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Dell PowerFlex Appliance with PowerFlex 4.x Administration Guide

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Redistribute the MDM cluster

Use this procedure to redistribute the MDM cluster manually.

It is critical that the MDM cluster is distributed across access switches and physical cabinets to ensure maximum resiliency and availability of the cluster. The location of the MDM components should be checked and validated during every engagement, and adjusted if found noncompliant with the published guidelines. If an expansion includes adding physical cabinets and access switches, you should relocate the MDM cluster components.

When adding new MDM or tiebreaker nodes to a cluster, first place the PowerFlex storage-only nodes (if available), followed by the PowerFlex hyperconverged nodes.

Prerequisites

  • Identify new nodes to use as MDM or tiebreaker.
  • Identify the management IP address, data1 IP address, and data2 IP address (log in to each new node or SVM and enter the IP addr command).
  • Gather virtual interfaces for the nodes being used for the new MDM or tiebreaker, and note the interface of data1 and data2. For example, for a PowerFlex storage-only node, the interface is bond0.152 and bond1.160. If it is an SVM, it is eth3 and eth4.
  • Identify the primary MDM.

Steps

  1. SSH to each new node or SVM and assign the proper role (MDM or tiebreaker) to each.
  2. Transfer the MDM and LIA packages to the newly identified MDM cluster nodes.
    NOTE:The following steps contain sample versions of PowerFlex files as examples only. Use the appropriate PowerFlex files for your deployment.
  3. To install the LIA, enter TOKEN=<flexos password> rpm -ivh EMC-ScaleIO-lia-3.x-x.xxx.el7.x86_64.rpm.
  4. To install the MDM service:
    • For the MDM role, enter MDM_ROLE_IS_MANAGER=1 rpm -ivh EMC-ScaleIO-mdm-3.x-x.xxx.el7.x86_64.rpm
    • For the tiebreaker role, enter MDM_ROLE_IS_MANAGER=0 rpm-ivh EMC-ScaleIO-mdm-3.x-x.xxx.el7.x86_64.rpm.
  5. Open an SSH terminal to the primary MDM and log in to the operating system.
  6. Log in to PowerFlex by entering scli –-login --username admin –-password <powerflex password>.
  7. Add new standby MDM by entering scli --add_standby_mdm --mdm_role manager --new_mdm_ip <new mdm data1, data2 ip’s> --new_mdm_management_ip <mdm management IP> --new_mdm_virtual_ip_interfaces <list both interface, comma seperated> --new_mdm_name <new mdm name>.
  8. Add a new standby tiebreaker by entering scli --add_standby_mdm --mdm_role tb --new_mdm_ip <new tb data1, data2 ip’s> --new_mdm_name <new tb name>.
  9. Repeat Steps 7 and 8 for each new MDM and tiebreaker that you are adding to the cluster.
  10. Enter scli –-query_cluster to find the ID for the current MDM and tiebreaker. Note the IDs of the MDM and tiebreaker being replaced.
  11. To replace the MDM, enter scli --replace_cluster_mdm --add_slave_mdm_id <mdm id to add> --remove_slave_mdm_id <mdm id to remove>.
    Repeat this step for each MDM.
  12. To replace the tiebreaker, enter scli --replace_cluster_mdm --add_tb_id <tb id to add> --remove_tb_id <tb id to remove>.
    Repeat this step for each tiebreaker.
  13. Enter scli -–query_cluster to find the IDs for MDMs and tiebreakers being removed.
  14. Using IDs to remove the old MDM, enter scli --remove_standby_mdm --remove_mdm_id <mdm id to remove>.
    NOTE:This step might not be necessary if this MDM remains in service as a standby.
  15. To remove the old tiebreaker, enter scli --remove_standby_mdm --remove_mdm_id <mdm id to remove>.
    NOTE:This step might not be necessary if this tiebreaker remains in service as a standby.
  16. Repeat these steps as needed.

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