change check frequency for one client only?

I had a stability problem with a client where the disk may become
inaccessible. We have a test plan but needs something to detect whether the
disk is writable every minute. Hobbit is running on it. So,  if I can adjust
the check frequency for this client alone to 1m instead of the default 5m,
hobbit checks would fail then alert us, since hobbit clients needs to write
temp files.  Actually, this was how we get alerted yesterday.