Alexander,
Samsung says that pm863 uses Samsung's "proprietary" 3-bit MLC V-NAND, and sm863 - 2-bit MLC V-NAND. But from endurance perspective these drives don't look as worth their money (except of some read-mostly cases).
С уважением,
Дробышевский Владимир
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2015-08-25 18:35 GMT+05:00 Alexandre DERUMIER <aderumier@xxxxxxxxx>:
Hi,
If it was me, I'll just waiting a little to see real endurance of theses samsung drives,
because AFAIK, they use TLC memory (and I remember of all theses EVO drives TLC memory bugs)
But it seem that Dell use them is these new full flash array,
http://www.tomsitpro.com/articles/dell-ssd-3d-tlc-afa,1-2754.html,
so maybe they are quite ok.
----- Mail original -----
De: "aderumier" <aderumier@xxxxxxxxx>
À: "Дробышевский, Владимир" <vlad@xxxxxxxxxx>
Cc: "Jan Schermer" <jan@xxxxxxxxxxx>, "ceph-users" <ceph-users@xxxxxxxx>
Envoyé: Mardi 25 Août 2015 15:33:37
Objet: Re: Samsung pm863 / sm863 SSD info request
Alexandre Derumier
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----- Mail original -----
De: "Дробышевский, Владимир" <vlad@xxxxxxxxxx>
À: "Jan Schermer" <jan@xxxxxxxxxxx>
Cc: "ceph-users" <ceph-users@xxxxxxxx>
Envoyé: Mardi 25 Août 2015 15:26:02
Objet: Re: 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 drive bay ratio.
For sm863 1.84TB it's even better: $0.057 per TB written. Actually, it's better than for Intel S3710 1.2TB: $0.081 per TB written for Intel. But s3710 has better speed specs of course (the only problem that we have not enough CPU speed for such IOPS, I think).
I found Intel prices on http://google.com/shopping (the lowest ones) and the only one price I was able to find for Samsung - through "Where to Buy" on the Samsung website.
For Intel prices were:
s3610 1.6TB - $1530 ($0.96 per GB of capacity)
s3710 1.2TB - $1780 ($1.49 per GB)
For Samsung:
pm863 3.84TB - $2328 ($0.61 per GB)
sm863 1.92TB - $1324 ($0.69 per GB)
As far as I know these are retail products (they are listed on Samsung Business SSD section) but they aren't avaliable in my country and Support said nothing about timescales.
But I belive these SSDs will be avaliable in Europe and USA soon so I consider them as an alternative to Intel drives for the new cluster I'm working on. The only question is real speed.
Best regards,
Vladimir Drobyshevskiy
2015-08-25 16:56 GMT+05:00 Jan Schermer < jan@xxxxxxxxxxx > :
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 < vlad@xxxxxxxxxx > wrote:
>
> 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 100, warranty: 5 years and 12320 TBW, suggested retail price $1260 (1.92TB model)
>
> pm863: up to 3.84GB, 540 / 480 mb/s sequential read / write, 99k / 18k random IOPS, cas latency 170, warranty: 3 years and 5600 TBW, suggested retail price $2200 (3.84TB model)
>
> So I would like to ask: has anybody got it yet and did any tests (ceph tests preferably)?
>
> Thanks!
>
> Best regards,
> Vladimir Drobyshevskiy
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