On Fri, Feb 1, 2013 at 4:57 PM, Michel Lespinasse <walken@xxxxxxxxxx> wrote: > On Fri, Feb 1, 2013 at 4:44 PM, Darrick J. Wong <darrick.wong@xxxxxxxxxx> 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. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
