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<span class="version">5.3.0</span>
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<div class="section" id="set-up-local-waveform-archiving">
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<span id="tutorials-archiving"></span><h1>Set up local waveform archiving<a class="headerlink" href="#set-up-local-waveform-archiving" title="Permalink to this headline">¶</a></h1>
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<p>You will …</p>
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<ul class="simple">
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<li><p>Set up <a class="reference internal" href="../../apps/slarchive.html#slarchive"><span class="std std-ref">slarchive</span></a> with its necessary bindings</p></li>
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<li><p>Set up <cite>purge_datafiles</cite> in crontab</p></li>
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</ul>
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<p>Pre-requisites for this tutorial:</p>
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<ul class="simple">
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<li><p>Have SeisComP installed</p></li>
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<li><p>Tutorial on <a class="reference internal" href="addstation.html#tutorials-addstation"><span class="std std-ref">adding a new station</span></a></p></li>
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<li><p>Tutorial on <a class="reference internal" href="geofon_waveforms.html#tutorials-geofon-waveforms"><span class="std std-ref">real-time data acquisition</span></a>
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so that you have local data for GE stations.
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Alternatively you may already obtain real-time waveform data from
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somewhere else (see <a class="reference internal" href="waveforms.html#tutorials-waveforms"><span class="std std-ref">Get real-time data from a remote Seedlink server (single station)</span></a>).</p></li>
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</ul>
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<p>Afterwards/Results/Outcomes:</p>
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<ul class="simple">
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<li><p>Save real-time data in a local archive for later processing.</p></li>
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<li><p>See <a class="reference internal" href="../glossary.html#term-miniseed"><span class="xref std std-term">miniSEED</span></a> day files for GE stations in your local <a class="reference internal" href="../concepts/waveformarchives.html#concepts-waveformarchives"><span class="std std-ref">waveform archive</span></a>.</p></li>
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</ul>
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<p>Time range estimate:</p>
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<ul class="simple">
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<li><p>5 minutes</p></li>
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</ul>
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<p>Related tutorial(s):</p>
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<ul class="simple">
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<li><p>Tutorial on <a class="reference internal" href="servefdsnws.html#tutorials-servefdsnws"><span class="std std-ref">Enable local FDSNWS server</span></a></p></li>
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<li><p>Tutorial on <a class="reference internal" href="waveformplayback.html#tutorials-waveformplayback"><span class="std std-ref">Play back archived waveforms</span></a></p></li>
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</ul>
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<hr class="docutils" />
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<p><strong>Motivation</strong>:
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Without activating archiving, your local Seedlink server
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will only keep waveforms for a short time.
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This makes it hard to review old events, for example.</p>
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<p>In this example, we’ll arrange for keeping waveforms for one week.
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Before starting, you’ll need bindings for your stations;
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see the tutorials <a class="reference internal" href="geofon_waveforms.html#tutorials-geofon-waveforms"><span class="std std-ref">Add real-time stations from GEOFON</span></a>
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or <a class="reference internal" href="waveforms.html#tutorials-waveforms"><span class="std std-ref">Get real-time data from a remote Seedlink server (single station)</span></a>.</p>
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<p>The <strong class="program">slarchive</strong> collects data and archives it
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locally using a <a class="reference internal" href="../glossary.html#term-sds"><span class="xref std std-term">SDS</span></a> file system structure of
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nested subdirectories and systematically named files.</p>
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<div class="section" id="in-scconfig">
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<h2>In scconfig<a class="headerlink" href="#in-scconfig" title="Permalink to this headline">¶</a></h2>
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<ol class="arabic">
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<li><p>Under the Modules tab, go to Acquisition, and select <strong class="program">slarchive</strong>.
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Here you can see the default parameters used.
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By default, <strong class="program">slarchive</strong> connects to your local Seedlink server,
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and archives to your local disk.</p></li>
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<li><p>Under the System tab, select the line for <strong class="program">slarchive</strong>, and click
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“Enable module(s)” button at the top.</p></li>
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<li><p>Under Bindings:
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On RHS right-click “slarchive” to add an slarchive profile.
