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<span class="date">10 January</span> <span> / </span>
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<a href="https://github.com/changchichung" title="Posts by Eric Chang" rel="author">Eric Chang</a>
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<h1 class='entry-title'> [筆記] 第一次玩 Synology High Availability / first try synology high availability</h1>
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<article>
<p>上禮拜,原本擔任 proxmox cluster 的主要 storage 的 ds415+ 掛點了</p>
<p>原因應該就是之前的 intel c2000 series cpu 的 bug</p>
<p>只是不知道為什麼這台兩三年來都沒有關機的NAS</p>
<p>比其他三台多撐了那麼久 (已經有兩台送修回來,一台也是同樣症狀,被放在一邊)</p>
<p>趁著這次機會,看看網路上說的換電阻大法有沒有用!</p>
<p>如果有用,就拿這兩台來玩玩 synology high availability !</p>
<p>先要感謝這一篇的作者!</p>
<p><a href="https://www.mobile01.com/topicdetail.php?f=494&amp;t=5600042">https://www.mobile01.com/topicdetail.php?f=494&amp;t=5600042</a></p>
<p>在網路上訂了一大包的 <sup>1</sup>&frasl;<sub>4</sub> w 100Ω 的電阻 (100個才70塊運費都要60了)</p>
<p>照著上面那篇的作法把電阻焊上去NAS就順利開機了</p>
<p>__</p>
<p>架構圖很簡單,只是在做測試而已,又是第一次玩,先不要搞得太複雜</p>
<p><img src="https://i.imgur.com/k7IDZ4Y.png" alt="" /></p>
<p>流程大致如下</p>
<p>設定好NAS Cluster 之後建立NFS 服務</p>
<p>然後在proxmox 主機上掛載這個NFS 空間</p>
<p>接著在proxmox 上建立一台 VM 存放在NFS 空間上</p>
<p>在這台VM裡面持續 ping NAS cluster VIP 192.168.11.85</p>
<p>接著拔掉 192.168.11.87 的兩條網路線模擬NAS cluster 的主伺服器掛點的狀況</p>
<p>這時候VM 還活著,可以正常建立、刪除、檢視檔案,然後 ping 192.168.11.85 也還持續著</p>
<p>NAS的告警信件也正常發出</p>
<p>08:53 NAS High Availability 叢集 ds415cluster 已執行自動故障轉移。 [詳細資訊:無法偵測到 hqs087 (主伺服器)]
08:58 NAS High Availability 叢集 ds415cluster 狀態異常 [詳細資訊:無法偵測到 hqs087 (副伺服器)]</p>
<p>9:08 接回hqs087的網路線</p>
<p>9:09 收到信件 NAS High Availability 叢集 ds415cluster 停止正常運作 [詳細資訊Split-brain 錯誤]</p>
<p>登入管理界面(192.168.11.85:5000) ,操作 HA ,選擇恢復</p>
<p>這時候開始VM 的檔案系統變成是 read only</p>
<p>雖然還活著,但是已經無法建立、刪除檔案,連 cat /var/log/syslog 也會卡住</p>
<p>9:14 VIP NAS cluster 恢復連線,本來卡住的 cat /var/log/syslog 也可以正常顯示內容了</p>
<p>但是系統還是 read onlyreboot VM 之後才恢復正常。</p>
<p>有幾個問題</p>
<ul>
<li>split brain 錯誤</li>
</ul>
<p>這個問題我想應該是因為只有兩台組成clsuter 造成的</p>
<p>如果有第三臺加入應該就不會有這個split brain 的問題</p>
<ul>
<li>VM變成 read only</li>
</ul>
<p>這個我就不知道為什麼了照理說NAS Cluster 已經開始在恢復</p>
<p>在我的觀念裡,應該要能夠「正常」的持續服務</p>
<p>但是VM變成 read only ,而且必須要重新開機才能解決</p>
<p>那這樣NAS Cluster 等於沒有太大作用呀..</p>
<p>來問問看群暉客服好了</p>
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