Hi,
Probably you have a lot of data in your datavalue table. When you run the upgrade, it seems some indexes are dropped and recreated in the datavalue table, which is a process that requires a constant increase in space used until it completes. Could be another table.
In general, the solution is to allow it to continue the process, as long as you ensure that the space is adequate. so unfortunately, once it stops on the way there is no clear way to clear that space that was used already - so you quickly run out with every try afterwards. Clear your space used first, however way is easier for you and try again - wait for a long as it takes.
You might need up to 1TB, and at the end it might use up to 30-50% of the space. It will also take some time, so you should be patient. Mignt be other errors too, so keep watching the logs for errors.
Anyhow, some thoughts.
Regards,
Ranga