How To Setup ASM on Linux Using ASMLIB Disks, Raw Devices or Block Devices? [ID 580153.1]
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Do NOT use a LVM for creating ASM devices. They should be RAW devices, the partition should be the ENTIRE disk minus the first 1M (start at cylinder 2). Also do NOT use ASMLib - it is being retired and will not be available for future versions of Linux. Get a copy of "Automatic Storage Management - Under-the-Hood - a Practical Deployment Guide. It does reference ASMLib - but it is not necessary.