迁移硬盘至其它主机
1、当前旧主机情况
假设旧主机名称 vmcnszs212 ，磁盘部署如下：
root@vmcnszs212:/home/szscm# ls /dev/sd*
/dev/sda /dev/sda1 /dev/sda2 /dev/sda3 /dev/sda4 /dev/sdb /dev/sdb1
root@vmcnszs212:/home/szscm# ls /dev/vg1/lv1
/dev/vg1/lv1
root@vmcnszs212:/home/szscm# pvs
PV VG Fmt Attr PSize PFree
/dev/sdb1 vg1 lvm2 a-- <128.00g 0
root@vmcnszs212:/home/szscm# vgs
VG #PV #LV #SN Attr VSize VFree
vg1 1 1 0 wz--n- <128.00g 0
root@vmcnszs212:/home/szscm# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lv1 vg1 -wi-ao---- <128.00g
root@vmcnszs212:/home2# mount |grep sda
/dev/sda4 on / type ext4 (rw,relatime)
/dev/sda2 on /boot type ext4 (rw,relatime)
root@vmcnszs212:/home/szscm# cd /
root@vmcnszs212:/# df -h .
Filesystem Size Used Avail Use% Mounted on
/dev/sda4 108G 31G 73G 30% /
root@vmcnszs212:/# cd /home2/
root@vmcnszs212:/home2# df -h .
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg1-lv1 126G 61M 120G 1% /home2
也就是说，
- 主机
vmcnszs212有两块硬盘： 对应/dev/sda,/dev/sdb - 第一块硬盘分了四个区：对应
/dev/sda1,/dev/sda2,/dev/sda3,/dev/sda4 - 第二块硬盘分了一个区：对应
/dev/sdb1 - 第一块硬盘用作系统分区： 分区
/dev/sda1,3未用，/dev/sda2挂载/boot路径，/dev/sda3挂载/根路径。 - 第二块硬盘用LVM管理，对应的vg1组与lv1，并挂载对应的
/dev/mapper/vg1-lv1在/home2路径中。
2、新主机的期望情况
假设我们想将用户数据硬盘迁移至新主机（假设是vmcnszs218)，通过前面信息，我们可知实际的用户数据在 /home2 中，而 /home2 存在于 /dev/sdb 的LVM卷中。所以需要将 /dev/sdb 硬盘安装在 vmcnszs218 主机中。
迁移后，我们假设新主机本身系统中有一个同样的 /home2 目录，其中就是之前旧 vmcnszs212 主机 /dev/sdb 中的内容。
后面讲述迁移硬盘的过程。
3、迁移数据硬盘
不能简单的安装，遵循如下步骤：
在旧主机上
-
umount所有卷组的逻辑卷
#umount /home2 -
禁用卷组
#vgchange -a n vg1 0 logical volume(s) in volume group "vg1" now active #lvdisplay --- Logical volume --- LV Path /dev/vg1/lv1 LV Name lv1 VG Name vg1 LV UUID ns20pO-ow9P-eeFR-56xW-p8L0-lVHM-xEJ7GE LV Write Access read/write LV Creation host, time vmcnszs212, 2020-07-23 01:56:15 +0000 LV Status NOT available LV Size <128.00 GiB Current LE 32767 Segments 1 Allocation inherit Read ahead sectors auto此时，我们也无法在系统路径中看到
/dev/vg1/lv1路径了。 -
导出卷组
#vgexport vg1 Volume group "vg1" successfully exported #pvscan PV /dev/sdb1 is in exported VG vg1 [<128.00 GiB / 0 free] Total: 1 [<128.00 GiB] / in use: 1 [<128.00 GiB] / in no VG: 0 [0 ] #vgdisplay --- Volume group --- VG Name vg1 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 3 VG Access read/write VG Status exported/resizable MAX LV 0 Cur LV 1 Open LV 0 Max PV 0 Cur PV 1 Act PV 1 VG Size <128.00 GiB PE Size 4.00 MiB Total PE 32767 Alloc PE / Size 32767 / <128.00 GiB Free PE / Size 0 / 0 VG UUID xDrErD-tq0K-qETy-ICnE-QaL5-qpjt-7CjTWN最后，拆下旧主机
/dev/sdb对应的硬盘，安装在目标机器上。
新主机上
-
查看磁盘信息
