<html><head><style type="text/css"></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV>I have a need to edit the metadata on an LVM2 PV. It is a storage managed snapshot of a LVM VG.</DIV> <DIV> </DIV> <DIV>It appears I can alter the metadata contents that are in the first 128KB of the device (/dev/sda) using dd and vi.</DIV> <DIV> </DIV> <DIV>However, after I edited the LABELONE area where the binary copy of the PV UUID is stored (200x offset area) and the ASCII version at 12b0x and 16b0x and reboot - vgscan no longer recognizes the VG.</DIV> <DIV> </DIV> <DIV>Question - are all the UUID's - VG, LV, PV generated as a self-check hash to ensure they haven't been bit-picked or otherwise compromised by the storage??</DIV> <DIV> </DIV> <DIV>I have downloaded the source, but am not sure yet where to find the code that generates the UUID strings.</DIV> <DIV> </DIV> <DIV>Thanks,</DIV> <DIV>Mike</DIV></div><br> </body></html>