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linux boot issue- VolGroup issue

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http://serverfault.com – I have cent OS with XEN installed on a blade server. After installing Cent OS I changed its Volumegroup from VolGroup00 to VolGroup01 using command 'vgrename' as I needed to access the Volgroups of VMs I was going to install on this base cent os. After this everything worked fine, and I achieved my objective. But this weekend there was power shutdown in our lab and today when booted these blade servers, CentOSes installed on them are not coming up. Error was 'could not found VolGroup00, unable to locate */dev/root*'. So system was rebooting again and again. From this error I realized that in (HowTos)