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Nowadays we often meet systems with RDMA connections configured for increasing the performance of the system. Also, it’s not a news that we can meet environments with the different OS installed. In our case, we will be looking into a vital aspect of the process – the performance of RDMA connections. So, let’s have a look at the configuration of RDMA and what we need for building and testing RDMA connections, problems that you possibly can face, and the final part is making it perform in a way that will make us happy. So, let’s start.

Today we will look at one of them – Challenge Handshake Authentication Protocol or CHAP. Before we start, let me tell you a few words about CHAP. Challenge Handshake Authentication Protocol (CHAP) is a network login protocol that uses a challenge-response mechanism. You can use CHAP authentication to restrict iSCSI access to volumes and snapshots to hosts that supply the correct account name and password (or “secret”) combination. Using CHAP authentication can facilitate management of access controls because it restricts the access through account names and passwords, instead of IP addresses or iSCSI initiator names.