linux-kernel - flashcache over md or lvm2?

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Message-ID: <CA+a=Yy7_5uSbGZYW=nrj-7q4pSM_t_VSG6fWKACpM1GJtKxcyQ@mail.gmail.com>
Date:	Sun, 9 Dec 2012 00:29:03 +0800
From:	Peng Tao <lkml.bergwolf@...il.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: flashcache over md or lvm2?

Hello,

I've seen some problems with flashcache and md/lvm2. When I create
RAID0 with either md or lvm2 and use it as a flashcache
(https://github.com/facebook/flashcache) writeback cache, I noticed
through blktrace that some bio only hit one SSD but not the other.
iostat also confirmed the situation. So I'm wondering if the setup is
even possible?

-- 
Thanks,
-Bergwolf
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