Overriding the auto-configuration for devices that are used early in the boot process

Red Hat Enterprise Linux 8.6 LPAR mode

With chzdev, you can override settings from the auto-configuration in the active configuration or persistently. Some persistent settings for devices that are set online early in the boot process must be included in the initial RAM disk.

Use the chzdev command to set the zdev:early device attribute for such devices.

Example:

# chzdev -e dasd-fba e030 zdev:early=1
FBA DASD 0.0.e030 configured
Note: The initial RAM-disk must be updated for these changes to take effect:
- FBA DASD 0.0.e030
Update initial RAM-disk now? (yes/no) yes

Do not indiscriminately include configuration settings in the initial RAM disk. To remove settings for a device, remove the zdev:early attribute from the device settings.

Example:

# chzdev -e dasd-fba e030 --remove-attribute zdev:early
FBA DASD 0.0.e030 configured
Note: The initial RAM-disk must be updated for these changes to take effect:
- FBA DASD 0.0.e030
Update initial RAM-disk now? (yes/no) yes

Use the lszdev command to list all devices that are configured with the zdev:early attribute.

Example:

# lszdev --by-attr zdev:early=1
TYPE     ID                                             ON  PERS NAMES
dasd-fba 0.0.e030                                       yes yes  dasda
zfcp-lun 0.0.1911:0x50050763070845e3:0x4082409f00000000 no  yes