PXI RT Controller Shows 0% Hard Drive

[Nick Stevens]

I have a PXI RT controller that has recently started to report 0% hard drive free through the LabVIEW disk space VIs and through MAX. However, if I FTP into the system I can copy many megabytes of information to the hard drive without issue. Tests are running fine and saving to the hard drive as well. It seems that only the tools that report on remaining HD space are confused.

Is this an issue that anyone has seen before? I will probably reformat the drive and reinstall the RTOS to see if that gets rid of it, but before I do that I wanted to find out if I've stumbled on a bug that it would be useful to study in more detail.

[Sanjay_C.]

Hi Nick,

I have not been able to find any documentation on such an error. It's possible that this is a bug. Can you please provide me with some more information? Specifically:

1. A screenshot of the 0% Hard Drive free report in MAX (Measurement and Automation Explorer)

2. Your operating system

3. The version of LV/LVRT in use

4. The version of MAX in use

5. The PXI RT controller in use

I can try to replicate the issue on my end, and I can file the issue with R&D if I'm able to replicate it on my end. If there's any other information that I would need in order to replicate this on my end, please provide that as well. It's also possible that something might be corrupt with either the driver or the RTOS which is causing this issue. The behavior you are witnessing is indeed quite strange.

[Nick Stevens]

Hi Sanjay,

Glad that I'm not losing my marbles (well no guarantee of that I guess...)

The system in question is at a customer site, so it may be a few days before I can get back to collect the information. But I will post as soon as I have it.

Thanks!

[Sanjay_C.]

Hi Nick,

Thanks for taking the time to go through the trouble in getting the above information -- this will help us try to replicate the issue on our end. Have you subsequently reformatted the disk and/or overcome the issue? Worst case, even if we can't replicate the issue, we will be able to provide a workaround.

[zou]

Is this problem solved?

I'm having the same problem.

NI 3110.  LabVIEW  Real-Time 11.0

MAX indicates 0 free disk space.

[Texas_Diaz]

MAX may indicate 0 bytes free on the disk (and also 0 bytes free RAM) if there's a momentary problem communicating with the target.  

If you write a quick VI for the RT system, and run the "Get Volume Info.vi" using the path "c:\", what is returned for "free (bytes)"?

-Danny

[zou]

It's always 0 on MAX.  Not momentary.

And the "Get Volume Info.vi" using the path "c:\",  also return 0.

[Texas_Diaz]

Ah, one more question - is your disk formatted with a FAT or Reliance filesystem?  You can tell when the controller boots, on the screen if you see any messages mentioning Datalight or Reliance then it's formatted Reliance.  Unfortunately I don't have a 3110 to test with, but if you changed the filesystem type (by reformatting via MAX and selecting the other file system) would this change?

-Danny

[zou]

Reformat to Reliance filesystem solve the problem.

[Texas_Diaz]

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@zou wrote:

Reformat to Reliance filesystem solve the problem.

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Interesting.  If you reformat your disk back to FAT, does the problem come back / reproduce?

-Danny