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03 January / Eric Chang / 筆記

# [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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2020/01/02 , 2020年上工的第一天，群暉的 DS415+ NAS 掛了！

因為群暉的文件在最關鍵的一步寫得亂七八糟！

所以在這邊紀錄一下我操作的步驟！

#### 建立可開機的ubuntu 隨身碟

建立 bootable ubuntu flash 的步驟，請參考底下網頁介紹，這邊就不多說了

https://tutorials.ubuntu.com/tutorial/tutorial-create-a-usb-stick-on-ubuntu#0

#### 把NAS上的硬碟接上PC

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…

#### 用隨身碟開機進入ubuntu Live 環境

懶人沒截圖

#### 安裝必要套件

進入 ubuntu Live 之後，按 ctal + alt + t

開啟 terminal ，然後先安裝 mdadm & lvm2

    ubuntu@ubuntu:~$ sudo apt install mdadm lvm2
    Reading package lists... Done
    Building dependency tree
    Reading state information... Done
    Suggested packages:
      thin-provisioning-tools default-mta | mail-transport-agent dracut-core
    The following NEW packages will be installed:
      mdadm
    The following packages will be upgraded:
      lvm2
    1 upgraded, 1 newly installed, 0 to remove and 780 not upgraded.
    Need to get 1,346 kB of archives.
    After this operation, 1,237 kB of additional disk space will be used.
    Get:1 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 lvm2 amd64 2.02.176-4.1ubuntu3.18.04.2 [930 kB]
    Get:2 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 mdadm amd64 4.1~rc1-3~ubuntu18.04.2 [416 kB]
    Fetched 1,346 kB in 3s (501 kB/s)
    ....
    ...
    ...
    以下省略

#### scan raid and lvm

接下來先換成 root 操作

    ubuntu@ubuntu:~$ sudo su -

然後掃描 raid & LVM

    root@ubuntu:~# mdadm -Asf && vgchange -ay
    mdadm: /dev/md/2 has been started with 4 drives.
      2 logical volume(s) in volume group "vg1" now active

COOL！ 原本的VG出現了！

    root@ubuntu:~# vgdisplay
      --- Volume group ---
      VG Name               vg1
      System ID
      Format                lvm2
      Metadata Areas        1
      Metadata Sequence No  3
      VG Access             read/write
      VG Status             resizable
      MAX LV                0
      Cur LV                2
      Open LV               0
      Max PV                0
      Cur PV                1
      Act PV                1
      VG Size               5.44 TiB
      PE Size               4.00 MiB
      Total PE              1427264
      Alloc PE / Size       1427264 / 5.44 TiB
      Free  PE / Size       0 / 0
      VG UUID               O1c8Uw-JmKy-EiKt-92OB-3K3y-roMi-9NUZ6H

也可以看到 RAID 資訊了！

    root@ubuntu:~# mdadm -D /dev/md2
    /dev/md2:
               Version : 1.2
         Creation Time : Thu Oct 13 07:26:12 2016
            Raid Level : raid5
            Array Size : 5846077632 (5575.25 GiB 5986.38 GB)
         Used Dev Size : 1948692544 (1858.42 GiB 1995.46 GB)
          Raid Devices : 4
         Total Devices : 4
           Persistence : Superblock is persistent

           Update Time : Thu Jan  2 01:48:34 2020
                 State : clean
        Active Devices : 4
       Working Devices : 4
        Failed Devices : 0
         Spare Devices : 0

                Layout : left-symmetric
            Chunk Size : 64K

    Consistency Policy : resync

                  Name : video:2
                  UUID : 18f6706d:91eaaec9:5b0ba8da:e32481e3
                Events : 96

        Number   Major   Minor   RaidDevice State
           0       8       51        0      active sync   /dev/sdd3
           1       8       35        1      active sync   /dev/sdc3
           2       8       19        2      active sync   /dev/sdb3
           3       8        3        3      active sync   /dev/sda3

然後就會發生我之前寫的這篇的狀況

https://h.cowbay.org/post/what-a-piss-in-synology-document/

問題發生了，總是要想辦法解決

#### scan lv

    root@ubuntu:~# lvscan
      ACTIVE            '/dev/vg1/syno_vg_reserved_area' [12.00 MiB] inherit
      ACTIVE            '/dev/vg1/volume_1' [5.44 TiB] inherit

OK ，在 vg1 底下有兩個 volume ，看大小來判斷，第二個是我們要的

用底下的指令就可以掛載了

    mount /dev/vg1/volume_1 /mnt

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

    root@ubuntu:/dev# mount /dev/vg1/volume_1 /mnt
    root@ubuntu:/dev# cd /mnt
    root@ubuntu:/mnt# ls
    @appstore     @database  @EP_trash   @MailScanner  @S2S
    aquota.group  @download  @iSCSITrg   music         synoquota.db
    aquota.user   @eaDir     lost+found  nfsforprox    @tmp
    @clamav       @EP        @maillog    photo         video

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！

Categories 筆記

Tags synology nas

Written by:Eric Chang

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