Am 31.03.2011 16:44, schrieb Tom Gundersen: > On systemd systems with initramfs and LVM used, packagers must > make sure, that the systemd and initramfs versions match. The initramfs > needs to create the /run/ mountpoint for udev to store the data, and > mount this tmpfs to /run in the rootfs, so the that the udev database > is preserved for the udev version started in the rootfs. > *** > > The last paragraph is admittedly referring to systemd, but I think > this is not important (I think the same case would apply to any init > system mounting /run). Here I get the impression that there is > something valuable in the udev database that could and should be > preserved from initramfs to normal init (I don't fully understand what > is happening here, so maybe it does not apply to Arch). > >> I was thinking with regard to mdadm now: Maybe mdadm stores some >> valuable data there. > > They certainly store something in /run, but I don't know what happens > if we throw it away at the end of initramfs. > >>From all the discussions on this topic I really got the impression > that /run is supposed to be created in the initramfs and then > preserved until shutdown. Maybe it is worth having a look at what > dracut is doing?
We can do that easily (identical as the /proc, /sys, /dev stuff). However, prepare to run into problems when the initramfs udev version does not match the version in the system.
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