Either way works great. Both ways have their benefits, pains and pitfalls. It 
depends on your use case, configuration, hardware, adversaries, etc. Like most 
security solutions, the devil, and weaknesses, lay in the details, like network 
engineering and key management. Care to elaborate for us?

By the way, I'll just point out, always, and now more so than ever in light of 
NSA and TAO, that full disk encryption is not the magic bullet we'd hope. About 
all you should expect from GELI is that it makes hard drive _disposal_ safer 
and easier at a drives EOL, and even then not totally so. That being said, 
there is a worthwhile benefit _possible_ to achieve in the use case of a 
portable device and many a data breach would have been prevented by proper 
application of GELI in that circumstance.

"Highly available" servers have a lot less practical use for GELI especially if 
either is colocated. If both of your HAST nodes are in your own facilities and 
you have a tight and practiced mayday procedure, perhaps in addition to an 
automated system to trigger panic mode, it has some very good merit.

In other cases software based full disk encryption is really only going to 
thwart or inconvenience the weakest of adversaries, which of course may be all 
you need or the best you can hope for. I use GELI almost everywhere and I've 
deployed it both ways with HAST depending on the situation. Neither can be 
credited as the reason I get any sleep at night (simple exhaustion and 
unimportance in the cosmic scale are what do it for me) though they can 
certainly have their place in a well thought out security plan/procedure, if 
such a thing exists.

> On Dec 30, 2013, at 5:58 PM, Karl Pielorz <[email protected]> wrote:
> 
> 
> Hi All,
> 
> As I don't currently have the requisite two boxes to try this... Is it likely 
> / possible you can use HAST with GELI? - i.e. to have a highly available, but 
> encrypted-on-disk device?
> 
> If so are you better of creating GELI devices (i.e. .eli) and running HAST on 
> those, or creating HAST devices - and running GELI on those?
> 
> Thanks,
> 
> -Karl
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