Can I delete old log files manually?

My apologies for mail bombing the list. I'm banging my head against a
production issue.

In short, can I delete old log and index files manually? I have two brokers
out of five that are hosting ~1200 partitions each, though based on my
understanding from a previous email they should really only be hosting
about 700 and are sized as such. I'm running out of disk space rapidly. I
have my purge set to 3 days and there are logs in there that are 3 days old
but haven't been purged yet. I'm worried I'm going to run out of disk space
before they are deleted.

Is this safe?

I think I need to specify the size as well to help mitigate this but
without knowing how many partitions will be hosted it's tough to size that
as well.

Thanks for your patience.