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Last modified: 24 October 2023


FITS table file writing slowness with NFS-mounted disks

Mac OS X platforms

16 April 2008

FITS table file writing through the CXC Data Model slows by a significant factor on Mac OS X machines when the data is accessed via a networked file system (NFS) mount.

Writing of images and ASCII tables is not affected; reading of any of these file formats is also unaffected.

The issue primarily affects users at an institution which uses networked file systems; see the workarounds for an example of checking for NFS mounts. Users working on a standalone machine or laptop that is not attached to a network are most likely using local disks and will not see the problem.

The CXC is exploring options to provide a more efficient buffering mechanism for the Data Model.