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| <div class="content"> |
| <h1 id="坏盘故障排查">坏盘故障排查</h1> |
| |
| <p>磁盘故障时有发生，可通过以下方法检查：</p> |
| |
| <ul> |
| <li>在 Replica Server 日志中，发现有某块磁盘的 IO error 错误</li> |
| <li>可能是某节点的延迟明显高于其他节点，继续排查，如果发现某个磁盘的 IO await 明显较高，那基本证明该磁盘是 <em>慢盘</em></li> |
| </ul> |
| |
| <h1 id="坏盘黑名单">坏盘黑名单</h1> |
| |
| <p>Pegasus 支持 <em>磁盘黑名单</em>，如果要将坏盘下线，首先要把它定义在其所在 Replica Server 的 <em>黑名单文件</em> 中，黑名单文件所在路径根据配置决定：</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>然后登录对应服务器，编辑该文件，例如标注磁盘 ssd2 和 ssd3 需要禁用：</p> |
| <pre><code class="language-txt">/home/work/ssd2 |
| /home/work/ssd3 |
| </code></pre> |
| |
| <h2 id="重启服务">重启服务</h2> |
| |
| <p>在标注了坏盘名单后，需要重启使其生效。建议通过 <a href="rolling-update#高可用重启">高可用重启</a> 对应服务器上的 Replica Server 进程。</p> |
| |
| <p>重启后，可以在程序日志中能够发现如下记录，表示黑名单内标记的磁盘生效了：</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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