This is useful if you use automatic partitioning and want to be sure that some disks are ignored. For example, without ignoredisk, attempting to deploy on a SAN-cluster the Kickstart would fail, as the installation program detects passive paths to the SAN that return no partition table. Use this command only once.

Syntax

              ignoredisk --drives=drive1,drive2,... | --only-use=drive
            

Options

• --drives=driveN,…​ - Replace driveN with one of sda, sdb,…​, hda,…​ and so on.
• --only-use=driveN,…​ - Specifies a list of disks for the installation program to use. All other disks are ignored. For example, to use disk sda during installation and ignore all other disks:

  ignoredisk --only-use=sda

  To include a multipath device that does not use LVM:

  ignoredisk --only-use=disk/by-id/dm-uuid-mpath-2416CD96995134CA5D787F00A5AA11017

  To include a multipath device that uses LVM:

  ignoredisk --only-use=disk/by-id/scsi-58095BEC5510947BE8C0360F604351918

  You must specify only one of the --drives or --only-use.

Notes

• To specify a multipath device, use the format disk/by-id/scsi-WWID, where WWID is the world-wide identifier for the device. For example, to specify a disk with WWID 58095BEC5510947BE8C0360F604351918, use:

  ignoredisk --only-use=disk/by-id/scsi-58095BEC5510947BE8C0360F604351918

  This format is preferable for all multipath devices. If errors occur, multipath devices that do not use LVM can also use the disk/by-id/dm-uuid-mpath-WWID format, where WWID is the world-wide identifier for the device. For example, to specify a disk with WWID 2416CD96995134CA5D787F00A5AA11017, use:

  ignoredisk --only-use=disk/by-id/dm-uuid-mpath-2416CD96995134CA5D787F00A5AA11017

  Never specify multipath devices by device names like mpatha. Device names such as this are not specific to a particular disk. The disk named /dev/mpatha during installation might not be the one that you expect it to be. Therefore, the clearpart command could target the wrong disk.

• The sdX (or /dev/sdX) format does not guarantee consistent device names across reboots, which can complicate the usage of some Kickstart commands. When a command requires a device node name, you can use any item from /dev/disk as an alternative. For example, instead of using the following device name:

  ignoredisk --only-use=sda

  You can use an entry similar to one of the following:

  ignoredisk --only-use=/dev/disk/by-path/pci-0000:00:05.0-scsi-0:0:0:0

  ignoredisk --only-use=/dev/disk/by-id/ata-ST3160815AS_6RA0C882

  By using this approach, the command always targets the same storage device. This is especially useful in large storage environments. To explore the available device names on the system, you can use the ls -lR /dev/disk command during the interactive installation. For more information about different ways to consistently refer to storage devices, see Persistent naming attributes.