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Each SAP HANA host requires a network connection to the dedicated storage network switches with 25 Gb/s link speed. For redundancy, the connection must have at least two NICs.
With two 25 Gb/s NICs on the SAP HANA hosts, you can optionally configure active/active interface groups on the SAP HANA hosts to use network bonding (bonds), where multiple network interfaces are aggregated into a single logical bonded interface. Hosts that are configured with bonds require Multi-Chassis Link Aggregation (MLAG) and Link Aggregation Control Protocol (LACP) on the switches.
The following figure shows a sample network topology, with the two network ports bonded on the SAP HANA host, MLAG with LACP on the switches, and all sixteen 25 Gb/s IP interface ports on the Unity XT connected to the switches:
The file systems for the SAP HANA persistence are created on the Unity XT array, as described in Create file systems for NAS (NFS). Add the _netdev mount option when mounting NAS devices. This option prevents the system from attempting to mount these file systems before the network has been enabled on the system.
When you install an SAP HANA system, either as a single-node instance or a multimode scale-out cluster, automate the mounting of the SAP HANA persistent devices by using /etc/fstab. The mounts must be evenly distributed across the Unity XT IP FE ports of the NAS servers, as shown in the following example:
192.168.1.120:/nasData-1 /hana/data/NAS/mnt00001 nfs4 rw,bg,hard,timeo=600,intr,noatime,vers=4.0,rsize=1048576,wsize=1048576,lock,_netdev 0 0
192.168.1.120:/nasLog-1 /hana/log/NAS/mnt00001 nfs4 rw,bg,hard,timeo=600,intr,noatime,vers=4.0,rsize=1048576,wsize=1048576,lock,_netdev 0 0
192.168.1.121:/nasData-2 /hana/data/NAS/mnt00002 nfs4 rw,bg,hard,timeo=600,intr,noatime,vers=4.0,rsize=1048576,wsize=1048576,lock,_netdev 0 0
192.168.1.121:/nasLog-2 /hana/log/NAS/mnt00002 nfs4 rw,bg,hard,timeo=600,intr,noatime,vers=4.0,rsize=1048576,wsize=1048576,lock,_netdev 0 0
192.168.1.122:/nasData-3 /hana/data/NAS/mnt00003 nfs4 rw,bg,hard,timeo=600,intr,noatime,vers=4.0,rsize=1048576,wsize=1048576,lock,_netdev 0 0
192.168.1.122:/nasLog-3 /hana/log/NAS/mnt00003 nfs4 rw,bg,hard,timeo=600,intr,noatime,vers=4.0,rsize=1048576,wsize=1048576,lock,_netdev 0 0