Messages in this thread |  | | Date | Fri, 1 Feb 2013 17:23:00 -0800 | Subject | Re: [RFC] [DONOTAPPLY] [PATCH] enhanceio: STEC EnhanceIO SSD caching software for Linux kernel | From | Kent Overstreet <> |
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On Fri, Feb 1, 2013 at 4:57 PM, Michel Lespinasse <walken@google.com> wrote: > On Fri, Feb 1, 2013 at 4:44 PM, Darrick J. Wong <darrick.wong@oracle.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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