boot from external HDD/hub

[thradtke]

Is it possible to boot an OS from a hard disk connected via external hub? I've installed Raspbian but booting stops with a notification that /dev/sda1 isn't found. Is there anything I can do about it?

Thanks!

[Lob0426]

Yes it works just fine for me.
One thing to try is /sda2 or just /sda

Make sure you have this in cmdline.txt and that there is a space before and after it. You should have changed it from "/dev/mmcblk0p2" to "/dev/sda1"

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root=/dev/sda1

Make sure you have the right rootfs type stated in cmdline.txt also.

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rootfstype=ext4

[thradtke]

Yes it works just fine for me.
One thing to try is /sda2 or just /sda

I've created partitions 1 (ext4) and 2 (swap), but I'll try sda tonight.

Make sure you have this in cmdline.txt and that there is a space before and after it. You should have changed it from "/dev/mmcblk0p2" to "/dev/sda1"

I started out with no cmdline.txt at all and had to create it with this single line you quoted, but it appears the systems identifies correctly what I want as it complains about exactly the /dev/sda1 device I stated there. At least, I hope I understand what's going on .

Make sure you have the right rootfs type stated in cmdline.txt also.

Code: Select all

rootfstype=ext4

Ah, that's promising. I'll try your suggestions tonight. Thanks!

[RaTTuS]

http://www.raspberrypi.org/phpBB3/viewt ... 3&p=122743 - read the thread
http://www.raspberrypi.org/phpBB3/viewt ... fs#p122476 <- plus the small typo I made and fixed in a later post

[thradtke]

Specifying the fs and/or changing sda1 to sda had it all ended up with that nice rainbow screen. boot_delay=1000 and rootdelay=30 did apparently nothing. In no time, I had the screen full of text and still it is reported that /dev/sda1 isn't found.

Powering up all at the same time or having hub and usb HDD powered first than Pi made no difference.

Back without cmdline.txt, Raspbian boots just fine from SD and the USB HDD is accessible at /dev/sda1.

I'm lost here (again).

[thradtke]

Whoops ... it wasn't patient enough. After some time, the rainbow screen went away and fun started .

Well, it now complains about the swap partition apparently have holes, but I'll try to resolve it myself. At least one thing I should do myself .

Thanks guys, you are great!

[thradtke]

Deinstalled swapfile, removed dphys-swap symlink, created swap partition entry in fstab - solved.

Ha!