We use HP IP KVM switches for our DC. It's a 16 port switch. You can get 8 port hubs with an uplink to the main switch, meaning you can attach 128 servers per switch. So, depending on your server density you could one or several rows of racks served by one switch. Careful though, because the cables can't be Ethernet "Lite" with only 2 pairs pinned out. All 4 pairs have to be pinned out.
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We use HP IP KVM switches for our DC. It's a 16 port switch. You can get 8 port hubs with an uplink to the main switch, meaning you can attach 128 servers per switch. So, depending on your server density you could one or several rows of racks served by one switch. Careful though, because the cables can't be Ethernet "Lite" with only 2 pairs pinned out. All 4 pairs have to be pinned out.