Mar 1 03:59:37 localhost dhclient: DHCPREQUEST on eth2 to 255.255.255.255 port 67 (xid=0x2ca991e4)
Mar 1 03:59:38 localhost dhclient: DHCPACK from 192.168.93.254 (xid=0x2ca991e4)
Mar 1 03:59:38 localhost dhclient: bound to 192.168.93.95 -- renewal in 1642 seconds.
Mar 1 04:17:44 localhost dhclient: DHCPREQUEST on eth1 to 192.168.0.254 port 67 (xid=0x1b7709c2) #这行是虚拟机网卡发出DHCP请求数据包
Mar 1 04:17:44 localhost dhclient: DHCPACK from 192.168.0.254 (xid=0x1b7709c2) #做出正常应答
Mar 1 04:17:44 localhost dhclient: bound to 192.168.0.65 -- renewal in 1596 seconds. #IP绑定通信正常
Mar 1 04:26:59 localhost dhclient: DHCPREQUEST on eth2 to 192.168.93.254 port 67 (xid=0x2ca991e4) #这行是虚拟机网卡发出DHCP请求数据包
Mar 1 04:27:32 localhost last message repeated 3 times #本地上一次消息的重复次数
Mar 1 04:27:47 localhost dhclient: DHCPREQUEST on eth2 to 192.168.93.254 port 67 (xid=0x2ca991e4) #这行是虚拟机网卡发出DHCP请求数据包
Mar 1 04:28:57 localhost last message repeated 5 times #本地上一次消息的重复次数
Mar 1 04:29:01 localhost kernel: ata1.00: exception Emask 0x0 SAct 0x7fffffff SErr 0x0 action 0x6 frozen #本机的硬盘SATA SActive 寄存器端口被冻结为EH，无法写入
Mar 1 04:31:30 localhost dhclient: DHCPREQUEST on eth2 to 192.168.93.254 port 67 (xid=0x2ca991e4) #这行是虚拟机网卡发出DHCP请求数据包
Mar 1 04:31:30 localhost gconfd (prod-5302): Received signal 15, shutting down cleanly #此刻接收信号：注销登出当前用户
Mar 1 04:31:30 localhost kernel: ata1.00: cmd 61/10:00:d0:b1:26/00:00:03:00:00/40 tag 0 ncq 8192 out #ncq报错
看message的ncq报错解决方法1：
vi /etc/default/grub #禁用ncq，启动项中加入libata.force=noncq
GRUB_CMDLINE_LINUX="rhgb quiet libata.force=noncq" #修改之后，保存重启电脑
方法2：
vim /boot/grub2/grub.cfg
libata.force=noncq #加到rhgb quiet后面
