On Fri, 2006-06-09 at 10:10 -0500, Les Mikesell wrote: > On Fri, 2006-06-09 at 22:58 +0800, Feizhou wrote: > > > I just looked at the boot sector on the 3 machines that I have running > > > software raid1. It looks like the installer got it right on all 3. > > > IIRC, one was installed as CentOS 4.1, another as 4.2, and another as 4.3. > > > > The installer will install grub. Just not properly. If the first disk > > dies, when the box comes up, the previous second disk grub stage 1 will > > load but it will not look for the stage 2 on the current disk and > > therefore fail. > > That will depend on what your bios does when the first drive fails and > whether you've had to move it to make it boot at all. On the scsi > systems where I've used it, the 2nd drive will boot and everything > on the cable shifts up if the first drive fails or is removed. > IDE systems are different - and normally won't boot if a failed drive > is still connected. If the BIOS is able to get around the failed drive, HD device IDs are shifted: 0x81->0x80, 0x82->0x82, ... Ditto if you tell BIOS to boot from D:, E:, ... and IDs "wrap" if needed: 0x83->0x80, 0x80->0x81... And if from other device(s), somewhat similar, but different, adjustments *may* occur, e.g. El Torito Spec Boot CD (Phoenix Bios/IBM circa 1995?). -- Bill
Attachment:
signature.asc
Description: This is a digitally signed message part
_______________________________________________ CentOS mailing list CentOS@xxxxxxxxxx http://lists.centos.org/mailman/listinfo/centos
