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東港計畫（二）：用虛擬主機 (VPS) 挖礦的後續發展 by hashray

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東港計畫（二）：用虛擬主機 (VPS) 挖礦的後續發展
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<a href="https://4.bp.blogspot.com/-XynqxSp_eYM/Wij2EghYbPI/AAAAAAAAAHU/vPozJHsLkhExZX3TvN_7YVA5VkBduQKcwCLcBGAs/s1600/poor-performance.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="576" data-original-width="990" height="372" src="https://4.bp.blogspot.com/-XynqxSp_eYM/Wij2EghYbPI/AAAAAAAAAHU/vPozJHsLkhExZX3TvN_7YVA5VkBduQKcwCLcBGAs/s640/poor-performance.png" width="640" /></a></div>
<br />
這篇是東港計畫的後續。<br />
<br />
我發現使用這家 ArubaCloud 的&nbsp;<a href="https://www.arubacloud.com/vps/virtual-private-server-range.aspx" target="_blank">Cloud VPS – VPS Hosting</a> 挖礦不是當初設想的那麼美好。一連好幾天的反覆試驗，同樣的症狀一直重複發作。作業系統設定好，挖礦程式下載安裝然後啟動開挖後，剛開始算力都是很正常穩定的在 25 H/s 以上，但是幾個小時後再 SSH 進去看，就會發現如上圖所示，算力降到只剩 1 H/s，根本就是毫無算力。<br />
<br />
一度我懷疑是因為虛擬技術不同的關係，是不是 ArubaCloud&nbsp;這家的 VPS 採用比較不好的虛擬技術，租戶跟租戶之間的資源其實不是絕對獨立的，造成互相搶資源了。所以我做了一系列的試驗來驗證這個狀況。首先我試了重開機，發現算力沒恢復，接著我試了關機一陣子再開，試了幾次都發現算力也沒恢復，這時候其實已經排除了是租戶間的互搶狀況。<br />
<br />
於是我猜測大概是被 ArubaCloud 監控到了長時間嚴重的資源運用，啟動了什麼冷卻機制。既然重開機沒用，我就試著重設整個作業系統，也就是刪掉 VM 重做一個，這樣，算力竟然就恢復了。不過，也只能持續幾個小時，最多 12 個小時，就又降到谷底了。真是不幸。我必須一直重設。不過，想來也是，若每個租戶都像我這樣，CPU&nbsp;一直 100% 這樣操主機，VPS 廠商當然要想辦法防治這樣的狀況。<br />
<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="https://4.bp.blogspot.com/-Ij3O2bDln34/Wij-U6XxxFI/AAAAAAAAAHk/rT2Deh-QLn0TKaYxraYA0F58FGv-WgjsACLcBGAs/s1600/cx20.png" imageanchor="1" style="clear: right; float: right; margin-bottom: 1em; margin-left: 1em;"><img border="0" data-original-height="729" data-original-width="295" height="400" src="https://4.bp.blogspot.com/-Ij3O2bDln34/Wij-U6XxxFI/AAAAAAAAAHk/rT2Deh-QLn0TKaYxraYA0F58FGv-WgjsACLcBGAs/s400/cx20.png" width="161" /></a></div>
這個計畫的後續，我有三個方向：<br />
<ol>
<li>依原定計畫，持續操作完整十天，算出報酬率。</li>
<li>改用其他同樣便宜但可能不會限制 CPU 使用的 VPS 廠商，例如這家 Hetzner 的 <a href="https://www.hetzner.com/virtual-server" target="_blank">CX20</a> 方案，兩核心只要每月 6.9 歐元。</li>
<li>改租實體主機，也就是 Dedicated Server，愛怎麼操也沒人限制你，像這家&nbsp;Hetzner&nbsp;的 <a href="https://www.hetzner.com/dedicated-rootserver/matrix-ex" target="_blank">EX41</a>，真的是超級便宜的，租一台獨立的&nbsp;i7-6700 Quad-Core，只要每月 39 歐元，算來可以達到 300 H/s，值得一試。</li>
</ol>


<p>這篇是我在 hashray.com 發表的名為「<a href='https://www.hashray.com/search/label/%E6%9D%B1%E6%B8%AF%E8%A8%88%E7%95%AB'  target="_blank">東港計畫</a>」的系列文之二。</p>
<a href='https://www.hashray.com/2017/12/vps-mining.html'  target="_blank">用虛擬主機 (VPS) 挖礦的後續發展</a>
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