Allowing 1-stripe components in a FLR-EC file with --ec 1+1 is critical for regular filesystem usage. This is the most common use case for plain files, or the first component of a PFL file and would allow EC to provide redundancy for these files. While this would double the space usage for this component, the 1-stripe component is normally going to be only a fraction of the size of later striped components (typically about 5% of capacity), so doubling this usage would not significantly affect overall filesystem capacity (e.g. only 5% increase in total space usage, vs 25% increase for the larger files).

Currently there is no test case in sanity-ec.sh that exercises the --ec 1+1 layout. Maybe it already works?