Summary:
The VDDK importer is currently not utilizing AIO pread from libnbd and instead relies on the synchronous pread.  
Issue Details: 

• The importer only performs synchronous read operations, which can be a bottleneck.
• Additional development is needed to ensure AIO pread is used properly throughout the process.
• The setting for AIO pread appears to be taking effect, but the importer does not fully use it.
• On WARM mitigation using CDI 

Expected Behavior:

• The importer should leverage AIO pread from libnbd instead of the synchronous method for improved performance.