The difference between centos7 and centos6

The difference between centos7 and centos6:

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1. The difference between file systems. CentOS6 uses the ext4 file system by default, while CentOS7 uses xfs.

2. The default hard disk scheduling algorithms are different. CentOS6 uses cfq by default, while CentOS7 uses deadline.

3. The kernel versions are different. CentOS6 uses 2.6 and CentOS7 uses 3.10

4. In CentOS7, it supports the dynamic patch mechanism kpatch and btrfs file system (technology preview)

5. In CentOS7, it supports the kernel Module blacklist mechanism: modproble.blacklist=module

6. In CentOS7, nested virtualization technology is supported, which makes the virtual machine CPU smoother

7. In CentOS7, the kernel supports resources Tuning and allocation (cgroup)

8, CentOS6 supports USB2.0, CentOS7 supports USB3.0

9, lvm snapshot. Support qcow2 format file snapshot

10 in CentOS7, and strengthen technical support for VMware. Comes with open-vmtools to replace vm-tools

11. Start the tool. Use the new service startup manager systemctl in CentOS7 to start and stop services in CentOS6

12. When a kernel error occurs in CentOS7, the exported core file supports a maximum of 3TB, and a maximum of 2TB is supported in CentOS6

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