EMC存储配置udev文件格式不一样，起码与IBM等存储不一样，所以这里特别记录之，需要在/etc/udev/rules.d 目录上新增了50-udev.rules 文件，redhat 5 下面就有这个文件，到redhat 6下就没了,并把下列信息加入50-udev.rules，现在在oracle上已经可以正常安装asm了
vi /etc/udev/rules.d/50-udev.rules
SUBSYSTEM=="block", KERNEL=="emcpowera1", GROUP="asmadmin", OWNER="grid", MODE="0660"
SUBSYSTEM=="block", KERNEL=="emcpowerb1", GROUP="asmadmin", OWNER="grid", MODE="0660"
SUBSYSTEM=="block", KERNEL=="emcpowerc1", GROUP="asmadmin", OWNER="grid", MODE="0660"
SUBSYSTEM=="block", KERNEL=="emcpowerd1", GROUP="asmadmin", OWNER="grid", MODE="0660"
SUBSYSTEM=="block", KERNEL=="emcpowere1", GROUP="asmadmin", OWNER="grid", MODE="0660"
SUBSYSTEM=="block", KERNEL=="emcpowerf1", GROUP="asmadmin", OWNER="grid", MODE="0660"
SUBSYSTEM=="block", KERNEL=="emcpowerg1", GROUP="asmadmin", OWNER="grid", MODE="0660"
SUBSYSTEM=="block", KERNEL=="emcpowerh1", GROUP="asmadmin", OWNER="grid", MODE="0660"
SUBSYSTEM=="block", KERNEL=="emcpoweri1", GROUP="asmadmin", OWNER="grid", MODE="0660"
SUBSYSTEM=="block", KERNEL=="emcpowerj1", GROUP="asmadmin", OWNER="grid", MODE="0660"
SUBSYSTEM=="block", KERNEL=="emcpowerk1", GROUP="asmadmin", OWNER="grid", MODE="0660"