MyDigitalSSD Boost, A High Performance External SSD

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derekullo

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So with sata3 devices capping at about 540 megabytes a second for the read from the high end samsung ssds, Samsung 850 Pro, and from what I'm reading usb3.1 also uses 8b/10b encoding like sata does, could we say a fully saturated hypothetical 12 gigabit link would be 540x2 or 1080 megabytes a second?

If that is true then to get a fully saturated 10 gigabit link we would go 1080 x 0.8 or 864 megabytes a second.

Would 864 megabytes a second be the upper limit for usb 3.1 ?



Edit: I'm blaming my calculator for those last 2 posts lol.
 

HERETIC-1

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Hi Chris,
As to "not being used as a boot drive"
You'd be surprised how many mac users with a dead HD,that don't want
to pay the apple tax and boot from a external SSD.

Is that flash 840ish or more 750ish? (not that there's probably much difference)
 

ttt_2017

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Total rubbish product ... where is the NVME PCIe to USB 3.1 Bridge chip ?

we dont need Raid , we have Blazing Fast NVME SSD already. we can Saturate the USB3.1 without the need of any Raid setup ...
 

derekullo

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The question is, is this indeed saturating 3.1 like the article says?

"We left our drive in RAID 0 to take advantage of the advanced Asmedia USB-to-SATA RAID controller and utilize the full 10Gbps bandwidth."

My math is showing they aren't, about 30 megabytes short of what 2 Samsung 850 Pros would do.

Although my math has been wrong before.

That's still respectable, but is 830 where the line is or is it 864.
 

Xajel

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This is the cheapest 1TB I knew, the thing is.. it's even cheaper than buying those individual 500GB Samsung mSATA from Amazon. I know the parts here are different than the retail ones in Amazon... but it's really a good deal. It's funny as I was thinking about buying two mSATA for my old laptop and desktop to speed them up and was thinking about two 500GB from samsung too, as of why mSATA.. as I'll get rid of these two systems after 1-2 years so I'll get those two mSATA's and I'll use one as external fast storage and the second as a second OS boot image for my main PC
 

CRamseyer

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If it published with "upper limit" then it's a writer to editor thing. My meaning was actually "upper limits" as in the upper limits of USB 3.1. Not the specific upper limit but the general, "this thing is fast", meaning.

With 10Gb/s Ethernet (10GbE) I get slightly over 1000 MB/s of real data transfer with large files.

ASMedia will not have a USB to PCIe bridge that supports NVMe for several months. It will increase the cost of both the drive and the bridge chip so be careful what you wish for. I know of at least one company that has displayed a prototype but it was more of a shell mock-up rather than a working product. I suspect we may see early USB 3.1 to NVMe designs at Computex in June but don't expect any meaningful availability until CES in January 2018.
 

derekullo

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Thanks for the response CRamseyer.

830 megabytes a second is plenty fast for most everyone for consumer use and probably for the majority of small business use.

An increase in speed of 30 gigabytes a second won't matter anyway even if i did end up replacing the drives with Samsung 850 pros.

I was just trying to confirm that my math was correct and that 863 MB/s was the limit for usb 3.1, although if 830 MB/s is the limit that is perfectly acceptable too.

I was actually thinking about something similar to this a few weeks ago of putting the zil for my nas4free server on a super fast usb device/enclosure using ssds.

All the posts saying don't use usb are for like usb 2.0 flash drives.


Super fast. Check
1 Terabyte capacity. Check
Replaceable drives allowing for configurable write endurance/speed
Doesn't use a valuable sata port. Check
(This is probably the biggest plus, lets me add another 8 terabyte drive)
(Storage Density FTW)

It almost sounds too good to be true.

I'm unsure what the write endurance for the 500 gigabyte drives they include are, but worst case I would buy 2 - Samsung 850 Pros.

I would of course test all of this on a temp first.


If all of this works as planned i may even try to use a device similar to this for actual storage for my nas4free.

The 255 limit of usb devices on a single hub came to mind almost instantly.

But that is a topic for a much later date.

Thanks again.
 

ttt_2017

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Intel USB3.1 controller can reach 20Gb/s per port (double Asmedia bandwidth) and currently only Gigabyte are releasing Motherboards with Intel USB 3.1 chipset.

we Can use NVME SSD on USB3.1 and get 2000MB/s sequential read/write if some one makes an NVME/USB3.1 Bridge.

More over , Companies are ignoring Thunderbolt 3 enclosures as well which can reach 4000MB/s

They will sell it overpriced I know but not because they are more expensive to make ,no because they target the 3D Rendering and movie editing companies.
 

derekullo

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Instead of a thuderbolt enclosure I would make a zfs server with an i7 and 128 gigabytes of ram and 8+ sata ports stuffed with ssds on 40Gb ethernet or 50Gb Infiniband(Soon).

Any reads from the device hopefully are pulled from the ARC (ram) which should allow you to cap out the 40Gb-50Gb connection or at least move the bottleneck to the user's computer.
No need for an L2ARC using all ssds.
I don't see a need for an ZIL since even if you were to use 8 ssds in a raid 10 even the write speed would be at least equal to the write speed of a Samsung 960 pro (about 2 gigabytes a second). Unless you needed an insane amount of write cache in which case you could use 2 Samsung Pro in a raid 0, which might be the case if you were recording at 8k or higher.

I mean that is what I would use if I were James Cameron instead of a thunderbolt enclosure.

If you think this looks impressive just imagine the backup system you would need to be able to handle the throughput for it lol.


If you haven't noticed.

I like zfs.
 

brucek2

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"My digital SSD"?!? Who is the target market for this, 6 year olds? Can I get a bundle with a "my digital mouse" and a "my digital mousepad"?
 

derekullo

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Old: Easy Bake Oven

New: Easy Raid Enclosure

 

CRamseyer

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You are more than welcome to come over to my place and set mine up if you like. I took it down for maintenance a few months ago and haven't had time to hook up the 40GbE and 56Gb IB setup. Some of my FreeNAS systems will suffer from the C2000 bug so I need to get them RMAed too.
 
1. I plop a storage device into a docking station and it does the backup in the background, usually completing in a matter of minutes while I'm doing other things ... sometimes that's sleeping. The biggest advantage I see to SSD for offsite storage is not the speed but the fact that it's mich lighter than a HD or SSHD and it fits in my shirt pocket.

2. Cables really ? Don't we have enough cables on our desks ? Can't we just get a SATA-E hot swap bay and rotate out multiple drives for off site storage and save the cost of an enclosure for every unit?
 
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