Re: PyNIO and NetCDF file sizes - File too large

From: Carl Drews <drews_at_nyahnyahspammersnyahnyah>
Date: Tue Jan 19 2010 - 12:11:40 MST

Mary and Dave -

Thanks for checking. I installed PyNIO from your binary, not from
source code. How can I check for large file support within my NetCDF
install?

The offending file is on its way to you.

Carl

Mary Haley wrote:
> Hi Carl,
>
> Dave Brown thinks that the version of PyNIO you have should work on a
> file this large, unless you built PyNIO from source code and didn't link
> it against a NetCDF library that had large file support turned on.
>
> If you are using the PyNIO binary from our website, then we're not sure
> why it's not working. Would it be possible for you to put the file
> somewhere that we could download it?
>
> Thanks,
>
> --Mary
>
>
>
> On Jan 19, 2010, at 10:35 AM, Carl Drews wrote:
>
>> I am attempting to open a 17 Gigabyte NetCDF file:
>>
>> 16949113596 Jan 18 04:51 ocean_his-T1.nc
>>
>> using this Python code:
>>
>> import Nio
>> import matplotlib
>> from pylab import *
>> import numpy
>> ...
>> # open the NetCDF file for reading
>> print "Nio version ", Nio.__version__
>> file = Nio.open_file(romsFile, 'r')
>>
>> Here is the script output:
>>
>> ROMS file = ocean_his-T1.nc
>> Nio version 1.3.0b1
>> fatal:File too large
>> fatal:Could not open (ocean_his-T1.nc)
>> Traceback (most recent call last):
>> File "waterLand.py", line 188, in <module>
>> file = Nio.open_file(romsFile, 'r')
>> File "/usr/local/python/lib/python2.5/site-packages/PyNIO/Nio.py",
>> line 512, in open_file
>> file = _Nio.open_file(filename,mode,options,history,format)
>> NIOError: Unable to open file
>>
>> Is there a limit on the NetCDF file size? I need to read several
>> variables from this model output. Do I have to split the ocean_his-T1
>> file into multiple variables? If so, what maximum size is allowed?
>>
>> Here is my system information (uname -a):
>>
>> Linux acd-xxxxxx 2.6.18-164.6.1.el5.centos.plus #1 SMP Wed Nov 4
>> 09:36:36 EST 2009 i686 i686 i386 GNU/Linux
>>
>> Thanks!
>>
>> Carl
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>
>
Received on Tue Jan 19 12:11:45 2010

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