High speed data logging with Pharlap

[nanocyte]

Has anyone tried logging high speed with a pharlap target? My first instinct is to attach a USB SSD drive. Does Phalap support USB3 transfer speeds? The file format doesn't support large file sizes right? How much of a PITA is that?

[Lysandros]

What hardware are we talking about? Our PXI controller for example runs on Pharlap and it is indeed possible to log data deterministically.

[nanocyte]

Yes, PXIe 8821 RT. What sort of rates can I expect to a USB3 SSD? FYI, I don’t need determinism for this part of the application.

Is there a better option for throughput than a USB3 SSD?

[Lysandros]

That PXI controller should have also memory on its own. So you can conveniently save data on it while measuring, by writing data onto a text file for example. Now, if you require very large amounts of data, I suggest that you "pull" them periodically from the PXI or with some sort of a buffer over Ethernet / USB. But keep in mind, that your device  should have quite some memory available

[nanocyte]

Yes, I'd like to be able to store large records. Maybe up to 100GB. The reason I'm interested in USB3 speeds is I'm looking to transfer at a higher bandwidth than gigabit ethernet can provide. Does anyone have experience here?