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---
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title: "[碎念] mdadm 超級慢的rebuild 速度 Incredibly Slow mdadm Rebuild"
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date: 2018-12-12T11:10:22+08:00
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noSummary: false
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image: "https://h.cowbay.org/images/post-default-1.jpg"
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categories: ['碎念']
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tags: ['mdadm']
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author: "Eric Chang"
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---
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最近在做一台老機器的P2V
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偏偏user說不能關機，所以我用dd + ssh 做線上移轉
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這部份有空再來寫
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只是因為原來的設定有用mdadm 做raid1
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這部份導致移轉過去proxmox 後，會出現raid degrade 導致無法正常開機
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<!--more-->
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我的想法是既然開機會出現raid degrade
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那我就加第二顆硬碟給它，讓它做 rebuild
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OK，原則上這樣做沒有問題
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問題是它X的，這個mdadm rebuild 的速度也未免太慢了吧！
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```
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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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```
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這個是一開始跑的速度
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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)
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```
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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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```
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等等看會不會速度再快一點..
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一個小時了，還是一樣慢..
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```
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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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```
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突然又加速了，希望能維持下去啊！....
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```
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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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```
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