HP 530 Management Manual page 284

Special Features
sFlow
8-14
The sFlow collector reserves the instance by writing its owner string into
that instance on the sFlow receiver table. The sFlow collector, or receiver,
also configures a receiver timeout value for itself. The agent counts down
the receiver timeout, and when the timeout falls low, the sFlow receiver
renews the reservation. If the agent fails to receive a message before the
timeout expires, the agent erases the sFlow receiver's owner string and allows
another sFlow receiver to claim the instance.
When the collector reserves a receiver instance, it also configures one or both
of two types of sFlow instances. One type allows the collector to receive
flow samples, and the other allows the collector to receive counters from
polled radios.
When the sFlow receiver automatically configure sFlow, all settings are
controlled through the sFlow receiver's management software, including
settings for flow sampling rates and counter polling intervals.