Raid5 Online HDD Build Prob

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http://www.linuxquestions.org – hai, for the troubleshooting of one server (having 73Gb 3HDD, Raid5 of 140Gb) When I check in the Array The Logical Vol Appears as One HDD not Online 0 HDD1 1 HDD2 2 HDD3 0 HDD not showing Online, When we set it for Oneline & save, After restarting it will go off, kindly suggest me to do the best (HowTos)