> On 30 Sep 2014, at 16:38, Mark Nelson <mark.nel...@inktank.com> wrote: > > On 09/29/2014 03:58 AM, Dan Van Der Ster wrote: >> Hi Emmanuel, >> This is interesting, because we’ve had sales guys telling us that those >> Samsung drives are definitely the best for a Ceph journal O_o ! > > Our sales guys or Samsung sales guys? :) If it was ours, let me know.
Haha, neither. Cheers, Dan > >> The conventional wisdom has been to use the Intel DC S3700 because of its >> massive durability. > > The S3700 is definitely one of the better drives on the market for Ceph > journals. Some of the higher end PCIE SSDs have pretty high durability (and > performance) as well, but cost more (though you can save SAS bay space, so > it's a trade-off). > >> >> Anyway, I’m curious what do the SMART counters say on your SSDs?… are they >> really failing due to worn out P/E cycles or is it something else? >> >> Cheers, Dan >> >> >>> On 29 Sep 2014, at 10:31, Emmanuel Lacour <elac...@easter-eggs.com> wrote: >>> >>> >>> Dear ceph users, >>> >>> >>> we are managing ceph clusters since 1 year now. Our setup is typically >>> made of Supermicro servers with OSD sata drives and journal on SSD. >>> >>> Those SSD are all failing one after the other after one year :( >>> >>> We used Samsung 850 pro (120Go) with two setup (small nodes with 2 ssd, >>> 2 HD in 1U): >>> >>> 1) raid 1 :( (bad idea, each SSD support all the OSDs journals writes :() >>> 2) raid 1 for OS (nearly no writes) and dedicated partition for journals >>> (one per OSD) >>> >>> >>> I'm convinced that the second setup is better and we migrate old setup >>> to this one. >>> >>> Thought, statistics gives 60GB (option 2) to 100 GB (option 1) writes per >>> day on SSD on a not >>> really over loaded cluster. Samsung claims to give 5 years warranty if >>> under 40GB/day. Those numbers seems very low to me. >>> >>> What are your experiences on this? What write volumes do you encounter, >>> on wich SSD models, which setup and what MTBF? >>> >>> >>> -- >>> Easter-eggs Spécialiste GNU/Linux >>> 44-46 rue de l'Ouest - 75014 Paris - France - Métro Gaité >>> Phone: +33 (0) 1 43 35 00 37 - Fax: +33 (0) 1 43 35 00 76 >>> mailto:elac...@easter-eggs.com - http://www.easter-eggs.com >>> _______________________________________________ >>> ceph-users mailing list >>> ceph-users@lists.ceph.com >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
