[CentOS] After install centos does not find hardrives (SATA)
Nathan
lists at netdigix.com
Fri Feb 17 16:29:33 UTC 2006
actually its dosnt even make it to Grub, its the EMI menu on Intel servers...
so I guess it cannot even find a proper boot device.. ill have to do more
research on the issue. if you have any ideas why that would also be great help.
thanks alot,
Quoting Aleksandar Milivojevic <alex at milivojevic.org>:
> Quoting Nathan <lists at netdigix.com>:
>
> > no its the prompt centos goes to when it cannot find anything to boot to.
>
> So it's the grub prompt most likely. If it is, then your boot
> partition is either too large and part of it falls outside of BIOS
> addressable disk space (first 1024 cylinders), or is not positioned
> inside BIOS addressable disk space (basically, same thing). Grub can
> access disk drives only using BIOS calls. It needs to be able to
> access files in /boot/grub directory, as well as kernel and initrd
> images in /boot directory. All those files *must* be in BIOS
> addressable range, or booting will fail. Fdisk will issue a warning
> describing this for disks with more than 1024 cylinders.
> Unfortunately, you won't get such warning during graphical install.
> Grub isn't really verbose about this either (it just drops to CLI,
> without telling user where the problem is).
>
> You can easily check if what I just described is the problem you are
> having. Boot from CD into rescue mode. Invoke fdisk and print out
> partition table. The start and end cylinder of partition that holds
> /boot directory must be bellow 1024. If they are not, you are in
> trouble.
>
> If this is the problem you are having, the easiest way is to reinstall
> with above limitations in mind. Common way of dealing with this BIOS
> limitation is to create separate partition for /boot, and to make sure
> entire partition used for /boot is inside first 1024 cylinders. For
> example, by making /boot be first partition on the disk, and having it
> relatively small (100MB is more than enough for this partition). This
> is limitation of the BIOS, nothing to do with CentOS (any other
> operating system).
>
>
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Thanks
- Nathan
- http://www.netdigix.com
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