BlockDevice CR creation for partitioned disks

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Ranjith Raveendran
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Currently, NDM is not selecting partitioned disks for creating device resource. But, you can create block device resource for the partitioned disks manually. The following are the steps for the creation of block device resource.

  1. Create the sample block device CR YAML using the following spec. Following is the sample block device CR YAML.

    apiVersion: openebs.io/v1alpha1
kind: BlockDevice
metadata:
  name: example-blockdevice
  labels:
    kubernetes.io/hostname: <host name in which disk/blockdevice is attached> # like gke-openebs-user-default-pool-044afcb8-bmc0
    ndm.io/managed: "false" # for manual disk creation put false
    ndm.io/blockdevice-type: blockdevice
status:
  claimState: Unclaimed
  state: Active
spec:
  capacity:
    logicalSectorSize: <logical sector size of lockdevice> # like 512
    storage: <total capacity in bits> #like 53687091200
  details:
    firmwareRevision: <firmware revision>
    model: <model name of blockdevice> # like PersistentDisk
    serial: <serial no of disk> # like google-disk-2
    compliance: <compliance of disk> #like "SPC-4"
    vendor: <vendor of disk> #like Google
  devlinks:
  - kind: by-id
    links:
    - <link1> # like /dev/disk/by-id/scsi-0Google_PersistentDisk_disk-2
    - <link2> # like /dev/disk/by-id/google-disk-2
  - kind: by-path
    links:
    - <link1> # like /dev/disk/by-path/virtio-pci-0000:00:03.0-scsi-0:0:2:0 
  Partitioned: Yes
  path: <devpath> # like /dev/sdb1

  2. Modify the created block device CR sample YAML with the partition disk information. In the above block device CR sample spec, the following fields must be filled before applying the YAML.

    • kubernetes.io/hostname: Hostname where the blockdevice is attached.
    • storage
    • links: This field should be filled for by-id and by-path. These details can be obtained from worker node by running the following command udevadm info -q property -n <device_path>
    • path: The value should be like /dev/sdb1 .

  3. Apply the modified YAML file to create the blockdevice CR for the provided partitioned device path.

  4. Repeat the same steps for each partitioned device and create blockdevice CR for each device.

  5. Verify if the blockdevice is created by running the following kubectl get blockdevice -n openebs command.

Note: If you are creating a block device CR for a partitioned device path, then you must add the corresponding disk under exclude filter so that NDM will not select the particular disk for BD creation. For example, /dev/sdb have 2 partitions, say /dev/sdb1 and /dev/sdb2. If block device CR is creating for /dev/sdb1 manually, then you must add /dev/sdb under exclude filter of NDM configuration. See here for customizing the exclude filter in NDM configuration.

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