On Tue, 2007-12-18 at 16:52 -0500, pham_cuong@emc.com wrote: > There is a difference between changing the boot order from the BIOS vs. > [physically] removing the master HD. Here's why: > > In the former case, the BIOS boot order is at the lower-level (earlier) > and it will take effect before the boot loader exists in each drive. > Depending on your BIOS, the boot order can be fixed or priority-based > (most BIOSes support priority-based boot path). Fixed order means that > only the specified boot order is used. Priority-based boot order means > that the system will attempt the first boot path on the list, if failed, > or timed out, goes to the 2nd boot path. BIOS boot order only changes > the order of which path to boot from first. It has no control over the > designation of which drive is detected and designated as drive 0 or > drive 1. Boot.ini has this level of granularity, and more... Down to > the partition level (one below the disk level). > > The act of removing the Master HD changes the HD designation at the > hardware level, and this in turn may affect how the system boots (for > non-SCSI only). Specifically, for your case the XP's boot.ini may > designate that XP is to be booted from the first disk (connected to > PR1), first paritition, and you've physically connect this drive as a > secondary/slave (SL) drive so XP will never boot when XP's boot loader > reads the boot.ini. Upon either moving this drive to the primary (PR1) > connection, or change the boot.ini, the drive order for this drive is > changed from disk1 to disk0, so XP would see this drive and be able to > boot from it. As you can see, in this case, changing the BIOS boot > order is inconsequential. > > Regards, > > Confucius useful stuff but I'm still unsure why if I change the order in BIOS then (when I had it working a bit) it would start the XP boot sequence (and not the GRUB from master) but then hang indefinitely... _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
