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Re: [newtech-1] SSD based NAS solution

From: Chris F.
Sent on: Thursday, November 8, 2012 7:43 AM
Paul, what type of SSDs were you using?

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On Nov 8, 2012, at 2:07 AM, paul <[address removed]> wrote:

I had multiple failures last year of SSDs. When they failed they did not show as active drives to several computers I plugged the SATA into. Maybe it could have been possible (though expensive) to get to extract data from them we didn't need to because they were part of a RAID set. So we just sent them back to the manufacturer for warranty replacement.

SSDs come in multiple types some being more likely to fail than others. If you put SSD into a RAID system drives are likely to fail at the same time because their failure modes occurs due to how many times the memory cells in them are written to. For this reason RAID with SSDs can actually be a disaster unless you mix drive capacity and don't use the extra space of the larger drive in a mixed set.

Doesn't he have off-site backups? What if his office burned down or lightning struck?
 
Paul Yurt
Inventor / Systems Engineer / Media Technologist
[address removed]
310~[masked]


From: Baba <[address removed]>
To: [address removed]
Sent: Wednesday, November 7,[masked]:56 PM
Subject: Re: [newtech-1] SSD based NAS solution

His Drobo units are a year or more old, whoever installed them for him chose to use it as the place where his library of images resides. I believe it is USB 2.0.
I have don't think speed is of importance to him in that he has scanned or has someone scan his slides and place them in an Aperture library. He does little in terms of photo editing on photoshop. 
For the last 8-9 years he has been using digital cameras for his work. When he travels he dumps his images onto his laptop and then when he gets back to Brooklyn he connects to the Drobo and dumps them there.
He is 70 and he wants to make sure these images are still around way after he is gone. Smithsonian had recently sent him a 1TB disk drive for him to give them a bunch of his images that they are working on an exhibit for in China. He wants to just make sure that whatever he is doing is appropriate and so far he has a local backup system (Timecapsule), a crashplan setup and the Drobo boxes. He has had to replace the drive in the Timecapsule he mentioned so that's where his concern arose and I don't wish to mislead him by suggesting him to spend $2k or so and he finds it is not worth it in the end.
So far SSD's for a NAS from what I am reading here is that it is not money spent well.
Right now a 480GB SSD is $340, so a 2TB system would be like $1700 plus a NAS unit like Synology would be $400. 




On Wed, Nov 7, 2012 at 7:24 PM, paul <[address removed]> wrote:
Thunderbolt, USB3 and FireWire 600 are all fast enough keep up with spinning disk I/O.
USB2 and original FireWire are not fast enough and become bottlenecks.
 
Paul Yurt
Inventor / Systems Engineer / Media Technologist
[address removed]
310~[masked]


From: Jonathan Hirschman <[address removed]>
To: [address removed]
Sent: Wednesday, November 7,[masked]:09 PM

Subject: Re: [newtech-1] SSD based NAS solution

On 11/7/2012 5:40 PM, Ahmad Alk wrote:
>  From a general perspective, is there any issues with using SSD NAS, maybe using thunderbolt technology?
> Just for general purpose storage. Anyone had issues with it?
>
> Thanks,
> Ahmad
>
>

To be completely accurate, something attached via USB or Thunderbolt isn't a NAS at all - it's a locally attached storage array.

I assumed that the Drobo was using USB 2.0. If it's using 3.0, it might be OK. I don't really know much about USB 3.0.

But to answer your question - Thunderbolt is pretty quick. It runs at 10Gb/s per device - so over 1 gigaBYTE/sec, which is probably beyond the speed of most arrays (or host computers).

jh




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