From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alfred Matthews <asm13243546@gmail.com>
Subject: Re: on assembly and recovery of a hardware RAID
Date: Mon, 20 Mar 2017 17:42:05 -0400
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>> *** Checking Backup Volume Header:
>> Unexpected Volume signature '  ' expected 'H+'
>
> Here the backup volume header, which is 2 blocks (blocks are 8K) from
> the end of the device, looks wrong.
> This probably means the chunk size is wrong.
> I would suggest trying different chunksizes, starting at 4K and
> doubling, until this message goes away.
> That still might not be the correct chunk size, so I would continue up
> to several megabytes and find all the chunksizes that seem to work.
> Then look at what else hpfsck says on those.

I'm not actually able to generate happy output in hpfsck using any of
the following multiples of 4K

4
[...]
8192
16384
32768
65536
131072
262144
524288
1048576
2097152

Any chance it's not really an HFS system at all?