> I am using mdadm to create raid on a jbod. Sometimes the rebuild process > of the raid failed, and some of the active disks became faulty. > Does someone konwns when a disk will become faulty? Running 'smart' on a disk in the jobd will tell you if the disk itself is showing signs of becoming faulty. There are also other possible causes, including controller failure and bad cables. I'd need more information about what exactly is failing, and how, before I can give you a better answer. > How does a raid that is created by mdadm failed? Usually because a drive failed. See my previous answer for why. > What is the process of the raid that is rebuilding. Not sure what you mean. We need a bunch more information about what is failing, logs showing what is happening, etc before we can really begin to offer any answers. -- Drew "Nothing in life is to be feared. It is only to be understood." --Marie Curie -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html