Re: GRUB and support for Virtio

[Daniel Bareiro <daniel-listas@gmx.net>]

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On Wednesday, 18 August 2010 21:45:56 +0300,
Nikolai K. Bochev wrote:

> Strange, i did 2 clean installs of centos 5.5 on an ubuntu 9.10 host
> and it went flawless with virtio devices ( both disks and network ).

It appears that Debian have the same problem. In the installation of
both Debian Lenny and CentOS 5.5, I had no problems, but appear later
using 'setup' and 'root':

-----------------------------------------------------------------------
debian-test8:~# fdisk -l /dev/vda

Disco /dev/vda: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cilindros of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000b7998

Disposit. Inicio    Comienzo      Fin      Bloques  Id  Sistema
/dev/vda1               1         122      979933+  82  Linux swap / Solaris
/dev/vda2             123        1305     9502447+  83  Linux
debian-test8:~#
debian-test8:~#
debian-test8:~# grub
Probing devices to guess BIOS drives. This may take a long time.


    GNU GRUB  version 0.97  (640K lower / 3072K upper memory)

       [ Minimal BASH-like line editing is supported.   For
         the   first   word,  TAB  lists  possible  command
         completions.  Anywhere else TAB lists the possible
         completions of a device/filename. ]
grub> root (hd0,1)
root (hd0,1)

Error 21: Selected disk does not exist
grub>

grub> setup (hd0)

Error 12: Invalid device requested
-----------------------------------------------------------------------

But invoking GRUB with this file, it does recognize the disk:

-----------------------------------------------------------------------
debian-test8:~# cat /boot/grub/device.map
(hd0)   /dev/vda

debian-test8:~# grub --device-map=/boot/grub/device.map


    GNU GRUB  version 0.97  (640K lower / 3072K upper memory)

       [ Minimal BASH-like line editing is supported.   For
         the   first   word,  TAB  lists  possible  command
         completions.  Anywhere else TAB lists the possible
         completions of a device/filename. ]
grub> root (hd0,1)
root (hd0,1)
 Filesystem type is ext2fs, partition type 0x83
grub> setup (hd0)
setup (hd0)
 Checking if "/boot/grub/stage1" exists... yes
 Checking if "/boot/grub/stage2" exists... yes
 Checking if "/boot/grub/e2fs_stage1_5" exists... yes
 Running "embed /boot/grub/e2fs_stage1_5 (hd0)"...  17 sectors are embedded.
succeeded
 Running "install /boot/grub/stage1 (hd0) (hd0)1+17 p (hd0,1)/boot/grub/stage2
/boot/grub/menu.lst"... succeeded
Done.
-----------------------------------------------------------------------

However, in installations made on IDE disks, it is not necessary to do
this. What could be causing this difference?


Thanks for your replies.

Regards,
Daniel
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