Posts Tagged ‘linux’

unable to mount root fs on unknown-block(0,0)

Sunday, January 31st, 2010

After building a system for the new backup servers that utilized an Adaptec 31205 controller, I always prefer to use a kernel that we’ve tuned inhouse.

Upon booting into the kernel I had built, I received:

unable to mount root fs on unknown-block(0,0)

Since the drive size on the array was very large, the Debian Installer automatically created an EFI GUID Partition table, which my kernel was not set up for.

In the kernel makemenu, File Systems, Partition Types, enable Advanced partition selection. Near the bottom is EFI GUID Partition support. Enable that, recompile your kernel and you should be set.

One reboot later and voila:

st1:/colobk1# uname -a
Linux st1 #1 SMP Fri Jan 29 21:43:32 EST 2010 x86_64 GNU/Linux
st1:/colobk1# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1             462M  232M  207M  53% /
tmpfs                 2.0G     0  2.0G   0% /lib/init/rw
udev                   10M   60K   10M   1% /dev
tmpfs                 2.0G     0  2.0G   0% /dev/shm
/dev/sda8              19T  305G   18T   2% /colobk1
/dev/sda5             1.9G   55M  1.8G   3% /home
/dev/sda4             949M  4.2M  945M   1% /tmp
/dev/sda6             2.4G  204M  2.2G   9% /usr
/dev/sda7             9.4G  237M  9.1G   3% /var

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