# 為私有雲建立raid磁碟 **要作為正式用途，例如家裡老舊電腦用來作家中儲存雲，我們需要利用先前介紹的資料映射方法，將上傳的資料存於外部目錄，與容器本身分離，避免勿刪容器導致所有資料不見**
**讓nextcloud的docker容器成為執行環境，所有資料則儲存於外部raid模式的硬碟，這樣，就可以建構簡易的家庭或學校的儲存雲** **製作raid1的磁碟** **當我們將ubuntu系統與docker安裝於一個系統跌後，我們可以使用兩顆空硬碟，並把他們做成raid1格式，然後作為nexttcloud資料存放之處，可有效保護資料安全** **我們可以先關閉VM，然後在上面建立兩顆空磁碟做為模擬使用** ![](https://lh5.googleusercontent.com/UJoifTMSpPLWJWaLwwGGMfJwNHWQ4Bmq2wD0zbEtZ3OBg-klqgYeQfqtLG2zn1-O3HKx7qMQ8JthBU1bUGUOUr9jFhtyIrIu4Wiy42L-DaER_qFjimRuwwfQ-Sf265geJhRv4ITl) **重新啟動ubuntu** **sudo fdisk -l** **Disk /dev/sdb: 10 GiB, 10737418240 bytes, 20971520 sectors**\ \ **Disk /dev/sdc: 10 GiB, 10737418240 bytes, 20971520 sectors**
**兩顆空磁碟，分別為sdb sdc**
**製作raid1** **sudo fdisk /dev/sdb**\ \ **disk table複製** ``` sudo sfdisk -d /dev/sdb | sudo sfdisk /dev/sdc ``` **# metadata 鏡像，資料也鏡像**\ **sudo mkfs.btrfs -m raid1 -d raid1 /dev/sdb1 /dev/sdc1 -L bt0** **sudo btrfs fi show**\ **Label: 'bt0' uuid: 994bc666-5d3a-45f9-99e4-ef9e64931966**\ **Total devices 2 FS bytes used 186.21MiB**\ **devid 1 size 10.00GiB used 2.01GiB path /dev/sdb1**\ **devid 2 size 10.00GiB used 2.01GiB path /dev/sdc1**\
**測試btrfs raid1鏡像功能** **掛載其中一個 device 就可以了：** **sudo mkdir /mnt/raid**\ **sudo mount /dev/sdb1 /mnt/raid** **cd /mnt/raid** **產生多個檔案 test1 test2 ......** **sudo touch test{1..100}**
**測試作為raid1的另一顆磁碟sdc1是否有相同的檔案** **sudo mkdir /mnt/temp** **sudo mount /dev/sdc1 /mnt/temp** **cd /mnt/temp** **ls後你可以看到相同的檔案產生**
**設定開機自動掛載** **sudo vi /etc/fstab** **加入這行設定** **UUID=994bc666-5d3a-45f9-99e4-ef9e64931966 /mnt/raid btrfs defaults 0 2**\
**擴充：後來多一顆硬碟**
**sudo fdisk -l** ![](/files/-LkcLSFebriC9-XjyCpV) ``` sudo sfdisk -d /dev/sdb | sud0 sfdisk /dev/sdd sudo btrfs device add /dev/sdd1 /mnt/raid1 sudo btrfs fi show Label: 'bt0' uuid: 2cf15b5b-63b2-420a-afa8-e5ec4af595e4 Total devices 3 FS bytes used 640.00KiB devid 1 size 10.00GiB used 2.01GiB path /dev/sdb1 devid 2 size 10.00GiB used 2.01GiB path /dev/sdc1 devid 3 size 10.00GiB used 0.00B path /dev/sdd1 sudo btrfs balance start --full-balance /mnt/raid1 Done, had to relocate 3 out of 3 chunks ``` \ **失效回充：忽然硬碟壞掉** **假設今天sdb壞了硬碟都讀不到，假設原sdc1硬碟損毀**\ \ **btrfs fi show 中顯示 \*\*\* Some devices missing**\ \ **mount -t btrfs -o degraded /dev/sdb1 /root/temp #把sdb1掛在/mnt下**\ \ **btrfs device add /dev/sdc1 /root/temp #將新的sdc1加入**\ \ **btrfs device delete missing /root/temp #移除消失的device**\ **或**\ **btrfs device delete 1 /root/temp #1是missing的deviceid**\ \ \ **sudo btrfs balance start /root/temp #平衡硬碟間的資料**\
**修復完成，重新開機**
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