From owner-freebsd-geom@FreeBSD.ORG  Mon Oct 17 02:43:17 2011
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From: Garrett Cooper <yanegomi@gmail.com>
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Date: Sun, 16 Oct 2011 19:43:13 -0700
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To: Xin LI <delphij@gmail.com>
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Cc: Xin LI <delphij@freebsd.org>, freebsd-geom@freebsd.org
Subject: Re: GELI devices produced with 9.0+ fail when mounted on 8.2, etc?
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On Oct 16, 2011, at 5:32 PM, Xin LI wrote:

> On Sun, Oct 16, 2011 at 5:01 PM, Garrett Cooper <yanegomi@gmail.com> =
wrote:
> [...]
>>        The attach will fail with the following message:
>>=20
>> geli: MD5 hash mismatch for /dev/md0.
>=20
> I'm pretty sure that this is from userland, and because FreeBSD 9.x
> have support of GELI metadata version 6, while 8.2 have support up to
> metadata version 5.  It's not a regression IMHO.

In other words this is a design flaw, because geli metadata is only =
forwards compatible. One of FreeBSD's claims to fame is its backwards =
compatibility -- why aren't geom developers adhering to this?
Thanks,
-Garrett=