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  1. I ran into this problem when upgrading ZFS from 0.6.5 to 0.7.5. I resolved it with brute force. When you run genkernel initramfs, it generates this warning: * WARNING... WARNING... WARNING... * Additional kernel cmdline arguments that *may* be required to boot properly... * add "dozfs" for ZFS volume management support * add either "real_root=ZFS" (bootfs autodetection) or "real_root=ZFS=<dataset>" to boot from a ZFS dataset I heeded this warning and in /etc/default/grub I changed it from: GRUB_CMDLINE_LINUX="dozfs real_root=ZFS=rpool/ROOT/funtoo" to: GRUB_CMDLINE_LINUX="dozfs real_root=ZFS" Also worth noting is that I only ran into this problem on my server, which runs ZFS with mirrored VDEVs. I had initially created the server pool with the following command: root@ubuntu:~# zpool create -f -o ashift=12 -o cachefile=/tmp/zpool.cache -O normalization=formD -O atime=off -m none -R /mnt/funtoo rpool mirror /dev/disk/by-id/foo /dev/disk/by-id/foo mirror /dev/disk/by-id/foo /dev/disk/by-id/foo My desktop computer, which runs a single disk pool as described in the ZFS install guide, was able to update ZFS successfully, without having to change it to bootfs autodetection. I am not sure if this is a regression with GRUB or ZFS, but these were my observations. Try it out and see if it resolves the problem for you.
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