adv-partitioning-logical-partitions.rst

Logical Partitions

Due to the restriction of only having 4 physical partitions for disk, you can further partition a physical partition using logical partitioning. To partition a physical partition, use the filesystem type extended.

Note

You can only use the extended filesystem ONCE for a disk i.e. you can only partition one physical partition in a disk. When using extended you cannot declare a mount point or label. These will be ignored by hammr.

Like a physical partition, each logical partition has a unique number starting at 5 (5,6,7,8 etc) and declares a filesystem type and size. You cannot further partition a logical partition (extended filesystem type cannot be used). There is no limit to the number of logical partitions you may have, however the sum of the logical partitions cannot exceed the size of the physical partition.

Example

The following example shows 3 physical partitions of a disk, where the last physical partition has 3 logical partitions : /space, /home and /tmp.

---
partitioning:
  disks:
  - name: sda
    type: msdos
    size: 20480
    partitions:
    - number: 1
      fstype: ext3
      size: 2048
      mountPoint: "/boot"
    - number: 2
      fstype: linux-swap
      size: 1024
    - number: 3
      fstype: Extended
      size: 17408
      partitions:
      - number: 5
        fstype: ext3
        size: 8192
        mountPoint: "/space"
        label: space
      - number: 6
        fstype: ext3
        size: 8192
        mountPoint: "/home"
        label: home
      - number: 7
        fstype: ext3
        size: 1024
        mountPoint: "/tmp"
        label: tmp

If you are using JSON:

{
    "partitioning": {
        "disks": [
          {
            "name": "sda",
            "type": "msdos",
            "size": 20480,
            "partitions": [
              {
                "number": 1,
                "fstype": "ext3",
                "size": 2048,
                "mountPoint": "/boot"
              },
              {
                "number": 2,
                "fstype": "linux-swap",
                "size": 1024
              },
              {
                "number": 3,
                "fstype": "Extended",
                "size": 17408,
                "partitions": [
                  {
                    "number": 5,
                    "fstype": "ext3",
                    "size": 8192,
                    "mountPoint": "/space",
                    "label": "space"
                  },
                  {
                    "number": 6,
                    "fstype": "ext3",
                    "size": 8192,
                    "mountPoint": "/home",
                    "label": "home"
                  },
                  {
                    "number": 7,
                    "fstype": "ext3",
                    "size": 1024,
                    "mountPoint": "/tmp",
                    "label": "tmp"
                  }
                ]
              }
            ]
          }
        ]
    }
}