> Did you use the trick by changing the partitions to > linux raid > autodetect ? >To my knowledge most of your questions are >answered in the >howto's. See >www.tldp.org >for software raid howto, and LVM howto Hi JonB I've set the "persistent_superbit 1" in raidtab all disk partition type were also all " raid auto detect" then if I delete the original raidtab file and reboot. the system couldn't find the raid device, the LVM coundn't find the volume either. does md have to depend on the raidtab file? Rocky Lee _______________________________________________ linux-lvm mailing list linux-lvm@sistina.com http://lists.sistina.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/