Redhat smartd failed
在启动Redhat时，出现了 smartd [failed] ，查阅网上的资料后才知道，后把他禁用了……
参考：smartd 百度百科 http://baike.baidu.com/view/2339515.htm
风云际会博客：http://hi.baidu.com/lpwok/blog/item/137c44dee1aad81a632798c5.html#send
其实smartd是一个守护进程（一个帮助程序），它能监视拥有自我监视，分析和汇报技术(Self-Monitoring,
Analysis, and Reporting Technology - SMART)的硬盘。
SMART系统使得硬盘能监视并汇报自己的运行状况。它的一个重要特性是能够预测失败，使得系统管理员
能避免数据丢失。
smartd由kernel-utils包缺省安装。用命令 rpm -ql kernel-utils 可以列出kernel-utils包中的文件。
smartd守护进程通常在系统启动的时候被开启，它的配置文件是/etc/smartd.conf。
比如，假设有两个硬盘被安装，/dev/hda和/dev/hdb。一个是CD_ROM设备，另一个是硬盘。为了检测它们
是否支持SMART，使用命令 smartctl -i /dev/hda 和 smartctl -i /dev/hdb：
# /usr/sbin/smartctl -i /dev/hda
smartctl version 5.1-11 Copyright (C) 2002-3 Bruce Allen
Home page is http://smartmontools.sourceforge.net/
=== START OF INFORMATION SECTION ===
Device Model: ST380011A
Serial Number: 3JVB672N
Firmware Version: 8.01
Device is: Not in smartctl database [for details use: -P showall]
ATA Version is: 6
ATA Standard is: ATA/ATAPI-6 T13 1410D revision 2
Local Time is: Fri Aug 20 14:09:16 2004 EST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
”SMART support is: Available - device has SMART capability.“这行说明支持SMART。"SMART
support is: Enabled”这行说明SMART已经被打开。
CD-ROM设备和旧式的硬盘不支持SMART，这可以从smartctl -i /dev/hdb的输出看出：
# /usr/sbin/smartctl -i /dev/hdb
smartctl version 5.1-11 Copyright (C) 2002-3 Bruce Allen
Home page is http://smartmontools.sourceforge.net/
=== START OF INFORMATION SECTION ===
Device Model: LTN526D
Serial Number: [No Information Found]
Firmware Version: 9S03
Device is: Not in smartctl database [for details use: -P showall]
ATA Version is: 1
ATA Standard is: Exact ATA specification draft version not indicated
Local Time is: Fri Aug 20 14:24:43 2004 EST
SMART is only available in ATA Version 3 Revision 3 or greater.
We will try to proceed in spite of this.
SMART support is: Unavailable - device lacks SMART capability.
A mandatory SMART command has failed: exiting. To continue, use the -T
option to set the tolerance level to 'permissive'
注意有些硬盘控制器不支持SMART。比如有些硬件RAID控制器不支持，或者不会传递SMART信息，即使加入
的硬盘支持SMART。
可以修改/etc/smartctl.conf文件，使得smartd只监视你想监视的设备。假设只有/dev/hda需要被监视，
在该设备上如果有警告信息发生，需要把它发给根用户，那么/etc/smartd.conf需要这样修改：
# /etc/smartd.conf
# Sample configuration file for smartd. See man 5 smartd.conf.
# Home page is: http://smartmontools.sourceforge.net
...
# A very silent check. Only report SMART health status if it fails
# But send an email in this case
/dev/hda -a -m [email protected] ...
编辑完/etc/smartd.conf，重启该守护进程：
# /sbin/service smartd restart
Shutting down smartd: [FAILED]
Starting smartd: [ OK ]
要设置smartd在系统启动时候被激活，在根用户下用 chkconfig smartd on 命令。
关闭smartd服务自动启动
root LINUX smartd is a daemon that monitors the Self-Monitoring, Analysis and Reporting
Technology (SMART) system built
into many ATA-3 and later ATA, IDE and SCSI-3 hard drives. The purpose of SMART is to
monitor the reliability
of the hard drive and predict drive failures, and to carry out different types of
drive self-tests. This
version of smartd is compatible with ATA/ATAPI-7 and earlier standards
简单地说，smartd是监控硬盘的可靠性并预测其失败、进行测试的守护进程！
仔细看看smartd的说明即可！（man smartd）
＃chkconfig smartd off
这是关闭smartd服务自动启动，机器重新启动时smartd不再运行！