How to Install Gentoo on Mobile Disk

friddle · n00b Joined: 14 May 2013 Posts: 4

First of all.I am a Chinese student.please forgive my poor english.I do my best to express the Question Clearly

I have some error information with this probliem vfs cannot open root device gentoo
https://forums.gentoo.org/viewtopic-t-465985-highlight-unknownblock+0+0.html

But i am not use the sata raid.i just want to install gentoo on my mobile disk.
i use the genkernel to compile the kernel.
i do not install the grub.because i already install the Ubuntu.i type update-grub on my ubuntu system.it work.it can find the gentoo Linux
but when i reboot it.but failed.
The Error Message:
VFS: cannot open root device "/dev/sdb6" ..and tell me to reset the root.
So I change the Grub.cfg on My Ubuntu boot option
i change this line:
before: linux /boot/kernel-genkernel-x86-3.9.2-gentoo root=/dev/sdb7
after： linux /boot/kernel-genkernel-x86-3.9.2-gentoo root=UUID=0c38c109-4371-4dc6-842c-f7b685c6cffe (ps:i am pretty sure the UUID is right,i do it )
but when i reboot .i meet the other Error Message:
can't find this UUID Disk

but it provide shell.
when i type "ls /dev" i fount the folder /dev only contain sda[1-10],miss the Mobile disk devices sdb.

I want to figure out what mistake i made.Is i miss something when I Compile kernel or I have to made some Config change
Is anyone install Gentoo on Mobile Disk!please help me.

sincerely friddle

hielvc · Posted: Tue May 14, 2013 2:32 am Post subject:

Post your fstab .
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friddle · n00b Joined: 14 May 2013 Posts: 4

hielvc · Posted: Tue May 14, 2013 3:05 am Post subject:

you need to edit it. See the install guides. The quick guide is shorter use it.
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Ant P. · Watchman Joined: 18 Apr 2009 Posts: 6920

For reference, the "quick guide" mentioned above is this page (zh-cn language version here)

friddle · n00b Joined: 14 May 2013 Posts: 4

NeddySeagoon · Posted: Tue May 14, 2013 2:33 pm Post subject:

friddle,

Is your mobile disk connected by USB?

Normally, the USB system is not started until after root is mounted. Thats a problem if root is on USB.
Add rootdelay=7 to the kernel line in grub.cfg. This allows 7 seconds for USB to start before root is mounted.
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Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.