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15.3. Partitioning the disk

To run the full pre-caching process, you have to boot from a live ISO and use the factory-precaching-cli tool from a container image to partition and pre-cache all the artifacts required.

A live ISO or RHCOS live ISO is required because the disk must not be in use when the operating system (RHCOS) is written to the device during the provisioning. Single-disk servers can also be enabled with this procedure.

Prerequisites

  • You have a disk that is not partitioned.
  • You have access to the quay.io/openshift-kni/telco-ran-tools:latest image.
  • You have enough storage to install OpenShift Container Platform and pre-cache the required images.

Procedure

  1. Verify that the disk is cleared: 

    # lsblk

    Example output

    NAME    MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
loop0     7:0    0  93.8G  0 loop /run/ephemeral
loop1     7:1    0 897.3M  1 loop /sysroot
sr0      11:0    1   999M  0 rom  /run/media/iso
nvme0n1 259:1    0   1.5T  0 disk

  2. Erase any file system, RAID or partition table signatures from the device: 

    # wipefs -a /dev/nvme0n1

    Example output

    /dev/nvme0n1: 8 bytes were erased at offset 0x00000200 (gpt): 45 46 49 20 50 41 52 54
/dev/nvme0n1: 8 bytes were erased at offset 0x1749a955e00 (gpt): 45 46 49 20 50 41 52 54
/dev/nvme0n1: 2 bytes were erased at offset 0x000001fe (PMBR): 55 aa

重要

The tool fails if the disk is not empty because it uses partition number 1 of the device for pre-caching the artifacts.

15.3.1. Creating the partition
复制链接

Once the device is ready, you create a single partition and a GPT partition table. The partition is automatically labelled as data and created at the end of the device. Otherwise, the partition will be overridden by the coreos-installer.

重要

The coreos-installer requires the partition to be created at the end of the device and to be labelled as data. Both requirements are necessary to save the partition when writing the RHCOS image to the disk.

Prerequisites

  • The container must run as privileged due to formatting host devices.
  • You have to mount the /dev folder so that the process can be executed inside the container.

Procedure

In the following example, the size of the partition is 250 GiB due to allow pre-caching the DU profile for Day 2 Operators.

  1. Run the container as privileged and partition the disk: 

    # podman run -v /dev:/dev --privileged \
--rm quay.io/openshift-kni/telco-ran-tools:latest -- \
factory-precaching-cli partition \
    1 
    
-d /dev/nvme0n1 \
    2 
    
-s 250
    3
    1
    Specifies the partitioning function of the factory-precaching-cli tool.
    2
    Defines the root directory on the disk.
    3
    Defines the size of the disk in GB.

  2. Check the storage information: 

    # lsblk

    Example output

    NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
loop0         7:0    0  93.8G  0 loop /run/ephemeral
loop1         7:1    0 897.3M  1 loop /sysroot
sr0          11:0    1   999M  0 rom  /run/media/iso
nvme0n1     259:1    0   1.5T  0 disk
└─nvme0n1p1 259:3    0   250G  0 part

Verification

You must verify that the following requirements are met:

  • The device has a GPT partition table
  • The partition uses the latest sectors of the device.
  • The partition is correctly labeled as data.

Query the disk status to verify that the disk is partitioned as expected: 

# gdisk -l /dev/nvme0n1

Example output

GPT fdisk (gdisk) version 1.0.3

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/nvme0n1: 3125627568 sectors, 1.5 TiB
Model: Dell Express Flash PM1725b 1.6TB SFF
Sector size (logical/physical): 512/512 bytes
Disk identifier (GUID): CB5A9D44-9B3C-4174-A5C1-C64957910B61
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33
First usable sector is 34, last usable sector is 3125627534
Partitions will be aligned on 2048-sector boundaries
Total free space is 2601338846 sectors (1.2 TiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1      2601338880      3125627534   250.0 GiB   8300  data

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