• df命令查看，显示/dev/vda，而不是sda或hda ，为什么？

　　　　虚拟机为了提升性能,一般使用virtio作为磁盘驱动,在虚拟机里面磁盘会显示成vda而不是传统的sda,有什么办法可以让他显示成sda还不影响正常使用呢

　　　　/dev/vdx is for virtual (hard) disk drives. All the kernel does when it is I/O'd to is tell the virtualization software that bits need to be read/written and it's done. In general, vdx is faster because the kernel doesn't need to tell the hard drive to do a whole bunch of random junk that really shouldn't be needed because it just needs to tell the VM hypervisor to do stuff.