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Name it ‘week’, to keep waveforms for 7 days, and click ‘Ok’.
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The new profile appears in the (bottom right corner of <strong class="program">scconfig</strong>.
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Double click on the profile to open its settings.
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Unlock the box labeled “keep”, and change the default from 30 to 7.</p>
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<p>Once you have a binding profile, drag it over all the stations it
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should apply to, under “Networks” on the left-hand side of the
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bindings tool.</p>
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</li>
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</ol>
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<div class="admonition warning">
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<p class="admonition-title">Warning</p>
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<p>The name ‘week’ is just a label.
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Its functionality comes from changing the value of the <cite>keep</cite> parameter.
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Changing the <em>name</em> of a binding profile does not change its function.</p>
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</div>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p>You can also choose which channels should be archived,
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using the “<a class="reference internal" href="../../apps/slarchive.html#confval-selectors"><code class="xref std std-confval docutils literal notranslate"><span class="pre">selectors</span></code></a>” box.
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For instance, you may collect data at several sample rates,
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and only wish to archive the highest rate.
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If you collect LH, BH, HH streams at 0.1, 20, and 100 samples
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per second, respectively, you might retain only the HH streams,
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by setting “<a class="reference internal" href="../../apps/slarchive.html#confval-selectors"><code class="xref std std-confval docutils literal notranslate"><span class="pre">selectors</span></code></a>” to “HH”.</p>
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</div>
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<ol class="arabic simple">
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<li><p>Then return to System, and click ‘Update configuration’.
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Make sure the <strong class="program">slarchive</strong> module, or no module, is selected.</p></li>
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<li><p>Restart <strong class="program">slarchive</strong>.</p></li>
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<li><p>Adjust the <a class="reference internal" href="../concepts/recordstream.html#concepts-recordstream"><span class="std std-ref">RecordStream</span></a> for making use of the archived waveforms
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from within a <a class="reference internal" href="../glossary.html#term-gui"><span class="xref std std-term">GUI</span></a> or automatic data processing modules.</p></li>
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</ol>
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</div>
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<div class="section" id="command-line">
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<h2>Command line<a class="headerlink" href="#command-line" title="Permalink to this headline">¶</a></h2>
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<p>You will need to edit each of your top-level key files to refer to
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a new binding profile.
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e.g.:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ cd ~/seiscomp/etc/key
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$ vi station_GR_CLL
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</pre></div>
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</div>
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<p>Add the line <cite>slarchive:week</cite> to whatever lines are already there.
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Afterwards it will look something like this:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1"># Binding references</span>
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<span class="k">global</span><span class="p">:</span><span class="n">BH</span>
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<span class="n">scautopick</span><span class="p">:</span><span class="n">default</span>
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<span class="n">seedlink</span><span class="p">:</span><span class="n">geofon</span>
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<span class="n">slarchive</span><span class="p">:</span><span class="n">week</span>
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</pre></div>
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</div>
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<p>Repeat this for the top-level key file of each station
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you wish this binding to apply to.
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Now create the binding profile in the key directory.
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This is a file with a name corresponding to the binding profile name; here: ‘week’</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ cd ~/seiscomp/etc/key
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$ mkdir slarchive
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$ vi slarchive/profile_week
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# Number of days the data is kept in the archive. This requires purge_datafile
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# to be run as cronjob.
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keep = 7
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$ seiscomp enable slarchive
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$ seiscomp update-config slarchive
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$ seiscomp restart slarchive
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slarchive is not running
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starting slarchive
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</pre></div>
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</div>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p>Left unattended, your disk will eventually fill up with archived data.
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To prevent this you will need a script like <cite>purge_database</cite>,
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which is provided with SeisComP.
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This can be run once per day using the <cite>cron</cite> feature of your system.
