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A group displays the sequence number between angle brackets. For example, <3,6>: { 1-3:0-11 }, the sequence number is <3,6>.
The first number within the sequence, in this case 3, identifies the node that initiated the most recent group change.
In the case of a node leaving the group, the lowest-numbered node remaining in the cluster will initiate the group change and thus appear as the first number within the angle brackets. In the case of a node joining the group, the newly joined node will initiate the change and thus will be the listed node. If the group change involved a single drive joining or leaving the group, the node containing that drive will initiate the change and thus will be the listed node. The second piece of the group sequence is the counter, which increases sequentially.