It looks like with OctezV10 we can now use rolling mode and have it maintain additional contexts in history beyond the default value of 5. I have a working existing v10.2 rolling node and I have stopped it and issued the command:
tezos-node config update --history-mode=rolling:15
I see it updated my config.json but when starting the node I get an error that I must use
use an additional config
But when I run the node with that command I get this error:
Error: Failed to get the nth predecessor of BMTrxPyWjYGGbW5HQ9ByhiQfQy4se5gG2T5kAXnxJXt8QjpxTCz. The offset is invalid: 47386
I even tried downloading a new v10.2 import of a rolling snapshot but get same kind of error. I'm sure there's a way here, but I haven't yet been able to figure it out.