Understanding a Volume Location in the Lightbits Cluster

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You can use the lbcli get volumes command for a specific volume to see which of the cluster nodes holds the data of a specific volume.

Sample Command

$ lbcli get volume --uuid=48dbbe54-1548-4444-866e-6438d4877e5f

In this command, the JWT is not stored in the lbcli configuration file:

$ lbcli -J $JWT get volume --project-name=proj-1 --uuid=48dbbe54-1548-4444-866e-6438d4877e5f

Sample Output

name: vol_3 rebuildProgress: None UUID: 48dbbe54-1548-4444-866e-6438d4877e5f Acl: Values: - hostnqn1 nsid: 4 size: "107374182400" nodeList: - 9a625dbf-de1b-4211-b9d3-0bdf70faa5f5 - 9f1a3a85-5be5-4f98-a44e-4271fbdbe7cc protectionState: FullyProtected replicaCount: 2 state: Created

You can also run the nvme list-subsys command on the application server.

Sample Command

# nvme list-subsys nvme0n1

Sample Output

nvme-subsys0 - NQN=nqn.2014-08.org.nvmexpress:NVMf:uuid:b550533c-8bb0-46df-9019-cd4c25c6e6e7 \ +- nvme0 tcp traddr=10.18.38.4 trsvcid=4420 live +- nvme1 tcp traddr=10.18.38.5 trsvcid=4420 live +- nvme2 tcp traddr=10.18.38.7 trsvcid=4420 live +- nvme3 tcp traddr=10.18.38.8 trsvcid=4420 live optimized +- nvme4 tcp traddr=10.18.38.29 trsvcid=4420 live inaccessible

This command’s output includes the cluster’s primary node (optimized) IP address for the volume, the secondary node (inaccessible) IP address, and the other nodes that do not hold data for that volume (block device nvme0n1).

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