Sorry, we no longer have these test drives :(
Paul -- Paul Emmerich Looking for help with your Ceph cluster? Contact us at https://croit.io croit GmbH Freseniusstr. 31h 81247 München www.croit.io Tel: +49 89 1896585 90 On Thu, Jan 16, 2020 at 1:48 PM <vita...@yourcmc.ru> wrote: > Hi, > > The results look strange to me... > > To begin with, it's strange that read and write performance differs. But > the thing is that a lot (if not most) large Seagate EXOS drives have > internal SSD cache (~8 GB of it). I suspect that new EXOS also does and > I'm not sure if Toshiba has it. It could explain the write performance > difference in your test. > > Try to disable Seagates' write cache with sdparm --set WCE=0 /dev/sdX > and see how the performance changes. If there is an SSD cache you'll > probably see an increase in iops. Due to the nature of Bluestore and at > least with an external block.db on SSD the difference is like ~230 iops > vs ~1200 iops with iodepth=1. This is the result for ST8000NM0055. > > Also it's strange that read performance is almost the same. Can you > benchmark the drive with fio alone, without Ceph? > > > Hi, > > > > we ran some benchmarks with a few samples of Seagate's new HDDs that > > some of you might find interesting: > > > > Blog post: > > > > https://croit.io/2020/01/06/2020-01-06-benchmark-mach2 > > > > GitHub repo with scripts and raw data: > > https://github.com/croit/benchmarks/tree/master/mach2-disks > > > > Tl;dr: way faster for writes, somewhat faster for reads in some > > scenarios > > > > Paul > > > > -- > > Paul Emmerich > > > > Looking for help with your Ceph cluster? Contact us at > > https://croit.io > > > > Looking for Ceph training? We have some free spots available > > https://croit.io/training/4-days-ceph-in-depth-training > > > > croit GmbH > > Freseniusstr. 31h > > 81247 München > > www.croit.io [1] > > Tel: +49 89 1896585 90 > > > > Links: > > ------ > > [1] http://www.croit.io > > _______________________________________________ > > ceph-users mailing list -- ceph-users@ceph.io > > To unsubscribe send an email to ceph-users-le...@ceph.io >
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