don’t try creating gdbm file on an nfs mount

gems/gdbm-1.2/lib/gdbm.rb:256:in `initialize': Empty database (GDBMError)

error occurs when trying to use

g = GDBM.new('somefile')

on an nfs-mounted partition. GDBM works fine on normal drives, just don’t try it on nfs-mounts. Posting this as I found nothing when I googled the error message, and wasted several minutes before I realized the problem. The error message may be specific to the ruby ‘gdbm’ gem, but the rule is a general one.

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