Adding SSDs

You can add data SSDs after you have determined that the node currently manages less data SSDs than the maximum set value (maxDeviceCount).

Enter the lbcli list nvme-devices --data command to list all data SSDs that the Linux OS currently sees before inserting the new SSD. Unlike in the previous instance, use the --server-uuid flag to identify physical SSDs inserted into the server chassis that are not managed by the Lightbits node.

Sample Command

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$ lbcli list nvme-devices --server-uuid=fc9849f7-7380-48d8-904b-48a89c4da7a0 --data
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Sample Output

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Name  Size Serial       State   Server UUID                          Node UUID                              Usagenvme0n1 4T 700084450RGN Healthy fc9849f7-7380-48d8-904b-48a89c4da7a0 fb9c7b76-22f2-4fcf-af1a-70933c1dd3fb   Datanvme1n1 4T 7000SZ450RGN Healthy fc9849f7-7380-48d8-904b-48a89c4da7a0 fb9c7b76-22f2-4fcf-af1a-70933c1dd3fb   Datanvme2n1 4T 7000UM450RGN Healthy fc9849f7-7380-48d8-904b-48a89c4da7a0 fb9c7b76-22f2-4fcf-af1a-70933c1dd3fb   Datanvme3n1 4T 7000V9450RGN Healthy fc9849f7-7380-48d8-904b-48a89c4da7a0 fb9c7b76-22f2-4fcf-af1a-70933c1dd3fb   Data
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In this case, the output shows that all SSDs are currently managed by this node.

Insert the new SSD drive into any available physical slot.
Re-enter the lbcli list nvme-devices command.

Sample Command

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$ lbcli list nvme-devices --server-uuid=fc9849f7-7380-48d8-904b-48a89c4da7a0
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Sample Output

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Name   Size   Serial    State   Server UUID                          Node UUID                              Usagenvme0n1 4T 700084450RGN Healthy fc9849f7-7380-48d8-904b-48a89c4da7a0 fb9c7b76-22f2-4fcf-af1a-70933c1dd3fb   Datanvme1n1 4T 7000SZ450RGN Healthy fc9849f7-7380-48d8-904b-48a89c4da7a0 fb9c7b76-22f2-4fcf-af1a-70933c1dd3fb   Datanvme2n1 4T 7000UM450RGN Healthy fc9849f7-7380-48d8-904b-48a89c4da7a0 fb9c7b76-22f2-4fcf-af1a-70933c1dd3fb   Datanvme3n1 4T 7000V9450RGN Healthy fc9849f7-7380-48d8-904b-48a89c4da7a0 fb9c7b76-22f2-4fcf-af1a-70933c1dd3fb   Datanvme4n1 4T 910005450RGN None    fc9849f7-7380-48d8-904b-48a89c4da7a0 ---                                    UnManaged
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The output shows that nvme4n1 was added to the server, but is not managed by the Lightbits node because it does not include a node UUID (the usage of the device is marked as "UnManaged")

It is also possible to list only unmanaged SSDs by entering the lbcli list nvme-devices command with the following flags.

Sample Command

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$ lbcli list nvme-devices --server-uuid=fc9849f7-7380-48d8-904b-48a89c4da7a0 --device-usage=unmanaged
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Sample Output

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Name    Size  Serial        State     Server UUID                           Node UUID   Usagenvme4n1 4T    910005450RGN  None      fc9849f7-7380-48d8-904b-48a89c4da7a0  ---         UnManaged
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If you do not filter by the server-uuid flag, you will see a list of SSD devices across all Lightbits cluster servers.

Enter the lbcli add nvme-device command to add the new device to the Lightbits pool of SSDs. This command creates a background task for adding the block device.

Sample Command

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$ lbcli add nvme-device --serial-number=910005450RGN --node-uuid=fb9c7b76-22f2-4fcf-af1a-70933c1dd3fb
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This task can take several minutes for the Lightbits pool of SSDs to add the new device.

Enter the lbcli list nvme-devices command. The device is available in the Lightbits pool when this command's output shows the new device in the list with a valid node UUID.

Sample Command

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$ lbcli list nvme-devices --node-uuid=fb9c7b76-22f2-4fcf-af1a-70933c1dd3fb --data
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Sample Output

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Name   Size   Serial    State   Server UUID                          Node UUID                              Usagenvme0n1 4T 700084450RGN Healthy fc9849f7-7380-48d8-904b-48a89c4da7a0 fb9c7b76-22f2-4fcf-af1a-70933c1dd3fb   Datanvme1n1 4T 7000SZ450RGN Healthy fc9849f7-7380-48d8-904b-48a89c4da7a0 fb9c7b76-22f2-4fcf-af1a-70933c1dd3fb   Datanvme2n1 4T 7000UM450RGN Healthy fc9849f7-7380-48d8-904b-48a89c4da7a0 fb9c7b76-22f2-4fcf-af1a-70933c1dd3fb   Datanvme3n1 4T 7000V9450RGN Healthy fc9849f7-7380-48d8-904b-48a89c4da7a0 fb9c7b76-22f2-4fcf-af1a-70933c1dd3fb   Datanvme4n1 4T 910005450RGN Healthy fc9849f7-7380-48d8-904b-48a89c4da7a0 fb9c7b76-22f2-4fcf-af1a-70933c1dd3fb   Data
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The output shows that the new nvme4n1 device has been successfully added to the node, and its usage is marked as Data.

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