onspaces -m ... -f parameter

Can somebody give me an example, or a description of the file format required for the -f parameter, when associated with onspaces -m (to mirror chunks). I have several hundred chunks in each dbspace and I need it because the onspaces command would be too long otherwise. Normally I mirror in the disk array or using the logical volume manager but thats impossible in this case so I need to use IDS. I couldn't find any detail in the 9.40 manuals, just an overview of the fact that the paramter exists.

Found it myself - by trying a guess at the format, if you are wrong it tells you what the format should be. For every chunk in the dbspace to be mirrored you need a line like this: primary-chunk-path offset mirror-chunk-path offset