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

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Date:	Sat, 2 Feb 2013 09:39:00 +0800
From:	Amit Kale <akale@...c-inc.com>
To:	Kent Overstreet <koverstreet@...gle.com>,
	Michel Lespinasse <walken@...gle.com>
CC:	"Darrick J. Wong" <darrick.wong@...cle.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" <thornber@...hat.com>
Subject: RE: [RFC] [DONOTAPPLY] [PATCH] enhanceio: STEC EnhanceIO SSD
 caching software for Linux kernel

End user documentation is on our github. I think it should go with the user level utilities, rather than the kernel driver.
-Amit

> -----Original Message-----
> From: Kent Overstreet [mailto:koverstreet@...gle.com]
> Sent: Friday, February 01, 2013 5:25 PM
> To: Michel Lespinasse
> Cc: Darrick J. Wong; Amit Kale; linux-bcache; device-mapper
> development; Kent Overstreet; Mike Snitzer; LKML; Jason Warr;
> thornber@...hat.com
> Subject: Re: [RFC] [DONOTAPPLY] [PATCH] enhanceio: STEC EnhanceIO SSD
> caching software for Linux kernel
> 
> Also, where's the end user documentation?
> 
> On Fri, Feb 1, 2013 at 5:23 PM, Kent Overstreet
> <koverstreet@...gle.com> wrote:
> > 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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