Hi Blario, Thanks for the feedback. > On Nov 3, 2015, at 9:27 PM, Blair Bethwaite <blair.bethwaite@xxxxxxxxx> wrote: > > Hi Douglas, > > It's not clear whether you used SSD journals for the OSDs in the base > config (or in the backing pool for the tiered tests) - it looks like > not? Correct, these tests used spinning disk journals; the test cluster isn’t equipped with SSDs. It may be interesting to know how using NVMe devices for journaling as opposed to a cache tier performs. I’ll run the numbers. > If that's the case then I don't think this provides the most > interesting point of comparison, because the tests are write-latency > sensitive you'd naturally expect SSD journals to make a lot of > difference and would surely start with those in the base config. I'm > interested in how a similar setup would perform compared to regular > journaling and Ceph tiering all on the server-side, e.g., dm-cache (or > bcache) based OSDs - apparently a bunch of people do this in the wild > with success, but AFAIK there has never been any detailed benchmarking > published. I haven’t heard of this type of configuration myself, but it might be a possible scenario to explore. Thanks again, —Doug > > Cheers, > > On 3 November 2015 at 05:09, Douglas Fuller <dfuller@xxxxxxxxxx> wrote: >> I’ve published a whitepaper detailing configuration and benchmark results using SysBench MySQL on top of RBD with dm-cache. Results using a Ceph cache tier are also included. Questions, comments, criticism, nitpicking, and/or discussion are welcome. >> >> http://tracker.ceph.com/projects/ceph/wiki/Ceph_and_dm-cache_for_Database_Workloads >> >> —Doug-- >> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > -- > Cheers, > ~Blairo > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