szscm@vmcnszs218:~$ ls /dev/sd sda sda1 sda2 sdb sdb1 root@vmcnszs218:/home/szscm# pvdisplay Physical volume "/dev/sdb1" of volume group "vg1" is exported --- Physical volume --- PV Name /dev/sdb1 VG Name vg1 (exported) PV Size <128.00 GiB / not usable 3.00 MiB Allocatable yes (but full) PE Size 4.00 MiB Total PE 32767 Free PE 0 Allocated PE 32767 PV UUID 73jNBw-GVPw-Wtob-FD3g-r3uU-gsib-Acxjo8 root@vmcnszs218:/home/szscm# vgdisplay --- Volume group --- VG Name vg1 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 5 VG Access read/write VG Status exported/resizable MAX LV 0 Cur LV 1 Open LV 0 Max PV 0 Cur PV 1 Act PV 1 VG Size <128.00 GiB PE Size 4.00 MiB Total PE 32767 Alloc PE / Size 32767 / <128.00 GiB Free PE / Size 0 / 0 VG UUID xDrErD-tq0K-qETy-ICnE-QaL5-qpjt-7CjTWN root@vmcnszs218:/home/szscm# lvdisplay其中
sdb与sdb1就是包含LVM的磁盘。 -
导入卷组
# vgimport vg1 Volume group "vg1" successfully imported root@vmcnszs218:/home/szscm# pvdisplay --- Physical volume --- PV Name /dev/sdb1 VG Name vg1 PV Size <128.00 GiB / not usable 3.00 MiB Allocatable yes (but full) PE Size 4.00 MiB Total PE 32767 Free PE 0 Allocated PE 32767 PV UUID 73jNBw-GVPw-Wtob-FD3g-r3uU-gsib-Acxjo8 root@vmcnszs218:/home/szscm# vgdisplay --- Volume group --- VG Name vg1 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 0 Max PV 0 Cur PV 1 Act PV 1 VG Size <128.00 GiB PE Size 4.00 MiB Total PE 32767 Alloc PE / Size 32767 / <128.00 GiB Free PE / Size 0 / 0 VG UUID xDrErD-tq0K-qETy-ICnE-QaL5-qpjt-7CjTWN root@vmcnszs218:/home/szscm# lvdisplay --- Logical volume --- LV Path /dev/vg1/lv1 LV Name lv1 VG Name vg1 LV UUID ns20pO-ow9P-eeFR-56xW-p8L0-lVHM-xEJ7GE LV Write Access read/write LV Creation host, time vmcnszs212, 2020-07-23 01:56:15 +0000 LV Status NOT available LV Size <128.00 GiB Current LE 32767 Segments 1 Allocation inherit Read ahead sectors auto -
启用卷组
root@vmcnszs218:/home/szscm# vgchange -ay vg1 1 logical volume(s) in volume group "vg1" now active root@vmcnszs218:/home/szscm# pvdisplay --- Physical volume --- PV Name /dev/sdb1 VG Name vg1 PV Size <128.00 GiB / not usable 3.00 MiB Allocatable yes (but full) PE Size 4.00 MiB Total PE 32767 Free PE 0 Allocated PE 32767 PV UUID 73jNBw-GVPw-Wtob-FD3g-r3uU-gsib-Acxjo8 root@vmcnszs218:/home/szscm# vgdisplay --- Volume group --- VG Name vg1 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 0 Max PV 0 Cur PV 1 Act PV 1 VG Size <128.00 GiB PE Size 4.00 MiB Total PE 32767 Alloc PE / Size 32767 / <128.00 GiB Free PE / Size 0 / 0 VG UUID xDrErD-tq0K-qETy-ICnE-QaL5-qpjt-7CjTWN root@vmcnszs218:/home/szscm# lvdisplay --- Logical volume --- LV Path /dev/vg1/lv1 LV Name lv1 VG Name vg1 LV UUID ns20pO-ow9P-eeFR-56xW-p8L0-lVHM-xEJ7GE LV Write Access read/write LV Creation host, time vmcnszs212, 2020-07-23 01:56:15 +0000 LV Status available # open 0 LV Size <128.00 GiB Current LE 32767 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 -
挂载逻辑卷
root@vmcnszs218:~# mount /dev/vg1/lv1 /home2/ root@vmcnszs218:~# ls snap root@vmcnszs218:~# cd /home2/ root@vmcnszs218:/home2# ls lost+found share test至此，磁盘迁移完毕。
其它
另外实践也发现，不做任何操作，直接关掉旧主机，拔掉硬盘；然后将硬盘安装到新主机并且开机后，能够直接看到 /dev/vg1/lv1 并且挂载后能够直接看到原主机 /dev/sdb 的内容（可能是磁盘的结构一样都是两个磁盘的原因吧）。
