If enabled, MongoDB preallocate at least 2 2GB files on the filesystem. It gives better insertion performances, but wastes precious VM space. In the DemoVM context, we dont need optimized insertion performances as MongoDB is only a storage backend for operatinal data without any operational application connected to feed it.
Disabled MongoDB file preallocation
If enabled, MongoDB preallocate at least 2 2GB files on the
filesystem. It gives better insertion performances, but wastes
precious VM space. In the DemoVM context, we dont need optimized
insertion performances as MongoDB is only a storage backend for
operatinal data without any operational application connected to
feed it.