Hi, I’m looking at 4TB Intel DC P4510 for data drives running BlueStore with WAL, DB and data on the same drives. Has anyone had any good / bad experiences with them? As Intel’s new data centre NVMe SSD it should be fast and reliable but then I would have thought the same about the DC S4600 drives which currently seem best to avoid… David > On 11 Jul 2018, at 11:57, Paul Emmerich <paul.emmerich@xxxxxxxx> wrote: > > 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 <rstanford8896@xxxxxxxxx>: > >> 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.emmerich@xxxxxxxx> 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 <wido@xxxxxxxx>: >> >> >> 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 _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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