> Space required during initial import: multiply the dump file by 8. For example, for English Wikipedia, the dump size is 10 GB. You should at least have 80 GB space free for the import process
> Space required when completed: multiply the dump file by 2.5. For example, for English Wikipedia, the dump size is 10 GB. When done, your English Wikipedia will be 25 GB.
Ouch, looks like I won't be trying this here any time soon.