On Fri, Dec 09, 2022 at 04:19:49PM +0000, James Johnson wrote:
> Hi all,
>
> I have installed an internal hard drive of 4TB. This drive will be used for
> storing data only. It will not contain the OpenBSD system itself.
>
> Knowing the limitations of MBR, I have opted for a GPT partitioning system :
> fdisk -A sd0
If the disk is to be used exclusively with OpenBSD, you can use an MBR
partitioning system, even though it's 4 TB.
> Following this, I am trying to add the partition with disklabel.
>
> I have created the a partition, of 2TB (the size suggested by the system).
> Then I try to add another partition, but disklabel tells me I have no space
> remaining.
>
> I am stuck. The only option that seems relevant in the man page is to modify
> the boundary with the -b option. I am scared to do so without specific advice
> though, as it could corrupt the OS if done improperly, from what the manual
> says.
>
> I just want to be able to use the full size of the disk. Ideally, I would
> like a single 4TB partition, but if not possible, I am fine with 2 partitions
> of 2TB.
>
> Any recommendation?
For use with OpenBSD only, create a single MBR partition covering as much of
the disk as is possible with MBR, something like:
Disk: sd1 geometry: 267349/255/63 [4294961685 Sectors]
Offset: 0 Signature: 0xAA55
Starting Ending LBA Info:
#: id C H S - C H S [ start: size ]
-------------------------------------------------------------------------------
0: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused
1: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused
2: 00 0 0 0 - 0 0 0 [ 0: 0 ] unused
*3: A6 0 1 2 - 267348 254 63 [ 64: 4294961621 ] OpenBSD
Then invoke disklabel -E, and adjust the bounds to fill the whole disk with the
b option, giving * as the size.
Finally, add a single large partition covering the whole disk in the normal way.
