standard internal load balancer remove member from backend pool

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we have a couple of NVAs deployed in a backend pool of a standard internal Load Balancer.  There is a slight issue with one of the NVAs, but the health check is showing it is healthy and still serving traffic to it.  The vendor is recommending taking some logs and rebooting.  Is there any benefit in removing the NVA from the backend pool before rebooting?  Does the LB continue to send existing session traffic to the NVA until they are complete and drain away, whilst only serving new traffic to the other NVA in the pool?  If not can this be configured?  Or are all sessions terminated immediately on the NVA removed from the pool, in which case, would it be just as well to reboot the NVA without removing from the pool first?

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