Udev Raw Bare Equipment asmlib Difference

The asmlib is a sign of the ASM above the disk/partition header on Linux for use by ASM and does not affect ASM disk when the drive letter changes.

In effect, there is no essential difference from Udev, in Redhat 4 and 5 Oracle provides ASMLIB program, in 6, Oracle only for OEL, other Linux no longer provide

The Udev is designed to prevent the ASM Disk group from failing to mount due to a change in the disk character as a result of a reboot, resulting in the inability of ASM disks to be used properly by DG

Raw is a commonly used method of binding raw devices in the previous 4, and after 5.4 or 5.5, this method is not recommended and is used directly to replace it with Udev.

Supplementary Note:
Now deployed systems, most of them are more than 5.5, in the absence of the use of multipath, the proposed use of udev, in the use of multipath, the direct use of multiple paths can be, without Asmlib/udev/raw, multipath permissions in the rc.local configuration
asmlib is a Linux above the disk/partition header with ASM on the mark, for ASM to use, and when the disk character changes, will not affect the ASM disks, in effect, and udev no essential difference, in Redhat Oracle in 4 and 5 provides asmlib programs, in 6, Oracle is provided only for OEL, and other Linux is no longer available

The Udev is designed to prevent the ASM Disk group from failing to mount due to a change in the disk character as a result of a reboot, resulting in the inability of ASM disks to be used properly by DG

Raw is a commonly used method of binding raw devices in the previous 4, and after 5.4 or 5.5, this method is not recommended and is used directly to replace it with Udev.

Supplementary Note:
Now deployed systems, most of them are more than 5.5, in the absence of the use of multipath, the proposed use of udev, in the use of multipath, the direct use of multiple paths can be, without Asmlib/udev/raw, multipath permissions in the rc.local configuration