I have had a few virtual machine installations come up with "gptboot:
invalid GPT backup header" error message while booting. (some
immediately on first boot after install) They still boot fine, and run
without problems, but I would like to find a way to fix the problem.
Does anyone know how you can write a new GPT backup header to the
partition table. I have even gone to the extent of adding a second
virtual disk, using gpart to create a partition table and then add new
partitions and setup bootstrap then use cpio to copy data over and
switched the drive SCSI IDs within the virtual machines configuration to
boot from the second drive instead. Still same error message when
booting off the new drive. I did however leave out the size option when
creating the last UFS partition so it may have filled to the end and
overwrote the backup GPT table.
I have searched online for a solution to recreating the backup GPT
header from the main header, but I have been unable to find anything.
Not sure if I am missing something simple, if no one else has had this
problem, or if others are just ignoring it since their system works even
with it? All the machines with the problem are VMware hosted machines,
some on ESX, and some on VMware Workstations.
--
Thanks,
Dean E. Weimer
http://www.dweimer.net/
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