Configuring the host to run failover

The SUSE Linux Enterprise Server host requires configuration changes to run failover. The failover solution uses DM-MP.

Before you begin

You have installed the required packages on your system.
For Red Hat (RHEL) hosts, verify the packages are installed by running rpm -q device-mapper-multipath
For SLES hosts, verify the packages are installed by running rpm -q multipath-tools
Note: Refer to the NetApp Interoperability Matrix Tool (IMT) to ensure any required updates are installed as multipathing may not work correctly with the GA versions of SLES or RHEL.

About this task

By default, DM-MP is disabled in RHWL and SLES. Complete the following steps to enable DM-MP components on the host.

Procedure

Add the NVMe E-Series device entry to the devices section of the /etc/multipath.conf file, as shown in the following example:

devices {
        device {
                vendor "NVME"
                product "NetApp E-Series*"
                path_grouping_policy group_by_prio
                failback immediate
                no_path_retry 30
        }
}

Configure multipathd to start at system boot.
```
# systemctl enable multipathd
```
Start multipathd if it is not currently running.
```
# systemctl start multipathd
```
Verify the status of multipathd to make sure it is active and running:
```
# systemctl status multipathd
```