红帽全球峰会20.4. Persistently setting DASDs online
The above instructions described how to activate DASDs dynamically in a running system. However, such changes are not persistent and do not survive a reboot. Making changes to the DASD configuration persistent in your Linux system depends on whether the DASDs belong to the root file system. Those DASDs required for the root file system need to be activated very early during the boot process by the initramfs to be able to mount the root file system.
The cio_ignore commands are handled seamlessly for persistent device configurations and you do not need to free devices from the ignore list manually.
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