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I recently installed Debian Wheezy on a server with 24TB of storage (RAID 6). When I partitioned the big volume I selected Manual option and created the partition scheme.

When I was partitioning, I observed that Debian automatically created two small partitions of 1MiB (one at beginning and another at end of disk). I inmediately remembered that this space was probably being allocated for GPT BIOS Boot Partition so I didn't worry about it and I left them there.

However, when I installed a new kernel through Debian updates and GRUB was reinstalled I received the next error message:

/usr/sbin/grub-setup: warn: This GPT partition label has no BIOS Boot
Partition; embedding won't be possible!

/usr/sbin/grub-setup: warn: Embedding is not possible.  GRUB can only
be installed in this setup by using blocklists. However, blocklists
are UNRELIABLE and their use is discouraged.

Installation finished. No error reported.

This message is fairly clear. However, despite GRUB was correctly installed and this server is booting fine, I would like to avoid this problem.

If I execute parted I can see that this space is being identified as free so my question is: Could I use parted to create a new partition in this free space (at beginning or end of disk) and set it as GPT BIOS Boot Partition (set [num] bios_grub on)? Could it be risky to do it now (after installation)?

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Try and see? It should work fine. –  frostschutz Oct 26 '13 at 20:47

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