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---
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title: "[筆記] 用ubuntu livecd 救援群暉 synology NAS內的資料 / rescue synology nas with ubuntu livecd"
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date: 2020-01-03T15:43:45+08:00
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draft: false
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noSummary: false
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categories: ['筆記']
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image: https://h.cowbay.org/images/post-default-11.jpg
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tags: ['synology','nas']
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author: "Eric Chang"
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keywords:
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- synology
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- nas
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---
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2020/01/02 , 2020年上工的第一天，群暉的 DS415+ NAS 掛了！
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因為群暉的文件在最關鍵的一步寫得亂七八糟！
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所以在這邊紀錄一下我操作的步驟！
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<!--more-->
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#### 建立可開機的ubuntu 隨身碟
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建立 bootable ubuntu flash 的步驟，請參考底下網頁介紹，這邊就不多說了
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https://tutorials.ubuntu.com/tutorial/tutorial-create-a-usb-stick-on-ubuntu#0
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#### 把NAS上的硬碟接上PC
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還好這次的NAS只有四顆，如果有八顆，我去哪裡生可以接八顆硬碟的主機...
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#### 用隨身碟開機進入ubuntu Live 環境
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懶人沒截圖
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#### 安裝必要套件
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進入 ubuntu Live 之後，按 ctal + alt + t
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開啟 terminal ，然後先安裝 mdadm & lvm2
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```
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ubuntu@ubuntu:~$ sudo apt install mdadm lvm2
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Reading package lists... Done
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Building dependency tree
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Reading state information... Done
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Suggested packages:
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thin-provisioning-tools default-mta | mail-transport-agent dracut-core
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The following NEW packages will be installed:
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mdadm
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The following packages will be upgraded:
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lvm2
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1 upgraded, 1 newly installed, 0 to remove and 780 not upgraded.
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Need to get 1,346 kB of archives.
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After this operation, 1,237 kB of additional disk space will be used.
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Get:1 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 lvm2 amd64 2.02.176-4.1ubuntu3.18.04.2 [930 kB]
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Get:2 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 mdadm amd64 4.1~rc1-3~ubuntu18.04.2 [416 kB]
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Fetched 1,346 kB in 3s (501 kB/s)
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....
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...
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...
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以下省略
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```
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#### scan raid and lvm
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接下來先換成 root 操作
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```
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ubuntu@ubuntu:~$ sudo su -
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```
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然後掃描 raid & LVM
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```
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root@ubuntu:~# mdadm -Asf && vgchange -ay
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mdadm: /dev/md/2 has been started with 4 drives.
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2 logical volume(s) in volume group "vg1" now active
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```
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COOL！ 原本的VG出現了！
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```
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root@ubuntu:~# vgdisplay
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--- Volume group ---
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VG Name vg1
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System ID
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Format lvm2
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Metadata Areas 1
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Metadata Sequence No 3
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VG Access read/write
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VG Status resizable
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MAX LV 0
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Cur LV 2
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Open LV 0
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Max PV 0
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Cur PV 1
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Act PV 1
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VG Size 5.44 TiB
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PE Size 4.00 MiB
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Total PE 1427264
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Alloc PE / Size 1427264 / 5.44 TiB
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Free PE / Size 0 / 0
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VG UUID O1c8Uw-JmKy-EiKt-92OB-3K3y-roMi-9NUZ6H
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```
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也可以看到 RAID 資訊了！
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```
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root@ubuntu:~# mdadm -D /dev/md2
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/dev/md2:
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Version : 1.2
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Creation Time : Thu Oct 13 07:26:12 2016
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Raid Level : raid5
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Array Size : 5846077632 (5575.25 GiB 5986.38 GB)
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Used Dev Size : 1948692544 (1858.42 GiB 1995.46 GB)
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Raid Devices : 4
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Total Devices : 4
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Persistence : Superblock is persistent
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Update Time : Thu Jan 2 01:48:34 2020
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State : clean
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Active Devices : 4
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Working Devices : 4
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Failed Devices : 0
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Spare Devices : 0
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Layout : left-symmetric
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Chunk Size : 64K
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Consistency Policy : resync
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Name : video:2
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UUID : 18f6706d:91eaaec9:5b0ba8da:e32481e3
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Events : 96
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Number Major Minor RaidDevice State
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0 8 51 0 active sync /dev/sdd3
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1 8 35 1 active sync /dev/sdc3
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2 8 19 2 active sync /dev/sdb3
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3 8 3 3 active sync /dev/sda3
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```
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然後就會發生我之前寫的這篇的狀況
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https://h.cowbay.org/post/what-a-piss-in-synology-document/
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問題發生了，總是要想辦法解決
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#### scan lv
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```
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root@ubuntu:~# lvscan
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ACTIVE '/dev/vg1/syno_vg_reserved_area' [12.00 MiB] inherit
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ACTIVE '/dev/vg1/volume_1' [5.44 TiB] inherit
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```
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OK ，在 vg1 底下有兩個 volume ，看大小來判斷，第二個是我們要的
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用底下的指令就可以掛載了
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```
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mount /dev/vg1/volume_1 /mnt
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```
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請依照自己的環境，把第一個路徑改掉，如果要掛載到別的目錄，那也把第二個 /mnt 改掉
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```
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root@ubuntu:/dev# mount /dev/vg1/volume_1 /mnt
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root@ubuntu:/dev# cd /mnt
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root@ubuntu:/mnt# ls
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@appstore @database @EP_trash @MailScanner @S2S
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aquota.group @download @iSCSITrg music synoquota.db
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aquota.user @eaDir lost+found nfsforprox @tmp
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@clamav @EP @maillog photo video
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```
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OK，可以看到原本NAS 下的目錄了，接下來就可以進行檔案複製了！
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