using wedges without GPT

[Frank Wille <frank%phoenix.owl.de@localhost>]

Hi,

I made a mistake today. I upgraded my NetBSD/sandpoint NAS (Synology
DS-209j) from two 2TB to two 4TB disks - and completely forgot about the
MBR/disklabel limit of 2TB!

The sandpoint boot-loader (altboot(8)) only knows about disklabel, MBR and
RAID. No GPT-boot.

Which options do I have to use the remaining space (preferably with RAID)?


My first Idea was to install the NetBSD-root into a few GBs at the beginning
of the disk and then try to mount the rest of it via wedges. But while
testing with
# dkctl wd0 addwedge testwedge 150000000 1000000 ffs
I received a "Device busy" error. Why?

I have an MBR with a disklabel for the first 64GB of the disk only. The
remaining part of it cannot be busy.


Can I greate a GPT with hybrid MBR? gpt(8) shows
  -H   Ignore existing MBR (Hybrid MBR/GPT mode).
but has no information how to create such a hybrid table.

The info for "gpt create" indicates that the MBR is lost.

Thanks in advance!

-- 
Frank Wille