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<span class="date">12 December</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'> [碎念] mdadm 超級慢的rebuild 速度 Incredibly Slow mdadm Rebuild</h1>
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<p>最近在做一台老機器的P2V</p>
<p>偏偏user說不能關機所以我用dd + ssh 做線上移轉</p>
<p>這部份有空再來寫</p>
<p>只是因為原來的設定有用mdadm 做raid1</p>
<p>這部份導致移轉過去proxmox 後會出現raid degrade 導致無法正常開機</p>
<p>我的想法是既然開機會出現raid degrade</p>
<p>那我就加第二顆硬碟給它,讓它做 rebuild</p>
<p>OK原則上這樣做沒有問題</p>
<p>問題是它X的這個mdadm rebuild 的速度也未免太慢了吧!</p>
<pre><code>Every 2.0s: cat /proc/mdstat Wed Dec 12 11:01:36 2018
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md1 : active raid1 sda1[0] sdb1[2]
975296 blocks super 1.2 [2/2] [UU]
md0 : active raid1 sda5[0] sdb5[2]
487276352 blocks super 1.2 [2/1] [U_]
[&gt;....................] recovery = 0.5% (2468032/487276352) finish=2079.7min speed=3884K/sec
unused devices: &lt;none&gt;
</code></pre>
<p>這個是一開始跑的速度</p>
<p>然後這個是跑了大概10分鐘之後的速度(有稍稍提昇一點點)</p>
<pre><code>Every 2.0s: cat /proc/mdstat Wed Dec 12 11:17:31 2018
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md1 : active raid1 sda1[0] sdb1[2]
975296 blocks super 1.2 [2/2] [UU]
md0 : active raid1 sda5[0] sdb5[2]
487276352 blocks super 1.2 [2/1] [U_]
[&gt;....................] recovery = 1.4% (6978688/487276352) finish=1915.9min speed=4177K/sec
unused devices: &lt;none&gt;
</code></pre>
<p>等等看會不會速度再快一點..</p>
<p>一個小時了,還是一樣慢..</p>
<pre><code>Every 2.0s: cat /proc/mdstat Wed Dec 12 12:20:16 2018
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md1 : active raid1 sda1[0] sdb1[2]
975296 blocks super 1.2 [2/2] [UU]
md0 : active raid1 sda5[0] sdb5[2]
487276352 blocks super 1.2 [2/1] [U_]
[=&gt;...................] recovery = 5.2% (25526016/487276352) finish=858.6min speed=8962K/sec
unused devices: &lt;none&gt;
</code></pre>
<p>突然又加速了,希望能維持下去啊!&hellip;.</p>
<pre><code>Every 2.0s: cat /proc/mdstat Wed Dec 12 13:33:42 2018
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md1 : active raid1 sda1[0] sdb1[2]
975296 blocks super 1.2 [2/2] [UU]
md0 : active raid1 sda5[0] sdb5[2]
487276352 blocks super 1.2 [2/1] [U_]
[========&gt;............] recovery = 43.6% (212611904/487276352) finish=47.6min speed=96104K/sec
unused devices: &lt;none&gt;
</code></pre>
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