SSD stream oscilloscope? - Page 1
Forum section: electronics / general

author: vlad777
author_rank: Frequent Contributor
timestamp: December 23, 2015, 05:19:58 pm
content: How about connecting high speed ADC directly to PCIexpress solid state drive (1GB write speed) ?You could stream 250MHz signal to storage for few hours.Do you think we will be seeing something like that in the near future?Like a feature on regular scopes?

author: ataradov
author_rank: Super Contributor
timestamp: December 23, 2015, 05:43:30 pm
content: I believe, I've seen something like that. The use case is not really clear, it will be a specialty device.What are you going to do with gigabytes worth of sampled data?Also, DDR4 prices recently went down a lot and it will probably be easier to use.

author: vlad777
author_rank: Frequent Contributor
timestamp: December 23, 2015, 06:05:10 pm
content: Data mining of phase array pointed to the stars... (just kidding).Edit:Of course with streaming you get "infinite update rate".PCIe is designed to plug and unplug many times, and ddr4 isn't,so you plug it to scope and then go on PC to analyze the record.

author: ataradov
author_rank: Super Contributor
timestamp: December 23, 2015, 06:09:05 pm
content: And there are things like that designed for specialty applications like this. LHC has pretty incredible data acquisition architecture and they store some huge amounts of data (eventually it all ends up on tape, of course).

author: vlad777
author_rank: Frequent Contributor
timestamp: December 23, 2015, 06:20:29 pm
content: Quote from: ataradov on December 23, 2015, 06:09:05 pmDo you have a link to a video or article, I want to see what kind of tape and tape-machine they use?

author: vlad777
author_rank: Frequent Contributor
timestamp: December 23, 2015, 06:27:08 pm
content: Quote from: blueskull on December 23, 2015, 06:15:14 pmI didn't know about GPIF ,looks good, thanks.

author: ataradov
author_rank: Super Contributor
timestamp: December 23, 2015, 06:28:20 pm
content: Quote from: vlad777 on December 23, 2015, 06:20:29 pmJust google it. I don't think there is a definitive video or article, there has been small amounts of information leaking over time.http://arstechnica.com/science/2010/08/lhc-computing-grid-pushes-petabytes-of-data-beats-expectations/http://www.economist.com/news/technology-quarterly/21590758-information-storage-60-year-old-technology-offers-solution-modernAnd there is some stuff on the CERN and LHC sites.Edit: But they use some off the shelf solution with fully automated archive. If you want to access the data, some robot fetches the tape and puts it into the reader.

author: vlad777
author_rank: Frequent Contributor
timestamp: December 23, 2015, 06:32:23 pm
content: Quote from: ataradov on December 23, 2015, 06:28:20 pmIt is interesting how, when you go up in demand, it forces us back to basic concepts. (like C array vs javascript)

author: ataradov
author_rank: Super Contributor
timestamp: December 23, 2015, 07:01:09 pm
content: Quote from: vlad777 on December 23, 2015, 06:32:23 pmI've seen some video, where they have described how they process all this data. Basically it is all low level C++ written mostly from scratch and with occasional use of well known and debugged libraries like LAPACK (Fortran for the win). Most of that is written by graduate students.

author: dexters_lab
author_rank: Unknown
timestamp: December 23, 2015, 08:10:17 pm
content: Quote from: vlad777 on December 23, 2015, 06:20:29 pmHave been in the data centre in 2013, they have several massive tape libraries, the newest ones seem to be IBM TS3500 as you can see in these picsi think the bigger of the two in the second pic was due to be comissioned, with another going in alongside it, you can see the grey patch marked out for it on the far right

author: continuo
author_rank: Frequent Contributor
timestamp: December 23, 2015, 08:37:13 pm
content: Computerphile did a short vid on it: