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Disk group missing after server reboot in RHEL 5.9 VM

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http://www.linuxquestions.org – Hi, I added a disk of 100GB to my VM, partitioned it with 8e LVM partition then created physical volume, volume group and logical volume by normal process and then formatted it with ext3 file system and then mounted it on a directory. After VM reboot it went into maintenance mode when checked found that volume group was missing and even disk was without partition table defined. I redefined the partition table and activated the volume group with vgchange cmd. Then rebooted the system again and it came up fine without any issue. I would like to know the cause of volume group missing initiall (HowTos)