If you have not yet planned how you will set up your partitions, turn to Appendix B. There you'll find an introduction to basic disk partitioning concepts. As a bare minimum, you'll need an appropriately-sized root partition, and a swap partition of at least 16 MB.

Figure 14-14 shows the two disk partitioning applications that are available for you to use.

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Base OS: Red Hat Enterprise Linux (RHEL) 7.5 or later with the 'Minimal' installation option and the latest packages from the Extras channel, or RHEL Atomic Host 7.4.5 or later. IBM POWER9: RHEL-ALT 7.5 with the 'Minimal' installation option and the latest packages from the Extras channel. To register your system to Customer Portal Subscription Management use the following command.

If you will be using fdisk to partition your drive, please see the section called Using fdisk for those instructions. If you select Disk Druid, continue reading below.

Figure 14-14. Disk Setup Dialog

The following sections describe the layout of Figure 14-15 and how to use its buttons to set up partitions. If you're already familiar with Disk Druid, you can partition your disk and skip to the section called Choose Partitions to Format Dialog.

You use the disk partitioning dialogs to tell the installation program where to install Red Hat Linux (Figure 14-15).

Figure 14-15. Disk Druid Main Screen

The Current Disk Partitions Section

Each line in the Current Disk Partitions section represents a disk partition. In this example (Figure 14-15), there are Linux existing partitions.

Note the scroll bar to the right, which indicates that there may be more partitions than can be displayed at one time. If you use the Up and Down arrow keys, you can see if there are any additional partitions. Each line in this section has five different fields:

Mount Point -- Indicates where the partition will be mounted when Red Hat Linux is installed (such as /, /boot, or swap).
Device -- Displays specific hard drive and partition information. Free mod installer.
Requested -- Shows the partition's initial size.
Actual -- Shows the partition's current size.
Type -- Shows the partition's type.

As you scroll through the Current Disk Partitions section, you might see an Unallocated Requested Partitions title bar, followed by one or more partitions. These are partitions that have been requested but, for one reason or another, have not been allocated. A common reason for having an unallocated partition is a lack of sufficient free space for the partition. In any case, the reason the partition remains unallocated will be displayed after the partition's mount point.

The Drive Summaries Section

Each line in the Drive Summaries section represents a hard disk on your system. Each line has the following fields:

Drive -- Shows the hard disk's device name.
Geom [C/H/S] -- Shows the hard disk's geometry. The geometry consists of three numbers representing the number of cylinders, heads and sectors as reported by the hard disk.
Total -- Shows the total available space on the hard disk.
Used -- Shows how much of the hard disk's space is currently allocated to partitions.
Free -- Shows how much of the hard disk's space is still unallocated.
Bar Graph -- Presents a visual representation of the space currently used on the hard disk. The more pound signs there are between the square braces, the less free space there is. In Figure 14-15, the bar graph shows no free space.

Please Note

The Drive Summaries section is displayed only to indicate your computer's disk configuration. It is not meant to be used as a means of specifying the target hard drive for a given partition. This is described more completely in the section called Adding a Partition.

Disk Druid's Buttons

These buttons control Disk Druid's actions. They are used to add and delete partitions, and to change partition attributes. In addition, there are buttons that are used to accept the changes you've made, or to exit Disk Druid entirely. Let's take a look at each button in order.

Add -- Request a new partition. Selecting this button causes a dialog box to appear containing fields that must be filled in.
Edit -- Modify the mount point of the partition currently highlighted in the Current Disk Partitions section. Selecting this button will cause a dialog box to appear allowing you to change the name of the mount point.
Delete -- Delete the partition currently highlighted in the Current Disk Partitions section. Selecting this button will cause a dialog box to appear asking you to confirm the deletion.
OK -- Confirm that changes made to your system's partitions to be written to disk. You will be asked to confirm the changes before Disk Druid rewrites your hard disk partition table(s). In addition, any mount points you've defined are passed to the installation program, and will eventually be used by your Red Hat Linux system to define the filesystem layout.
Back -- Abort without saving any changes you've made. When this button is selected, the installation program will take you back to the previous screen, so you can start over.

Handy Function Keys

Use the F5 (Reset) function key to discard all changes you may have made while in Disk Druid, and return the list of partitions to those read from the partition table(s) on your hard disk(s). When selected, you'll be asked to confirm whether you want to discard the changes. Note that any mount points you've specified will be lost, and will need to be reentered.

Please Note

You will need to dedicate at least one partition to Red Hat Linux, and optionally more. This is discussed more completely in the section called How Many Partitions? in Appendix B.

Adding a Partition

To add a new partition, select the Add button and press Space o

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