虚拟机断电后centos7无法正常启动

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报错如图：

[ 2.430354] sd 0：0：0：0： [sda] Assuming drive cache： write through
[ 3.852S62] XFS (dm-0)： Metadata corruption detected at xfs_agi_write_verify+8xb5/0>«:0 [xfs]> xfs
_agi block 0xl?7f002
[ 3.852991] XFS (dm-0): Unmount and run xfs_repair
[ 3.853004] XFS (dm-0)： First 64 bytes of corrupted metadata buffer：
[ 3.053019] ffff9bef?5d3a6的：58 41 4? 49 00 00 00 01 00 00 00 01 00 2e fe 00 XAGI........................
[ 3.053039] ffff9bef?5d3a610: 00 00 48 00 00 01 3d 16 00 00 00 02 00 00 00 8d ........
[ 3.0530591 ffff9bef?5d3a620： 00 0a 5b 40 ff ff ff ff ff ff ff ff ff ff ff ff ••[(?......................
[ 3.053079] ffff9bef75d3a630： ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ....................
[ 3.853102] XFS (dm-0)： Corruption of in-memory data detected. Shutting down filesystem
[ 3.853121] XFS (dm-0)： Please umount the filesystem and rectify the problem(s)
[ 3•0M521] systemd-fstab-generator[444]: Failed to open /sysroot/etc/fstab: Input/output error
Generating "/run/in itramfs/rdsosreport.txt"
Entering emergency mode. Exit the shell to continue.
Type "journaletl” to view system logs.
You might want to save "/run/initramfs/rdsosreport.txt" to a USB stick or /boot
after mounting them and attach it to a bug report.

参照网上的解决方法是：

xfs_repair /dev/dm-0

我用上面这个方法确实解决了我的node01节点，但是我们的master节点执行这个命令的时候报错：

xfs_repair： cannot open /dev/dm-0: Device or resource busy

然后我又仔细看报错提示，看到了关键一条信息：

[ 3.852991] XFS (dm-0): Unmount and run xfs_repair

系统提示我，需要先umount，再执行 xfs_repair 命令
所以，需要先umount，但是没有提示需要umount 什么东西，dm-0 是centos-root 的软连接，所以

umount /dev/mapper/centos-root
xfs_repair -v -L /dev/mapper/centos-root
reboot

虚拟机又可以重新使用了