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Verifying cluster health

Before and after you upgrade, revert, or downgrade a cluster, you should verify that the nodes are healthy and eligible to participate in the cluster, and that the cluster is in quorum.

  1. Verify that the nodes in the cluster are online and are eligible to participate in the cluster: cluster show

    Example

    TDC-DM7K::*> cluster show
    Node                 Health  Eligibility   Epsilon
    -------------------- ------- ------------  ------------
    TDC-7K-01   true    true          false
    TDC-7K-02   true    true          false

    If any node is unhealthy or ineligible, check EMS logs for errors and take corrective action.

  2. Set the privilege level to advanced: set -privilege advanced

  3. Enter y to continue.
  4. Verify the configuration details for each RDB process.

    • The relational database epoch and database epochs should match for each node.

    • The per-ring quorum master should be the same for all nodes.

      Note that each ring might have a different quorum master.

    To display this RDB process...Enter this command...
    Management applicationcluster ring show -unitname mgmt
    Volume location databasecluster ring show -unitname vldb
    Virtual-Interface managercluster ring show -unitname vifmgr
    SAN management daemoncluster ring show -unitname bcomd

    Example

    This example shows the volume location database process:
    TDC-DM7K::*> cluster ring show -unitname vldb
    Node      UnitName Epoch    DB Epoch DB Trnxs Master    Online
    --------- -------- -------- -------- -------- --------- ---------
    TDC-7K-03     vldb     154      154      14847    TDC-7K-03     master
    TDC-7K-01     vldb     154      154      14847    TDC-7K-03     secondary
    TDC-7K-02     vldb     154      154      14847    TDC-7K-03     secondary
    TDC-7K-04     vldb     154      154      14847    TDC-7K-03     secondary
    4 entries were displayed.

  5. If you are operating in a SAN environment, verify that each node is in a SAN quorum: event log show -messagename scsiblade.*

    The most recent scsiblade event message for each node should indicate that the scsi-blade is in quorum.

    Example

    TDC-DM7K::*> event log show -messagename scsiblade.*
    Time                Node             Severity      Event
    ------------------- ---------------- ------------- ---------------------------
    MM/DD/YYYY TIME  TDC-7K-03            INFORMATIONAL scsiblade.in.quorum: The scsi-blade ...
    MM/DD/YYYY TIME  TDC-7K-01            INFORMATIONAL scsiblade.in.quorum: The scsi-blade ...

  6. Return to the admin privilege level: set -privilege admin
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