Identifying Unused Slots
From a Linux shell on any of the Lightbits servers, enter the lbcli list nvme-devices command to see how many SSDs are managed by the Lightbits node that you want to add SSDs to.
Sample Command
$ lbcli list nvme-devices --node-uuid=fb9c7b76-22f2-4fcf-af1a-70933c1dd3fbA -J flag after lbcli indicates that the JWT is not stored in the lbcli configuration file.
Sample Output
Name Size Serial Server UUID Node UUIDnvme0n1 4T 700084450RGN fc9849f7-7380-48d8-904b-48a89c4da7a0 fb9c7b76-22f2-4fcf-af1a-70933c1dd3fbnvme1n1 4T 7000SZ450RGN fc9849f7-7380-48d8-904b-48a89c4da7a0 fb9c7b76-22f2-4fcf-af1a-70933c1dd3fbnvme2n1 4T 7000UM450RGN fc9849f7-7380-48d8-904b-48a89c4da7a0 fb9c7b76-22f2-4fcf-af1a-70933c1dd3fbnvme3n1 4T 7000V9450RGN fc9849f7-7380-48d8-904b-48a89c4da7a0 fb9c7b76-22f2-4fcf-af1a-70933c1dd3fbThe output shows that this Lightbits node currently uses four NVMe drives.
Next, enter the lbcli get node command to check the maximum number of NVMe devices this node was configured to manage, as set by maxDeviceCount in the initial configuration.
Sample Command
$ lbcli get node --uuid=fb9c7b76-22f2-4fcf-af1a-70933c1dd3fb -o jsonA -J flag after lbcli indicates that the JWT is not stored in the lbcli configuration file.
Sample Output
UUID: fb9c7b76-22f2-4fcf-af1a-70933c1dd3fbclusterManagerMode: PassiveModefailureDomains:- rack03-server54hostname: rack03-server54maxNvmeDevices: 12name: server07-0nvmeEndpoint: 10.18.35.15:4420state: ActiveThe output shows that this Lightbits node supports up to 12 NVMe SSDs.
Up to eight more SSDs can be added to this node. The lbcli list nvme-devicescommand showed that the node currently uses four NVMe drives and the lbcli get node command showed that a maximum of 12 devices can be used on this node.