飞牛NAS读取群晖的硬盘

## 【失败】1、mapper映射挂载群晖硬盘
1. 插入黑群晖的硬盘后，启动飞牛OS；
2. ssh连接到飞牛，如果远程的话，建议用zerotier虚拟局域网；
3. 切换root用户
`sudo -i`，看到了`root@LvNAS:~# ` 表示成功了。

4. 查看硬盘映射情况
命令`ll /dev/mapper/`，
看到vg1_volumn_1形式的文件名，就说明你离成功不远了，这个就是存放群晖文件的文件夹。如下，我的挂载2块群晖盘：
![](/media/202508/2025-08-20_111118&dxgKl3G4rjBHwOoZWv6D.png)

5. 在飞牛os中新建文件夹。在文件夹上右键点击“详细信息”，然后“复制原始路径”。
![](/media/202508/2025-08-20_111612&9kr68RsgQwPSDKJhLvj5.png)

6. mount命令进行映射
```
mkdir /vol3
mount /dev/mapper/vg3-volume_3 /vol3
```
但是出现如下报错：
```
mount: /vol3: can't read superblock on /dev/mapper/vg3-volume_3.
       dmesg(1) may have more information after failed mount system call.
```

### 【成功啦】查看硬盘挂载情况，然后直接复制（要求是btrfs格式）
一、用`lsdlk`查看硬盘挂载情况【没该命令】
二、用`lvdisplay`查看：
```
root@LvNAS:~# lvdisplay 
  --- Logical volume ---
  LV Path                /dev/trim_a03aaf3b_feec_459a_bceb_23e68aa97c6e/0
  LV Name                0
  VG Name                trim_a03aaf3b_feec_459a_bceb_23e68aa97c6e
  LV UUID                0gtIvc-1Nfn-8r63-ZeNc-fsVB-XF5O-kefFl1
  LV Write Access        read/write
  LV Creation host, time LvNAS, 2025-08-19 20:27:39 +0800
  LV Status              available
  # open                 1
  LV Size                <889.74 GiB
  Current LE             227773
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0
   
  WARNING: PV /dev/md126 in VG vg4 is using an old PV header, modify the VG to update.
  --- Logical volume ---
  LV Path                /dev/vg4/syno_vg_reserved_area
  LV Name                syno_vg_reserved_area
  VG Name                vg4
  LV UUID                c2y4Pj-dG6z-lkGX-5lcX-UkLE-Mdjq-RGB0On
  LV Write Access        read/write
  LV Creation host, time , 
  LV Status              available
  # open                 0
  LV Size                12.00 MiB
  Current LE             3
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1
   
  --- Logical volume ---
  LV Path                /dev/vg4/volume_4
  LV Name                volume_4
  VG Name                vg4
  LV UUID                pd4gRC-TlsG-hW0J-BSmt-4VPe-eqma-jbLwKS
  LV Write Access        read/write
  LV Creation host, time , 
  LV Status              available
  # open                 0
  LV Size                884.00 GiB
  Current LE             226304
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2
   
  --- Logical volume ---
  LV Path                /dev/trim_5b7a53f1_0b06_4b63_b7f0_cd2d3af508a3/0
  LV Name                0
  VG Name                trim_5b7a53f1_0b06_4b63_b7f0_cd2d3af508a3
  LV UUID                8LBTkn-vPKx-oK9Q-rHBw-NVqM-XOj2-viUjGA
  LV Write Access        read/write
  LV Creation host, time LvNAS, 2025-08-19 20:28:45 +0800
  LV Status              available
  # open                 1
  LV Size                <2.73 TiB
  Current LE             715364
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:3
   
  WARNING: PV /dev/md124 in VG vg3 is using an old PV header, modify the VG to update.
  --- Logical volume ---
  LV Path                /dev/vg3/syno_vg_reserved_area
  LV Name                syno_vg_reserved_area
  VG Name                vg3
  LV UUID                CO3MMM-AE3o-G5qi-upZG-Gjcc-saP8-w8swFq
  LV Write Access        read/write
  LV Creation host, time , 
  LV Status              available
  # open                 0
  LV Size                12.00 MiB
  Current LE             3
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:4
   
  --- Logical volume ---
  LV Path                /dev/vg3/volume_3
  LV Name                volume_3
  VG Name                vg3
  LV UUID                Ajo3Or-ikKD-9Uq8-fvwo-0nyX-iSzt-a4GTZD
  LV Write Access        read/write
  LV Creation host, time , 
  LV Status              available
  # open                 0
  LV Size                <2.72 TiB
  Current LE             712704
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:5
```
上面可以看到我有两个`/dev/vg3/volume_3`和`/dev/vg4/volume_4`都是来自群晖的，另外2个`/dev/trim`开头的都是我飞牛NAS上创建的。

#### 使用btrfs开始复制
创建飞牛NAS中的盘，并获取原始路径：
![](/media/202508/2025-08-20_112756&HWFEhBQ0JnkXK9U87vfr.png)

看到是：`/vol1/1000/fromQH`
```
#将volume_3的内容换到新的目录fromQH
btrfs restore /dev/vg3/volume_3 /vol1/1000/fromQH
```
```
#将volume_4的内容换到新的目录music
btrfs restore /dev/vg4/volume_4 /vol1/1000/music
```

**大功告成**
![](/media/202508/2025-08-20_113153&761TpReb5AEK9IrxW38B.png)