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---
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title: "[筆記] 解決無法建立zpool 的錯誤 / Fix Zpool Device Busy Using dmsetup"
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date: 2019-04-01T15:56:27+08:00
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draft: false
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noSummary: false
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image: "https://h.cowbay.org/images/post-default-11.jpg"
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categories: ['筆記']
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tags: ['zfs']
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author: "Eric Chang"
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---
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今天把其中一台proxmox 加上10G 光纖網卡，準備和另一台proxmox 組成10G 環境進行測試
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想說把本機的zpool 拆掉，重新建立一個raid0 的空間來做clone/migrate
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可是一直出現device busy的錯誤訊息
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<!--more-->
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```
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root@pve:~# zpool create zp sdb1
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cannot open '/dev/sdb1': Device or resource busy
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```
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可是我沒有mount 這個分割進來
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而且我也可以用fdisk 去切sdb ，代表sdb 沒有真的被使用
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找了很久，終於找到這個dmsetup指令
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先用 ```dmsetup info -C ``` 來看現在的狀態
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```
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root@pve:~# dmsetup info -C
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Name Maj Min Stat Open Targ Event UUID
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ST2000DM001-1ER164_W4Z3KKJB 253 3 L--w 0 1 0 mpath-ST2000DM001-1ER164_W4Z3KKJB
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pve-swap 253 0 L--w 2 1 0 LVM-6Hle5UGjtr8NQQsbMrYlSdGXZklwAi87Kq9NlzQa6xvgiHOEP3Ekx72i5yYNaupf
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pve-root 253 1 L--w 1 1 0 LVM-6Hle5UGjtr8NQQsbMrYlSdGXZklwAi87geZeFZsQsgYUbI1ZJU4lKD86TVd1MNrq
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ST2000DM001-1ER164_W4Z3KM2F-part1 253 5 L--w 0 1 0 part1-mpath-ST2000DM001-1ER164_W4Z3KM2F
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ST2000DM001-1ER164_W4Z3KM2F 253 2 L--w 1 1 0 mpath-ST2000DM001-1ER164_W4Z3KM2F
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ST2000DM001-1ER164_W4Z3GYNJ 253 4 L--w 0 1 0 mpath-ST2000DM001-1ER164_W4Z3GYNJ
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```
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除了那兩個LVM開頭的以外，其他都不應該出現在這裡才對
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移除掉應該就可以了
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要照順序，像那個有part1 的，就要先移掉，才能移掉底層
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```
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root@pve:~# dmsetup remove ST2000DM001-1ER164_W4Z3KM2F-part1
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root@pve:~# dmsetup remove ST2000DM001-1ER164_W4Z3KM2F
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root@pve:~# dmsetup remove ST2000DM001-1ER164_W4Z3KKJB
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root@pve:~# dmsetup remove ST2000DM001-1ER164_W4Z3KM2F
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root@pve:~# dmsetup remove ST2000DM001-1ER164_W4Z3GYNJ
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```
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再來建立zpool 就 OK了
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```
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root@pve:~# zpool create zp sdb sdc sdd
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root@pve:~# zpool status
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pool: zp
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state: ONLINE
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scan: none requested
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config:
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NAME STATE READ WRITE CKSUM
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zp ONLINE 0 0 0
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sdb ONLINE 0 0 0
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sdc ONLINE 0 0 0
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sdd ONLINE 0 0 0
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errors: No known data errors
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root@pve:~#
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```
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