Hi, we‘ve no long-term data for the SM variant. Performance is fine as far as we can tell, but the main difference between these two models should be endurance.
Also, I forgot to mention that my experiences are only for the 1, 2, and 4 TB variants. Smaller SSDs are often proportionally slower (especially below 500GB). Paul > Robert Stanford <rstanford8...@gmail.com>: > > Paul - > > That's extremely helpful, thanks. I do have another cluster that uses > Samsung SM863a just for journal (spinning disks for data). Do you happen to > have an opinion on those as well? > >> On Wed, Jul 11, 2018 at 4:03 AM, Paul Emmerich <paul.emmer...@croit.io> >> wrote: >> PM/SM863a are usually great disks and should be the default go-to option, >> they outperform >> even the more expensive PM1633 in our experience. >> (But that really doesn't matter if it's for the full OSD and not as >> dedicated WAL/journal) >> >> We got a cluster with a few hundred SanDisk Ultra II (discontinued, i >> believe) that was built on a budget. >> Not the best disk but great value. They have been running since ~3 years now >> with very few failures and >> okayish overall performance. >> >> We also got a few clusters with a few hundred SanDisk Extreme Pro, but we >> are not yet sure about their >> long-time durability as they are only ~9 months old (average of ~1000 write >> IOPS on each disk over that time). >> Some of them report only 50-60% lifetime left. >> >> For NVMe, the Intel NVMe 750 is still a great disk >> >> Be carefuly to get these exact models. Seemingly similar disks might be just >> completely bad, for >> example, the Samsung PM961 is just unusable for Ceph in our experience. >> >> Paul >> >> 2018-07-11 10:14 GMT+02:00 Wido den Hollander <w...@42on.com>: >>> >>> >>> On 07/11/2018 10:10 AM, Robert Stanford wrote: >>> > >>> > In a recent thread the Samsung SM863a was recommended as a journal >>> > SSD. Are there any recommendations for data SSDs, for people who want >>> > to use just SSDs in a new Ceph cluster? >>> > >>> >>> Depends on what you are looking for, SATA, SAS3 or NVMe? >>> >>> I have very good experiences with these drives running with BlueStore in >>> them in SuperMicro machines: >>> >>> - SATA: Samsung PM863a >>> - SATA: Intel S4500 >>> - SAS: Samsung PM1633 >>> - NVMe: Samsung PM963 >>> >>> Running WAL+DB+DATA with BlueStore on the same drives. >>> >>> Wido >>> >>> > Thank you >>> > >>> > >>> > _______________________________________________ >>> > 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 >> >> >> >> -- >> 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 >
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