Using a different drive for storage, I changed the cache_locations.txt file to point to it.
It's working OK but when I try to import blocks it errors
move_block_to_subdir(): ERROR: rename() failed
move_block_to_subdir(): ERROR: oldpath /home/user3/temp/2c5f01f81d489c6de3e7034dc7574451ce8cb2a0.ofb
move_block_to_subdir(): ERROR: newpath /bighd/user3/blockcache/2c/2c5f01f81d489c6de3e7034dc7574451ce8cb2a0.ofb
The file does not appear in blockcache where it should.
It's also not clear if the import feature checks blocks as they are imported. "Import and check blocks"