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initramfs does not assemble raid arrays
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NTPT
n00b
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Joined: 22 Mar 2005
Posts: 17

PostPosted: Wed Nov 18, 2015 3:59 pm    Post subject: initramfs does not assemble raid arrays Reply with quote

Hi, All.

I have a problem with GENTOO installed on UEFI machine (uefi boot)

I have /dev/sda1 as efi partition with vfat , mounted on /boot/efi

I have /dev/md2 md3 md4 md5 raid1 arrays with 1.2 metadata /boot swap / and /home

mdadm devices mdadm --scan --detail /etc/mdadm.conf

I create a ramdisk via genkernel --mdadm --mdadm-config=/dev/mdadm.conf --install initramfs

I also add mdraid1x grub2 module and "domdadm" in grub config kernel commandline in /etc/default/grub and regenerat grub2 config


result: Could not find root block device UUID=bla
Investigating found that there are no raid devices at all
Hovever if I manually assemble raid devices ie mdadm --asemble /dev/md2 md3 md4 md5 etc and ctrl+d
enviroment find the root and system boots

I am complettly confused and have no idea where to find an error. I suppose ti is a ramdisk job to load modules and then assemble a raid devices before switching to real root.
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szatox
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Joined: 27 Aug 2013
Posts: 1746

PostPosted: Wed Nov 18, 2015 4:43 pm    Post subject: Reply with quote

And what boot options do you provide?
Those are must-have:
root=/dev/ram0 ramdisk=8192 real_root=/path/to/root/device
Not sure about dolvm, however I build my initramfs with lvm (leaving mdadm with defaults) and it assembles raid and then enables lvm on top of it.
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