Thanks for the information. It is very useful when the latency is important. How about in my use case? It's read intensive, %90 data is cokie. It's coming from windows disk usage, PageFile is disabled. After Bootstorm I only see 5-10K I/O max. I really do not need that much I/O power. Also I'm thinking to put VM images in a REPx3 pool, and take their clone to REPx2 pool. Everymonth or Week we have to delete all these VM's and recreate them. Maybe I should use PLP disks for REPx3 Image pool and leave the rest 870evo. It makes sense. Thanks. Alexander E. Patrakov <patrakov@xxxxxxxxx>, 6 Haz 2021 Paz, 09:03 tarihinde şunu yazdı: > > пт, 4 июн. 2021 г. в 15:58, mhnx <morphinwithyou@xxxxxxxxx>: > > > > I wonder that when a osd came back from power-lost, all the data > > scrubbing and there are 2 other copies. > > PLP is important on mostly Block Storage, Ceph should easily recover > > from that situation. > > That's why I don't understand why I should pay more for PLP and other > > protections. > > > > In my use case %90 of the data is cookie %10 is coldish metadata and I > > don't wanna pay more features I don't need. That's it. > > Using 870evo's with Nvme WAL is a good idea but In this case the Price > > still goes up cause I'm using 2 osd per device. 60 osd Total across > > 21Host. > > > > Samsung PM883 is good. We're using them for different projects. It is > > at the top of the list. > > These are all TLC nands and I think lowest price in the market. Its > > better to have MLC but the price goes double. > > > > Samsung PM883 480GB SATA 6Gb/s V4 TLC 2.5" 7mm (1.3 DWPD) 1 $102,48 > > Micron 5300 PRO 480GB, SATA, 2.5", 3D TLC, 1.5DWPD 1 $110,54 > > Micron 5300 MAX 480GB, SATA, 2.5", 3D TLC, 5DWPD 1 $132,41 > > Intel D3-S4610 480GB SATA 6Gb/s 3D TLC 2.5" 7mm 3DWPD Rev.2 1 $131,26 > > > > > > Samsung 860 PRO SATA 2.5" SSD 512GB V-NAND 2bit MLC 600 TBW. > > 860PRO is MLC, that's good but TBW is half of the PM883 and no PLP. > > > > I think I'm going with the PM883 if there is no other advice from the community. > > > > mj <lists@xxxxxxxxxxxxx>, 4 Haz 2021 Cum, 12:24 tarihinde şunu yazdı: > > > > > > Hi, > > > > > > On 5/30/21 8:45 PM, mhnx wrote: > > > > Hello Samuel. Thanks for the answer. > > > > > > > > Yes the Intel S4510 series is a good choice but it's expensive. > > > > I have 21 server and data distribution is quite well. > > > > At power loss I don't think I'll lose data. All the VM's using same > > > > image and the rest is cookie. > > > > In this case I'm not sure I should spend extra money on PLP. > > > > > > > > Actually I like Samsung 870 EVO. It's cheap and I think 300TBW will be > > > > enough for 5-10years. > > > > Do you know any better ssd with the same price range as 870 EVO? > > > > > > > > Samsung 870 evo (500GB) = 5 Years or 300 TBW - $64.99 > > > > Samsung 860 pro (512GB) = 5 Years or 600 TBW - $99 > > > > > > > > > > But do these not lack power-loss protection..? > > > > > > We are running the Samsung PM883, as I was told that these would do much > > > better as OSDs. > > > > > > MJ > > With Ceph, power loss protection is important not because it protects > the data after power loss, but because it allows the drive not to > waste time on fsyncs (which Ceph issues for every write). I.e. better > performance. > > -- > Alexander E. Patrakov > CV: http://u.pc.cd/wT8otalK _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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