linux-kernel - Re: [RFC] [DONOTAPPLY] [PATCH] enhanceio: STEC EnhanceIO SSD caching software for Linux kernel

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Date:	Fri, 1 Feb 2013 17:23:00 -0800
From:	Kent Overstreet <koverstreet@...gle.com>
To:	Michel Lespinasse <walken@...gle.com>
Cc:	"Darrick J. Wong" <darrick.wong@...cle.com>,
	Amit Kale <akale@...c-inc.com>,
	linux-bcache <linux-bcache@...r.kernel.org>,
	device-mapper development <dm-devel@...hat.com>,
	Kent Overstreet <kent.overstreet@...il.com>,
	Mike Snitzer <snitzer@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, Jason Warr <jason@...r.net>,
	thornber@...hat.com
Subject: Re: [RFC] [DONOTAPPLY] [PATCH] enhanceio: STEC EnhanceIO SSD caching
 software for Linux kernel

On Fri, Feb 1, 2013 at 4:57 PM, Michel Lespinasse <walken@...gle.com> wrote:
> On Fri, Feb 1, 2013 at 4:44 PM, Darrick J. Wong <darrick.wong@...cle.com> wrote:
>> This is a patch to migrate STEC's enhanceio driver out of their github
>> repository and into the staging tree.  From their README:
>>
>> "EnhanceIO driver is based on EnhanceIO SSD caching software product developed
>> by STEC Inc. EnhanceIO was derived from Facebook's open source Flashcache
>> project. EnhanceIO uses SSDs as cache devices for traditional rotating hard
>> disk drives (referred to as source volumes throughout this document).
>> EnhanceIO can work with any block device, be it an entire physical disk, an
>> individual disk partition,  a RAIDed DAS device, a SAN volume, a device mapper
>> volume or a software RAID (md) device."
>
> What's your take on the benefits of this vs bcache ?

I've been trying to review it it for cache coherency and consistency
wrt. power failures, but the complete lack of high level documentation
is making that difficult.

I saw some benchmarks the other day where on writes EIO was faster
than the raw device, which was... suspicious.
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