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| <h1 id="bad-disk-troubleshooting">Bad disk troubleshooting</h1> |
| |
| <p>When a disk failure occurs, it can be checked by the following methods:</p> |
| |
| <ul> |
| <li>In the Replica Server logs, an <code class="language-plaintext highlighter-rouge">IO error</code> was found for a certain disk</li> |
| <li>It is possible that the latency of a certain server is significantly higher than that of other servers. Continuing to investigate, if it is found that the <em>IO wait</em> of a certain disk is significantly higher, it basically proves that the disk is a <em>slow disk</em></li> |
| </ul> |
| |
| <h1 id="bad-disk-blacklist">Bad disk blacklist</h1> |
| |
| <p>Pegasus supports <em>disk black list</em>, if you want to take a bad disk offline, firstly, define it in the <em>disk black list</em> file on the Replica Server where it is located, the file path is determined by the configuration:</p> |
| |
| <div class="language-ini highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nn">[replication]</span> |
| <span class="py">data_dirs_black_list_file</span> <span class="p">=</span> <span class="s">/home/work/.pegasus_data_dirs_black_list</span> |
| </code></pre></div></div> |
| |
| <p>Then log in to the corresponding server and edit the file, for example, disable <code class="language-plaintext highlighter-rouge">ssd2</code> and <code class="language-plaintext highlighter-rouge">ssd3</code>:</p> |
| <pre><code class="language-txt">/home/work/ssd2 |
| /home/work/ssd3 |
| </code></pre> |
| |
| <h2 id="restart-service">Restart service</h2> |
| |
| <p>After marking the black list of bad disks, a restart is required to take effect. It is recommended to restart the Replica Server process on the corresponding server through <a href="rolling-update#high-availability-restart-steps">High availability restart steps</a>.</p> |
| |
| <p>After restarting, the following records can be found in the server log, indicating that the disks marked in the black list have taken effect:</p> |
| |
| <pre><code class="language-log">data_dirs_black_list_file[/home/work/.pegasus_data_dirs_black_list] found, apply it |
| black_list[1] = [/home/work/ssd2/] |
| black_list[2] = [/home/work/ssd3/] |
| </code></pre> |
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| appId: 'QRN30RBW0S', |
| indexName: 'pegasus-apache', |
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