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The command:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ seiscomp print crontab
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</pre></div>
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</div>
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<p>will print a number of lines to the terminal.
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Type <cite>crontab -e</cite> and insert these lines into the crontab file for your
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user (typically <cite>sysop</cite>).
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Exit your crontab editor.
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Displaying your crontab should now show a line for <cite>purge_database</cite>.:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ crontab -l
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20 3 * * * /home/sysop/seiscomp/var/lib/slarchive/purge_datafiles >/dev/null 2>&1
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[There may be other lines too.]
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</pre></div>
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</div>
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<p>This shows you that the <cite>purge_datafiles</cite> script
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will run every day at 3:20 a.m.</p>
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</div>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p>If you examine the <cite>purge_datafiles</cite> script, you will see that all it does
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is look for files with a last modified time older than a certain number
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of days ago.
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The number of days to keep can be set station-by-station using the
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ARCH_KEEP feature.
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A convenient way to do this for many stations is with
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multiple binding profiles, one for each length of time desired.</p>
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</div>
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</div>
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<div class="section" id="checking-archiving-is-functioning">
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<h2>Checking archiving is functioning<a class="headerlink" href="#checking-archiving-is-functioning" title="Permalink to this headline">¶</a></h2>
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<ul>
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<li><p>If <strong class="program">seedlink</strong> is configured correctly, a new station’s streams
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appears in output from <strong class="program">slinktool</strong>:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ slinktool -Q : | grep CLL
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GR CLL HHZ D 2020/04/01 01:11:57.6649 - 2020/04/01 07:28:49.0299
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GR CLL HHE D 2020/04/01 01:11:57.6649 - 2020/04/01 07:28:45.0299
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GR CLL HHN D 2020/04/01 01:11:57.6649 - 2020/04/01 07:28:39.2299
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</pre></div>
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</div>
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<p>This shows three streams being acquired from station ‘CLL’.
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The second time shown is the time of the most recent data for each stream.</p>
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</li>
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<li><p>If <strong class="program">slarchive</strong> is configured correctly, waveform data for the
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station appears in <strong class="program">slarchive</strong>’s SDS archive directory:</p>
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<blockquote>
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<div><div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>$ ls -l seiscomp/var/lib/archive/2020/GR/CLL
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total <span class="m">12</span>
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drwxr-xr-x <span class="m">2</span> user user <span class="m">4096</span> Apr <span class="m">1</span> <span class="m">06</span>:30 HHE.D
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drwxr-xr-x <span class="m">2</span> user user <span class="m">4096</span> Apr <span class="m">1</span> <span class="m">06</span>:30 HHN.D
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drwxr-xr-x <span class="m">2</span> user user <span class="m">4096</span> Apr <span class="m">1</span> <span class="m">06</span>:30 HHZ.D
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$ ls -l seiscomp/var/lib/archive/2020/GR/CLL/HHZ.D/
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total <span class="m">12728</span>
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-rw-r--r-- <span class="m">1</span> user user <span class="m">5492224</span> Mar <span class="m">31</span> <span class="m">00</span>:04 GR.CLL..BHZ.D.2020.090
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-rw-r--r-- <span class="m">1</span> user user <span class="m">7531008</span> Apr <span class="m">1</span> <span class="m">00</span>:03 GR.CLL..BHZ.D.2020.091
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</pre></div>
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</div>
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<script>$('#searchbox').show(0);</script>
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<h3><a href="../../index.html">Table of Contents</a></h3>
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<ul>
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<li><a class="reference internal" href="#">Set up local waveform archiving</a><ul>
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<li><a class="reference internal" href="#in-scconfig">In scconfig</a></li>
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<li><a class="reference internal" href="#command-line">Command line</a></li>
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<li><a class="reference internal" href="#checking-archiving-is-functioning">Checking archiving is functioning</a></li>
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<p class="topless"><a href="waveforms.html"
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title="previous chapter">Get real-time data from a remote Seedlink server (single station)</a></p>
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