From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jason Warr <jason-/cow75dQlsI@public.gmane.org>
Subject: Re: bcache vs enhanceio?
Date: Tue, 19 Feb 2013 10:47:26 -0600
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>>> Also, if running in writethrough, why shouldn't an SSD be allowed to be added in realtime?
>> If you're running in writethrough, you'd already be caching... not sure
>> what you mean?

Perhaps he means being restricted to only being able to add a write-through cache without the superblock prep?  On a reboot or cache device fault event it would not cause any corruption, just performance impact back to where it was before the device was added.