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Thread: High availability for SAP NW 7.5 + SLES for SAP 15

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  1. Re: High availability for SAP NW 7.5 + SLES for SAP 15

    That's a complex task , but the cluster has a web interface for people with less experience.

    1. You need the high availability extension /in SLES 12 it was 'ha_sles' pattern/
    2. You have to setup the cluster . Use the 'ha-cluster-init' and pass everything necessary. As this is a VMware environment , you have to decide which approach will be taken:
    A) Do not use VmWare snapshots & use SBD for fencing, use btrfs snapshots
    B) Use Vmware snapahots (we use it for backup) & Do NOT use SBD for fencing (unless iSCSI is used which requires another machine), fencing mechanism will be Vmware based.

    Depending on the above , 'ha-cluster-init' should be used with different options.
    Setup /etc/hosts & Time sync (either chrony or ntp) - as these are critical for your cluster

    3. Define what the SAP App needs. I have only clusterised HANA , so I have no details about that.
    Usually a shared storage, Floating IP (cluster controlled), and start/stop script for the APP. The cluster supports systemd units, but they should be disabled on all nodes.

    For shared storage, keep in mind that there are 2 approaches - HA-LVM (supported with 2 corosync rings) or DLM/CLVMd (no support for 2 corosync rings).

    You can use the web interface (ha-cluster-init will tell you the IP + Port), bit channge the password for hacluster user on both nodees.

    P.S.: You can use 3 VMs - 2 to host the app and the 3-rd one to have an odd number of cluster nodes - for best quorum calculation.
    Last edited by strahil-nikolov-dxc; 18-Aug-2019 at 20:38.

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