Depending on the systems age it was often used as a out of band management connection to help isolate the two data feeds.
Some servers used the dual connection for Web server connection sprayer so the internet connections where spread out to a bank of servers or a dual connected firewall.
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When the connection was 100GB to gain a bit more power we often bonded the 2 NICs together getting a 200GB connection.
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When the connection was 100Gb to gain a bit more power we often bonded the 2 NICs together getting a 200Gb connection.
Depending on the systems age it was often used as a out of band management connection to help isolate the two data feeds.
Some servers used the dual connection for Web server connection sprayer so the internet connections where spread out to a bank of servers or a dual connected firewall.
When the connection was 100GB to gain a bit more power we often bonded the 2 NICs together getting a 200GB connection.