Re: [ceph-users] Samsung pm863 / sm863 SSD info request

Maybe if you TRIM it first, but the correct way to do that is like this: https://www.thomas-krenn.com/en/wiki/SSD_Over-provisioning_using_hdparm Jan > On 26 Aug 2015, at 18:58, Emmanuel Florac wrote: > > Le Tue, 25 Aug 2015 17:07:18 +0200 > Jan Schermer écrivait: > >> There's a nice whitepa

Re: [ceph-users] Samsung pm863 / sm863 SSD info request

Le Tue, 25 Aug 2015 17:07:18 +0200 Jan Schermer écrivait: > There's a nice whitepaper about under-provisioning > everyone using SSDs should read it > > http://www.sandisk.com/assets/docs/WP004_OverProvisioning_WhyHow_FINAL.pdf >

Re: [ceph-users] Samsung pm863 / sm863 SSD info request

On 25/08/2015 17:07, Jan Schermer wrote: There's a nice whitepaper about under-provisioning everyone using SSDs should read it http://www.sandisk.com/assets/docs/WP004_OverProvisioning_WhyHow_FINAL.pdf True. That is by far one of the best paper on this topic. The example given in chapter 5 is

Re: [ceph-users] Samsung pm863 / sm863 SSD info request

"aderumier" mailto:aderum...@odiso.com>> > À: "Дробышевский, Владимир" mailto:v...@itgorod.ru>> > Cc: "Jan Schermer" mailto:j...@schermer.cz>>, "ceph-users" > mailto:ceph-us...@ceph.com>> > Envoyé: Mardi

Re: [ceph-users] Samsung pm863 / sm863 SSD info request

they are quite ok. > > > > - Mail original - > De: "aderumier" > À: "Дробышевский, Владимир" > Cc: "Jan Schermer" , "ceph-users" > Envoyé: Mardi 25 Août 2015 15:33:37 > Objet: Re: [ceph-users] Samsung pm863 / sm863 SSD

Re: [ceph-users] Samsung pm863 / sm863 SSD info request

Hi - On 25/08/2015 15:42, Alexandre DERUMIER wrote: PM863 3.84 TB is available in France, public website: http://www.ldlc.com/fiche/PB00193402.html Not really. I didn't find any item available in stock yet, that is just pre-orders. As far as I know, it is quite easy to make manual over-p

Re: [ceph-users] Samsung pm863 / sm863 SSD info request

Jan, sorry, I misundestood "TBW" definition. It's still a little bit better (1.33 DWPD) than 0.8 DWPD but much worse than I thought. So it means $0.41 per TB written for pm863 and $0.105 per TB written for sm863 which is just terrible in comparison with Intel drives. Best regards, Vladimir Drob

Re: [ceph-users] Samsung pm863 / sm863 SSD info request

BTW, PM863 3.84 TB is available in France, public website: http://www.ldlc.com/fiche/PB00193402.html - Mail original - De: "aderumier" À: "Дробышевский, Владимир" Cc: "ceph-users" Envoyé: Mardi 25 Août 2015 15:35:57 Objet: Re: [ceph-users] Samsung pm86

Re: [ceph-users] Samsung pm863 / sm863 SSD info request

sd-3d-tlc-afa,1-2754.html, so maybe they are quite ok. - Mail original - De: "aderumier" À: "Дробышевский, Владимир" Cc: "Jan Schermer" , "ceph-users" Envoyé: Mardi 25 Août 2015 15:33:37 Objet: Re: [ceph-users] Samsung pm863 / sm863 SSD info requ

Re: [ceph-users] Samsung pm863 / sm863 SSD info request

I can't really comment on price, I haven't found them anywhere maybe because they are pretty fresh but I think I read they are oem-only to sell in complete systems. That doesn't mean they can't be bought of course. I was commenting on DWPD of PM863 - at 0.8 DWPD that's pretty terrible and at le

Re: [ceph-users] Samsung pm863 / sm863 SSD info request

: "Дробышевский, Владимир" À: "Jan Schermer" Cc: "ceph-users" Envoyé: Mardi 25 Août 2015 15:26:02 Objet: Re: [ceph-users] Samsung pm863 / sm863 SSD info request Jan, thanks for the opinion! Do you think that 5.11 DWPD is terrible? For example, Intel S3610 has 3 DWPD or

Re: [ceph-users] Samsung pm863 / sm863 SSD info request

Jan, thanks for the opinion! Do you think that 5.11 DWPD is terrible? For example, Intel S3610 has 3 DWPD or 5475 TBW (but for 5 years, of course). For 1.6TB Intel S3610 it means ~$0.175 per TB written. For pm863 3.84TB the price per TB written will be ~$0.108. And more than twice capacity per dri

Re: [ceph-users] Samsung pm863 / sm863 SSD info request

pm863 has terrible DWPD, I wouldn't even consider it. sm863 is better and could be worthwile But I think both of these are OEM-only. Or can you buy them in bulk somewhere? Jan > On 25 Aug 2015, at 12:18, Дробышевский, Владимир wrote: > > Hello! > > For a few months I'm looking for any news

[ceph-users] Samsung pm863 / sm863 SSD info request

Hello! For a few months I'm looking for any news about new VNAND Samsung sm863 \ pm863 SSDs. A couple of weeks ago it's finally appeared on the Samsung web-site. Final specs look very interesting: sm863: up to 1.92GB, 520 / 485 mb/s sequential read / write, 97k / 29k random IOPS, cas latency 10