Cluster nodes

The Cluster nodes page within the System administration shows information about the nodes within the cluster and information on the data distribution.

The page shows a wide range of statistics across the cluster and across individual nodes in the cluster:

Cluster Nodes

Figure 80. Cluster Nodes


  • Transfers

    Amount of data waiting to be replicated between nodes within the cluster.

  • Replication

    The configured replication factor and storage statistics for digest and storage nodes within the cluster.

    The total size that is displayed within these boxes includes the compressed ingested data that is found within LogScale segment files. It doesn't include additional duplicated or replicated data. Nor does it include LogScale's own system data.

    • Digest replication factor

      The target number of replicas for minisegments written by the digester, applying only to recently processed data. The storage replication factor is applied to data once it is merged into larger segments.

      The replication factor can be modified using the pencil icon.

    • Storage replication factor

      The storage replication factor is the target number of replicas for standard storage segments.

      The replication factor can be modified using the pencil icon.

  • Perfect

    Displays the amount of data that has been successfully stored and replicated as according to the storage replication factor as full segments.

    This figure includes the value of data also stored in bucket storage.

  • Low

    Amount of data (stored in segments) that has not yet been replicated to the replication factor. There is a short grace period before segments are included in this counter.

  • Absent

    Amount of data in segments that cannot be found on any node in the cluster. This can be due to servers not being available.

When calculating the sizes of information reported in these figures:

  • Merged segments are not counted if any of the original minis are still alive; in this case, only the original mini-segments are counted instead.

  • A segment that's missing will get listed in Absent rather than Perfect.

  • A segment that's poorly replicated will get listed in Low rather than Perfect.

  • A segment that has too many replicas will not get listed at all.

The rest of the window displays the list of nodes configured within the cluster:

  • ID

    The unique ID of the node

  • Name

    The hostname of the node, including port number, that can be used to access the node and used for inter-node communication.

  • Zone

    The zone for the node, or blank if no zone has been configured.

  • Digest

    The number of digest rules configured on this node.

  • Size

    The amount of space used on this node, including space used by other applications. The display will include the size of segment data stored on this node. The overall size include both primary and secondary storage. The bar chart shows an estimation of the data used for LogSCale system data (in gray) and ingested data (green).

  • Transfers

    The amount of data being transferred to and from the node during replication.

  • Evicting

    Whether the node is currently being removed from the cluster.

  • Removable

    Whether the node can be removed from the cluster. This is an indication of whether the data has been replcated from this node and it is safe to remove from the cluster as the data will have been replicated to another.

  • Version

    The version number of Falcon LogScale in use on this node.