Re: Can't install GRUB

[Paolo]

On Mon, 5 Nov 2012, Paolo wrote:

> From: Chris Murphy
> Subject: Re: Can't install GRUB
> Date: Mon, 5 Nov 2012 19:34:39 +0100
>
> >  The file /boot/grub/stage1 not read correctly.
>
> You're better off trying to get support for GRUB Legacy on the CentOS forums
> than here, because here only GRUB2 is supported.

Sorry.
For the archive: I solved my problem using a workaround. Done a manual 
partitioning of the disks (instead of the graphical wizard), so I can 
force /boot to be the first partition. 
This seems solve the problem (cylinder like old LILO's times?)


> >    Device Boot      Start         End      Blocks   Id  System
> >  /dev/sdb1               1      130542  1048576000   fd  Linux raid
> >  autodetect
> >
> >    Device Boot      Start         End      Blocks   Id  System
> >  /dev/sda1               1      130542  1048576000   fd  Linux raid
> >  autodetect
>
> In your partition scheme you've provided not a single sector for grub to
> install into, it would seem. Normally there is at least 63 sectors of gap
> between the MBR and the start of the first partition, into which most of GRUB
> goes.

Just for my culture (if not too OT), My current partition schema is:

Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/md1              66063436   2507340  60200176   4% /
tmpfs                  1961908         0   1961908   0% /dev/shm
/dev/md0                233321     55309    165966  25% /boot
/dev/md2             980486564    204360 930474740   1% /home


Disk /dev/sda: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x0003e650

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          30      240943+  fd  Linux raid
autodetect
Partition 1 does not start on physical sector boundary.
/dev/sda2              31        8386    67119569   fd  Linux raid
autodetect
Partition 2 does not start on physical sector boundary.
/dev/sda3            8386      132401   996150488   fd  Linux raid
autodetect



I manually tried various values of Start/End sector to eliminate the 
"Partition N does not start on physical sector boundary." warning.

How can I calculate the right values?

and .. is this a real problem for a working system (performance or other 
problems)?

Thanks, P.