旁路挂载服务器硬盘 导出数据 raid和lvm操作

dell 420服务器突然不能上电，机房无备用设备；机房代维拆硬盘（硬盘C）后闪送至公司。（怀疑是电源故障）

非重实时服务，服务器单硬盘raid0

硬盘安装

方案1：相同硬件服务器，旁路挂载硬盘C。本文方法

要点：

a.raid卡需要导入硬盘C的raid信息

在界面找到import相关的选项导入即可

b.raid启动顺序为恢复用服务器原系统

方案2：其他服务器最好作为non-raid盘接入系统

提示：raid里注意看硬盘品牌和型号容量

硬件接入后就是软问题了

fdisk -l
  Disk /dev/sdb: 299.4 GB, 299439751168 bytes, 584843264 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000f3377

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *        2048     1026047      512000   83  Linux
/dev/sdb2         1026048    33927167    16450560   82  Linux swap / Solaris
/dev/sdb3        33927168   138784767    52428800   83  Linux
/dev/sdb4       138784768   584843263   223029248    5  Extended
/dev/sdb5       138786816   584843263   223028224   83  Linux

Disk /dev/sdc: 299.4 GB, 299439751168 bytes, 584843264 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x00042065

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1   *        2048     2099199     1048576   83  Linux
/dev/sdc2         2099200   584843263   291372032   8e  Linux LVM

Disk /dev/sda: 146.8 GB, 146815733760 bytes, 286749480 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x0008e102

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1              63   286744184   143372061   83  Linux

查看是否已经识别到了硬盘

sdc为需要导出数据的硬盘

系统未安装lvm工具先安装

yum install lvm2 -y

寻找需要vg

vgscan  
  Reading volume groups from cache.
  Found volume group "centos" using metadata type lvm2

激活vg

vgchange -ay

现在 系统下就有对应的挂载设备了

ll /dev/centos/
total 0
lrwxrwxrwx 1 root root 7 Feb 16 20:53 home -> ../dm-1
lrwxrwxrwx 1 root root 7 Feb 16 20:53 root -> ../dm-2
lrwxrwxrwx 1 root root 7 Feb 16 20:53 swap -> ../dm-0

挂载

mkdir /mnt/root
mkdir /mnt/home
mount /dev/centos/root /mnt/root
mount /dev/centos/home /mnt/home

ok 倒数据