There is http://www.sebastien-han.fr/blog/2014/10/10/ceph-how-to-test-if-your-ssd-is-suitable-as-a-journal-device/
On the other hand, I'm not sure if SSD vendors would be happy to see their device listed performing total crap (for Journaling) ...but yes, I vote for having some oficial page if possible ! On 7 September 2015 at 11:12, Eino Tuominen <[email protected]> wrote: > Hello, > > Should we (somebody, please?) gather up a comprehensive list of suitable > SSD devices to use as ceph journals? This seems to be a FAQ, and it would > be nice if all the knowledge and user experiences from several different > threads could be referenced easily in the future. I took a look at > wiki.ceph.org and there was nothing on this. > > -- > Eino Tuominen > > -----Original Message----- > From: ceph-users [mailto:[email protected]] On Behalf Of > Jan Schermer > Sent: 7. syyskuuta 2015 11:44 > To: Christian Balzer > Cc: ceph-users; Межов Игорь Александрович > Subject: Re: [ceph-users] which SSD / experiences with Samsung 843T vs. > Intel s3700 > > Re: Samsungs - I feel some of you are mixing and confusing different > Samsung drives. > > There is a DC line of Samsung drives meant for DataCenter use. Those have > EVO (write once read many) and PRO (write mostly) variants. > You don't want to go anywhere near the EVO line with Ceph. > Then there are "regular" EVO and PRO drives - they are not meant for > server use so don't use them. > > The main difference is that the "DC" line should provide reliable and > stable performance over time, no surprises, while the desktop drives can > just pause and perform garbage collection and have completely different > cache setup. If you torture desktop drive hard enough it will protect > itself (slow down to a crawl). > > So the only usable drivess for us are "DC PRO" and nothing else. > > Jan > > > On 05 Sep 2015, at 04:36, Christian Balzer <[email protected]> wrote: > > > > > > Hello, > > > > On Fri, 4 Sep 2015 22:37:06 +0000 Межов Игорь Александрович wrote: > > > >> Hi! > >> > >> > >> Have worked with Intel DC S3700 200Gb. Due to budget restrictions, one > >> > >> ssd hosts a system volume and 1:12 OSD journals. 6 nodes, 120Tb raw > >> space. > >> > > Meaning you're limited to 360MB/s writes per node at best. > > But yes, I do understand budget constraints. ^o^ > > > >> Cluster serves as RBD storage for ~100VM. > >> > >> > >> Not a single failure per year - all devices are healthy. > >> > >> The remainig resource (by smart) is ~92%. > >> > > I use 1:2 or 1:3 journals and haven't made any dent into my 200GB S3700 > > yet. > > > >> > >> Now we're try to use DC S3710 for journals. > > > > As I wrote a few days ago, unless you go for the 400GB version the the > > 200GB S3710 is actually slower (for journal purposes) than the 3700, as > > sequential write speed is the key factor here. > > > > Christian > > -- > > Christian Balzer Network/Systems Engineer > > [email protected] Global OnLine Japan/Fusion Communications > > http://www.gol.com/ > > _______________________________________________ > > ceph-users mailing list > > [email protected] > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- Andrija Panić
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