解决了如下问题：
1.启动的时候报错，需要等30秒才能启动的问题
错误日志如下：
kernel: ata2: soft resetting port
kernel: ata2: softreset failed (1st FIS failed)
kernel: ata2: port failed to respond (30 secs)
kernel: ata2: COMRESET failed (device not ready)
5.1解决了这个问题，据说是某个内核版本的问题。
2.解决了DELL Vostro 200网卡驱动和其他设备驱动的问题
其实就是集成了Intel的ICH9系列的驱动，包括Intel Corporation 82G33/G31/P35/P31。自动识别设备如下：
# lspci
00:00.0 Host bridge: Intel Corporation 82G33/G31/P35/P31 Express DRAM Controller (rev 02)
00:01.0 PCI bridge: Intel Corporation 82G33/G31/P35/P31 Express PCI Express Root Port (rev 02)
00:02.0 VGA compatible controller: Intel Corporation 82G33/G31 Express Integrated Graphics Controller (rev 02)
00:19.0 Ethernet controller: Intel Corporation 82562V-2 10/100 Network Connection (rev 02)
00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 02)
00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 02)
00:1a.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 02)
00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 02)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 92)
00:1f.0 ISA bridge: Intel Corporation 82801IR (ICH9R) LPC Interface Controller (rev 02)
00:1f.2 RAID bus controller: Intel Corporation 82801 SATA RAID Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 02)
之前的RHEL 5就算我手动装上Intel的网卡驱动，网卡还是显示为unknown device。
使用5.1以后，在安装的过程中就自动识别了网卡。
这是RHEL 5识别的硬件设备，同样的硬件配置：
# lspci
00:00.0 Host bridge: Intel Corporation DRAM Controller (rev 02)
00:01.0 PCI bridge: Intel Corporation PCI Express Root Port (rev 02)
00:02.0 VGA compatible controller: Intel Corporation Integrated Graphics Controller (rev 02)
00:19.0 Ethernet controller: Intel Corporation Unknown device 10c0 (rev 02)
00:1a.0 USB Controller: Intel Corporation USB UHCI Controller #4 (rev 02)
00:1a.1 USB Controller: Intel Corporation USB UHCI Controller #5 (rev 02)
00:1a.2 USB Controller: Intel Corporation USB UHCI Controller #6 (rev 02)
00:1a.7 USB Controller: Intel Corporation USB2 EHCI Controller #2 (rev 02)
00:1b.0 Audio device: Intel Corporation HD Audio Controller (rev 02)
00:1d.0 USB Controller: Intel Corporation USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation USB UHCI Controller #3 (rev 02)
00:1d.7 USB Controller: Intel Corporation USB2 EHCI Controller #1 (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 92)
00:1f.0 ISA bridge: Intel Corporation Unknown device 2916 (rev 02)
00:1f.2 RAID bus controller: Intel Corporation 82801HR/HO/HH (ICH8R/DO/DH) SATA RAID Controller (rev 02)
00:1f.3 SMBus: Intel Corporation SMBus Controller (rev 02)
3.可以使用yum自动升级
CentOS最爽的地方，不止免费获取，而且可以自动升级。
关于CentOS，CentOS其实就是RHEL的重新打包发布版，去掉了Redhat的标志，fix了一些bug（因为它比对应的RHEL版本晚发布。）
