Re: Samsung pm863 / sm863 SSD info request

[Дробышевский, Владимир <vlad@xxxxxxxxxx>]

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 Drobyshevskiy

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Дробышевский Владимир                                     
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2015-08-25 18:35 GMT+05:00 Jan Schermer <jan@xxxxxxxxxxx>:

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 least in my cluster it would die a horrible death...

Keep in mind that when you start approaching the cell lifetime you will get a lot more CRC errors, lot more corrupted (undetectable!) sectors and some of the errors can go undetected until another drive fails (which is when you read the most).

And do you really want to change all the drives yearly?

I don't think this SSD is suitable for any server for storage, maybe for OS or some read-intensive tasks...

Jan

On 25 Aug 2015, at 15:26, Дробышевский, Владимир <vlad@xxxxxxxxxx> wrote:

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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