>udev daemon</em>. The udev daemon is enhanced
with specialized <em>sid</em> udev builtin command that is used to communicate
with SID. SID also listens to <em>udev uevents</em> issued by udev daemon which in
turn triggers further processing.</p>
<p>At its core, SID provides an <em>infrastructure</em> and an <em>API</em> for various
device subsystems to create <em>modules</em> that handle specific device types and
their abstractions. For this purpose, it organizes overall uevent
processing into <em>discrete and controlled steps</em> and, through an API, it
provides access to its own <em>SID database</em> for use within core parts as well
as modules to store and retrieve extended information besides udev daemon’s
database capabilities.</p>
<p>The SID database contains both <em>internal</em> and <em>general-purpose records</em>.
The internal records are accessed only through dedicated API calls which
are used to track and support device dependencies, grouping, triggers and
associated actions. The general-purpose records can be stored and retrieved
by modules directly with a possibility to define their <em>key components</em>,
<em>scope of visibility</em> and <em>access type</em>.</p>
<p>Since SID keeps track of the overall storage device stack and grouping, it
provides an insight into the stack, the device and group dependencies and
it is able to notify when there are changes to certain parts of the device
stack to which there needs to be an appropriate action executed either
inside (using SID’s triggers and associated actions) or outside SID itself
(using <em>extended notifications</em> that SID sends out).</p>
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