Summary of looksAlive and isAlive polling
looksAlive and isAlive are intervals at which MSCS calls back into the resource types supplied library code and requests that the resource performs checks to determine the working status of itself. This ultimately determines if MSCS attempts to fail over the resource.
On every occasion that the looksAlive interval elapses (default 5000 ms), the queue manager resource is called to perform its own check to determine if its status is satisfactory.
On
every occasion that the isAlive interval elapses
(default 30000 ms), another call is made to the queue manager resource
for it to perform another check to determine if the resource is functioning correctly. This enables
two levels of resource type checking.
- A looksAlive status check to establish if the resource appears to be functioning.
- A more significant isAlive check that determines if the queue manager resource is active.