一种恢复无法启动的虚拟机中的数据的方法
使用VirtualBox或者Vmware虚拟机的时候,可能由于程序错误或者异常关机,导致系统无法启动,碰到这种情况该怎么恢复之前虚拟机里的数据呢?
一个可行的办法是重新建一个虚拟机,确定它能够运行之后,把之前虚拟机的虚拟磁盘也挂载上。考虑到默认同一个SATA控制器上无法区别同一个同名卷,需要把老的虚拟机的磁盘挂载到IDE控制器上。
如下面基于Oralc VM VirtualBox的截图所示:
完成之后,重新启动虚拟机,发现能发现老磁盘上的卷组。但由于新系统和老系统都是基于同一个导出的虚拟机镜像制作的,此时系统中出现了同名的卷,导致老虚拟机上的盘无法自动导入。那么又如何解决这一新的问题呢?
1.首先,确定不能自动挂载的vg的uuid:
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lvm vgdisplay
lvm> vgdisplay --- Volume group --- VG Name centos System ID Format lvm2
Metadata Areas 1 Metadata Sequence No 5 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 0 Max PV 0 Cur PV 1 Act PV 1 VG Size 63.51 GiB PE Size 4.00 MiB Total PE 16258 Alloc PE / Size 16242 / 63.45 GiB Free PE / Size 16 / 64.00 MiB
VG UUID bX2g0F-S2gA-7fjc-yj2e-qkeR-ImE9-mkp1xu |
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--- Volume group --- VG Name centos System ID Format lvm2
Metadata Areas 1 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 3 Max PV 0 Cur PV 1 Act PV 1 VG Size 255.51 GiB PE Size 4.00 MiB Total PE 65410 Alloc PE / Size 65394 / 255.45 GiB Free PE / Size 16 / 64.00 MiB
VG UUID ydgLeu-Wt4t-PQ4u-fq1o-XJ8r-JsKH-qwQtyU |
可以看到上面有两个同名的VG,结合mount命令,可以发现uuid为bX2g0F-S2gA-7fjc-yj2e-qkeR-ImE9-mkp1xu的卷组但无法自动挂载。
2.为此,需要重命名老的重名卷组:
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lvm vgrename bX2g0F-S2gA-7fjc-yj2e-qkeR-ImE9-mkp1xu centos-1 |
3.再次确认修改过成功:
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lvm> vgdisplay --- Volume group --- VG Name centos-1 System ID Format lvm2
Metadata Areas 1 Metadata Sequence No 5 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 0 Max PV 0 Cur PV 1 Act PV 1 VG Size 63.51 GiB PE Size 4.00 MiB Total PE 16258 Alloc PE / Size 16242 / 63.45 GiB Free PE / Size 16 / 64.00 MiB
VG UUID bX2g0F-S2gA-7fjc-yj2e-qkeR-ImE9-mkp1xu |
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--- Volume group --- VG Name centos System ID Format lvm2
Metadata Areas 1 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 3 Max PV 0 Cur PV 1 Act PV 1 VG Size 255.51 GiB PE Size 4.00 MiB Total PE 65410 Alloc PE / Size 65394 / 255.45 GiB Free PE / Size 16 / 64.00 MiB
VG UUID ydgLeu-Wt4t-PQ4u-fq1o-XJ8r-JsKH-qwQtyU |
4.重新**由于同名没法自动加载的卷组
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dev]# lvscan inactive '/dev/centos-1/swap' [2.00 GiB] inherit
inactive '/dev/centos-1/home' [20.16 GiB] inherit
inactive '/dev/centos-1/root' [41.29 GiB] inherit
ACTIVE '/dev/centos/swap' [3.88 GiB] inherit
ACTIVE '/dev/centos/home' [201.57 GiB] inherit
ACTIVE '/dev/centos/root' [50.00 GiB] inherit
dev]# ls /dev/centos/ home root swap
dev]# vgchange -ay /dev/centos-1 3 logical volume(s) in volume group "centos-1" now active dev]# lvscan ACTIVE '/dev/centos-1/swap' [2.00 GiB] inherit
ACTIVE '/dev/centos-1/home' [20.16 GiB] inherit
ACTIVE '/dev/centos-1/root' [41.29 GiB] inherit
ACTIVE '/dev/centos/swap' [3.88 GiB] inherit
ACTIVE '/dev/centos/home' [201.57 GiB] inherit
ACTIVE '/dev/centos/root' [50.00 GiB] inherit
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5.检查是否自动挂载lv
重启系统之后,运行下面的命令:
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dev]# cd /dev/mapper/ mapper]# ls centos--1-home centos--1-root centos--1-swap centos-home centos-root
centos-swap control mapper]# ls -alrt total 0 crw-------. 1 root root 10, 236 Jul 16 22:34 control
lrwxrwxrwx. 1 root root 7 Jul 16 22:34 centos-swap -> ../dm-1
lrwxrwxrwx. 1 root root 7 Jul 16 22:34 centos-root -> ../dm-0
lrwxrwxrwx. 1 root root 7 Jul 16 22:34 centos-home -> ../dm-2
drwxr-xr-x. 21 root root 3280 Jul 16 23:44 .. lrwxrwxrwx. 1 root root 7 Jul 16 23:44 centos--1-swap -> ../dm-3
lrwxrwxrwx. 1 root root 7 Jul 16 23:44 centos--1-root -> ../dm-5
lrwxrwxrwx. 1 root root 7 Jul 16 23:44 centos--1-home -> ../dm-4
drwxr-xr-x. 2 root root 180 Jul 16 23:44 .
mapper]# mount /dev/dm- dm-0 dm-1 dm-2 dm-3 dm-4 dm-5
mapper]# mount /dev/dm-4 /mnt/ mapper]# ls /mnt/ baba worker
mapper]# |
通过上面命令可以看到,之前不能挂载的卷组已经可以自动挂载了。
参考链接:http://www.92csz.com/47/736.html
本文转自存储之厨51CTO博客,原文链接: http://blog.51cto.com/xiamachao/1951293,如需转载请自行联系原作者