Known issues with Parallel VDS

[hyoklee]

These issues are from HDFFV-10287:

• "printf" style mappings are not supported.
• The VDS must be opened collectively.
• When using separate source file(s), the source file(s) cannot be opened by the library while the VDS is open.
• When using separate source file(s), data cannot be written through the VDS unless the mapping is equivalent to 1 process per source file.
• All I/O is independent internally (possible performance penalty).
• Each rank does an independent open of each source file it accesses (possible performance penalty).

[derobins]

Is this just a documentation request or is this a feature implementation/improvement request?