on 5/30/00 6:52 PM, Michael wrote:
>> this brings me back to my original post in this thread. I get an
>> error when I try to specify the "real" device and the MBR does not
>> get written. do I have to stop the raid for the boot partition and
>> mount the partitions as individual sdx ? I would think that if I
>> tell lilo to write the MBR to a raid 1 that it would end up on both
>> disks in the array.
>
> real lilo does not know about or understand raid devices. I don't
> know exactly what the redhat lilo patch does, but I bet it makes some
> assumptions about geometry and what you wish to do when a disk fails
> and must be rebooted -- i.e. whether or not you want the disk to boot
> from the existing bios position or if you will move it -- very mbrd
> dependent.
>
> using stock lilo, you can write it anyway you want.
> lilo does not care if the disk is mounted or not, it will write to
> the mbr of the specified drive "period" whether it is in a raid array
> or whether it is mounted is not an issue.
>
>snip..
>
> The boot requirements on most require that the boot drive be bios 80
> which implies that the "D:" (bios 81) drive must be move to achieve
> boot if the "C:" (bios 80) drive fails -- a few motherboards will
> boot from the alternate drive -- usually I don't guess, just provide
> a boot floppy that mounts the md device and does not care if C or D
> is present (automount) so in the event of drive failure, if a reboot
> is necessary then the diskette can be used.
>
>>
>> my original post:
>>
>>> Hi, I have a raid level 1 on 2 scsi drives and an IDE drive.
>
> used to be you could not mix scsi and ide in raid -- don't know about
> the current code -- might ask the list guru's
thanks,
lots of good info. you pointed me in the right direction and I figgured it
out.
I had another look at your how-to and found I was missing a line:
start=63
hence my error message
works fine now.
the ide is not part of the raid but it is the first drive the hardware sees
when it boots. when I pull it out of the machine the system went looking for
a network boot server.
I changed a setting in the bios to allow it to boot from the scsi drive.
I powered down, pulled the power cord from the IDE drive and it found the
MBR on the scsi drive and came up like it should - booted everything from
the raid1. the only problem is I have entries in the fstab for hda
partitions so it dropped me into repair mode. Can I set the hda partitions
to automount or something so it won't freak if the drive isn't there but
will mount them if it is?
the IDE drive is just for incidental things and some archived files.
Gavin
