DS1512+ USB 3.0

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powertowerpro
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DS1512+ USB 3.0

Unread post by powertowerpro » Wed Apr 04, 2012 2:40 am

Forgive the ignorant question, but this has me stumped:

What exactly are the USB 3.0 ports used for? Are they used to back up the DS1512+ system onto an external USB 3.0 device or the other way around or both?

I know this unit is first and foremost a NAS, but USB 3.0 is infinitely faster than gigabit, even with link aggregation. My understanding is that the DS1512+ can not be used as a DAS. Is that true and if so why not?

Thanks for entertaining my question. I am about to pull the trigger on the DS1511/12+ (the 12+ units seem to be dying left and right so just waiting to see what response Synology offers).

jrosado
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Re: DS1512+ USB 3.0

Unread post by jrosado » Wed Apr 04, 2012 11:31 pm

The USB ports on the synology are host ports. This means you can connect hard drives to them , to use them for backup, for example.

Regards.
Synology System
1 DS716+II / 1 Hitachi 4TB, 1 WD RED NAS 4TB

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Sorbe
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Re: DS1512+ USB 3.0

Unread post by Sorbe » Tue Apr 10, 2012 7:46 pm

I know this unit is first and foremost a NAS, but USB 3.0 is infinitely faster than gigabit, even with link aggregation.
While USB3.0 is theoretically able to send 5 Gigabits, actual implementations of Superspeed controllers are only getting 200+MB/second. That's about 1.6GBps -- and the designers have said that reaching 3 GBps would be "ideal".

The benchmark being that Gigabit Ethernet can hit 120MB/sec and dual GbE ports with LADP support on the switch can hit >200MB/sec.

In other words, the proven capability of USB3 is by no means "infinitely faster than gigabit". Currently, it's lucky to be AS FAST as dual GbE ports with link aggregation.

What this means is that you "might" be able to keep up with a dual GbE link using a USB3 attached external disk endpoint. The catches being that spinning media is always far, far worse bandwidth in random access mode than in sequential mode AND that the hw & sw implementation of USB3 has to be very very good.
Last edited by Sorbe on Sun Apr 15, 2012 11:20 am, edited 1 time in total.
DS713: 3.7TB= 2 Hitachi 4TB NAS Drives (HDN724040ALE640) SHR2
DS1812: 11TB = 8 Samsung/Seagate F4 2TB (HD204UI) SHR2
DS1813+DX513: 37TB = 12+1 Hitachi 4TB NAS Drives (HDN724040ALE640) SHR2

powertowerpro
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Re: DS1512+ USB 3.0

Unread post by powertowerpro » Tue Apr 10, 2012 7:55 pm

Thank you for the well thought out and clear email. You raise very salient points. I would only add that while Link Aggregation is great for an environment where multiple clients are accessing the data, only one client can ever get the ~120MB/sec provided by a gigabit line. So if USB 3.0 can provide ~200MB/sec it is still a win and given that the ports are already on the device, why not have it as an option?

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maxxfi
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Re: DS1512+ USB 3.0

Unread post by maxxfi » Sun Apr 15, 2012 7:31 am

First, as jrosado mentioned, the USB controllers should be changed, as they need to support USB OTG-mode i.e. both host and device mode. And so not only you'd need an excellent implementation of the USB stack, but also in bidirectional mode. This means higher costs, testing. etc.
Then, by making the Synology into a DAS, you're basically wasting the whole DSM: if the unit is connected in storage mode to a PC via USB, the host PC has to have exclusive access to the disk system, so all network/sharing/services from the DSM have to be disabled, and I'm not sure the average user for a 15 bays disk NAS (plus possible expansions) would like that.
No longer using Synology NAS, moved to more open source solutions.
DS-106j > DS-210j > DS-411

kewl1
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Re: DS1512+ USB 3.0

Unread post by kewl1 » Sat Feb 24, 2018 2:21 am

I use my NAS to back up huge high def movie files from my desktop. The speed is very slow using the CAt 5 or 6 cable. So I just bought a USB3 cable for this purpose but with it, the computer does not see the NAS using either USB 3 or USB 2. What am I doing wrong?

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rgarjr
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Re: DS1512+ USB 3.0

Unread post by rgarjr » Sat Feb 24, 2018 6:15 am

kewl1 wrote:I use my NAS to back up huge high def movie files from my desktop. The speed is very slow using the CAt 5 or 6 cable. So I just bought a USB3 cable for this purpose but with it, the computer does not see the NAS using either USB 3 or USB 2. What am I doing wrong?
Impossible to connect the 2 with USB.
DS509+ | 1 x 1TB
DS918+ | 16GB RAM | 2 x 850 EVO 500GB
DS1812+ | 3GB RAM
DS1815+ | 6GB RAM
DS1817+
DS2413+ | 4GB RAM | 12 x 3TB WD (Backup Box)
DS3617XS | 48GB RAM | 11 x 8TB WD | 1 x 850 EVO 250GB (Main Box)

kewl1
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Re: DS1512+ USB 3.0

Unread post by kewl1 » Mon Feb 26, 2018 6:31 am

OK, thanks. I was afraid of that. I assume that USB ports are just to back up the NAS and to connect the NAS to other USB drives?

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