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SubjectRe: [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 <> wrote:
> On Fri, Feb 1, 2013 at 4:57 PM, Michel Lespinasse <> wrote:
>> On Fri, Feb 1, 2013 at 4:44 PM, Darrick J. Wong <> 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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