Setting up NTP servers

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http://serverfault.com – I have a problem setting up NTP to maintain time on a stand-alone network. This will be an island time-zone. The problem is that the time drifts apart, even after they have been initially synchronised. There are two redundant NTP servers running RHEL 5.4 and several Windows XP clients. The requirements are that the network syncs to server A whilst server B acts as a backup. We do have a GPS that acts as a time server controlling both server A and server B, but it is not always available. When the GPS is present, both servers sync to the GPS. The XP clients seem to divide into two groups once (HowTos)