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案例环境：
操作系统版本： Red Hat Enterprise Linux Server release 5.7 64bit
数据库版本 ： 5.6.19 MySQL Community Server
AutoMySQLBackup： Automysqlbackup-v3.0_rc6
案例场景：
AutoMySQLBackup 3.0版本备份时，出现告警错误“du: WARNING: use --si, not -H; the meaning of the -H option will soon change to be the same as that of --dereference-args (-D)” 具体信息请见下面：
==============================================================================
Total disk space used for backup storage...
Size - Location
1.8M /u01/db_backup/mysqlbackup/
==============================================================================
###### WARNING ######
Errors reported during AutoMySQLBackup execution.. Backup failed
Error log below..
du: WARNING: use --si, not -H; the meaning of the -H option will soon
change to be the same as that of --dereference-args (-D)
================================== End of Backup =============================
==============================================================================
出现这个错误是因为在 Red Hat Enterprise Linux 5.7上的du命令不符合POSIX标准规范。具体参考官方的
The POSIX specifications are. It seems, that the Centos 5.7 version of du is not POSIX compliant, but will soon be. I have done my best to use only POSIX compliant syntax to assure the bug-free running on most systems. Unfortunately, I can't take care of every system and distribution, which chooses to defy POSIX syntax. For other people and myself, it would be a good idea to get the options of du on Centos 5.7, so please post 'du --help'.
如下所示，在命令du --help中，你就能从帮助信息中看到下面信息：
可 以通过修改脚本/usr/local/bin/automysqlbackup 找到下面脚本，修改脚本将“ echo `du -hsH "${CONFIG_backup_dir}"` 修改为 echo `du -hs "${CONFIG_backup_dir}"` 即可解决问题。
在Red Hat Enterprise Linux Server release 6.6 就不会有这个问题，它的du版本为8.4， Red Hat Enterprise Linux 5.7上的du命令版本为du (GNU coreutils) 5.97
# du --version
du (GNU coreutils) 8.4
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