[MITgcm-support] MNC and 2GB files

[Ed Hill]

Hi folks (especially Baylor, Helen, & Karsten),

The very latest version of MITgcm (in CVS) now has the ability to create
additional NetCDF files instead of trying to grow individual files
indefinitely.  The sequence has the naming convention:

  BASE_NAME.SEQ_NUM.TILE_NUM.nc  (eg. "state.0000.000001.nc")

where SEQ_NUM will grow as necessary.  This should be a welcome feature
for those of you who've encountered flaky or non-existent large-file
support (typically, files on the order of 2GB or larger) on some
platforms.

The option is configurable using the "data.mnc" namelist file:

  mnc_max_fsize = 3.0E7

which specifies an approximate upper limit to the total number of bytes
that any individual NetCDF file should hold.  The default is just less
than 2GB.

And please report any bugs or problems you encounter.

thanks,
Ed

-- 
Edward H. Hill III, PhD
office:  MIT Dept. of EAPS;  Rm 54-1424;  77 Massachusetts Ave.
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