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<h3><a href="/post/incredibly-slow-mdadm-rebuild/">[碎念] mdadm 超級慢的rebuild 速度 Incredibly Slow mdadm Rebuild</a></h3>
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<div class="meta">
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<span class="date moment">2018-12-12</span>
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<a href="/categories/%E7%A2%8E%E5%BF%B5">碎念</a>
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<span class="author"><a href="/author/eric-chang">Eric Chang</a></span>
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<p>最近在做一台老機器的P2V</p>
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<p>偏偏user說不能關機，所以我用dd + ssh 做線上移轉</p>
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<p>這部份有空再來寫</p>
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<p>只是因為原來的設定有用mdadm 做raid1</p>
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<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>
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<p></p>
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<p>我的想法是既然開機會出現raid degrade</p>
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<p>那我就加第二顆硬碟給它，讓它做 rebuild</p>
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<p>OK，原則上這樣做沒有問題</p>
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<p>問題是它X的，這個mdadm rebuild 的速度也未免太慢了吧！</p>
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<pre><code>Every 2.0s: cat /proc/mdstat Wed Dec 12 11:01:36 2018
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Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
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md1 : active raid1 sda1[0] sdb1[2]
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975296 blocks super 1.2 [2/2] [UU]
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md0 : active raid1 sda5[0] sdb5[2]
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487276352 blocks super 1.2 [2/1] [U_]
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[>....................] recovery = 0.5% (2468032/487276352) finish=2079.7min speed=3884K/sec
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unused devices: <none>
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</code></pre>
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<p>這個是一開始跑的速度</p>
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<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>
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<pre><code>Every 2.0s: cat /proc/mdstat Wed Dec 12 11:17:31 2018
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Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
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md1 : active raid1 sda1[0] sdb1[2]
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975296 blocks super 1.2 [2/2] [UU]
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md0 : active raid1 sda5[0] sdb5[2]
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487276352 blocks super 1.2 [2/1] [U_]
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[>....................] recovery = 1.4% (6978688/487276352) finish=1915.9min speed=4177K/sec
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unused devices: <none>
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</code></pre>
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<p>等等看會不會速度再快一點..</p>
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<p>一個小時了，還是一樣慢..</p>
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<pre><code>Every 2.0s: cat /proc/mdstat Wed Dec 12 12:20:16 2018
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Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
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md1 : active raid1 sda1[0] sdb1[2]
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975296 blocks super 1.2 [2/2] [UU]
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md0 : active raid1 sda5[0] sdb5[2]
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487276352 blocks super 1.2 [2/1] [U_]
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[=>...................] recovery = 5.2% (25526016/487276352) finish=858.6min speed=8962K/sec
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unused devices: <none>
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</code></pre>
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<p>突然又加速了，希望能維持下去啊！….</p>
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<pre><code>Every 2.0s: cat /proc/mdstat Wed Dec 12 13:33:42 2018
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Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
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md1 : active raid1 sda1[0] sdb1[2]
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975296 blocks super 1.2 [2/2] [UU]
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md0 : active raid1 sda5[0] sdb5[2]
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487276352 blocks super 1.2 [2/1] [U_]
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[========>............] recovery = 43.6% (212611904/487276352) finish=47.6min speed=96104K/sec
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unused devices: <none>
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</code></pre>
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