We choose a set of gws that we don't use much (we do have 99 so great coverage) so we could, 1) connect and use them the week before to baseline how they perform, 2) connect to them after the migration and compare to the first week, 3) know we have stable gateways ready for when the remainder were moved the following weekend. Our experience was that for a user connected to a gwy that was migrated while still being used we had max 45 seconds for the GP client to re-connect to an alternative gwy. This matched our failover testing performance tests. Best, Simon.
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