[SOLVED] Ceph 18.2.2 - How to partition disks

[zeuxprox]

Hello,

I have a Cluster of 6 Nodes with 4 3.2 TB NVMe Disks for each Node. Now I want to add a Node but I have 4 6.4 NVMe Disks. Now I would like to keep the Cluster balanced and therefore I would like to use only 3.2 TB on the disks of the new node. The question is: how should I partition 6.4 TB Disks to only use 3.2 TB?

Thank you

 

[gurubert]

Do these NVMe drives support multiple namespaces? With them the kernel sees more than one block device for each NVMe and you do not need partitions.

 

[zeuxprox]

Hi,

my NVMe disks are Micron 9300 MAX.

Thanks

 

[VictorSTS]

Just add 2 drives in two OSD instead of all 4: space will be balanced, but drives will have to work twice compared to the 4 drives in the other hosts. Shouldn't be critical unless your storage is under heavy load.

If you still want to partition new drives:

parted -s -a optimal /dev/nvmeXn1 -- mklabel gpt mkpart primary 0% 50% mkpart primary 50% 100%

Create the OSD from CLI:

ceph-volume lvm create --bluestore --data /dev/nvmeXn1p1 [--crush-device-class DEVICE_CLASS

 

[zeuxprox]

Just add 2 drives in two OSD instead of all 4: space will be balanced, but drives will have to work twice compared to the 4 drives in the other hosts. Shouldn't be critical unless your storage is under heavy load.

If you still want to partition new drives:

parted -s -a optimal /dev/nvmeXn1 -- mklabel gpt mkpart primary 0% 50% mkpart primary 50% 100%

Create the OSD from CLI:

ceph-volume lvm create --bluestore --data /dev/nvmeXn1p1 [--crush-device-class DEVICE_CLASS

Thank you!