icycle> I looked through all of the archives on this list as well as google icycle> searching for help. I want to make sure that GRUB supports installation icycle> on RAID1 (mirror) units. I have seen several methods to do this: Well, on a Red Hat system I have here, this works fine: #boot=/dev/sda default=0 timeout=10 #splashimage=(hd0,0)/grub/splash.xpm.gz title Red Hat Linux (2.4.9-34enterprise) root (hd0,0) kernel /vmlinuz-2.4.9-34enterprise ro root=/dev/md3 console=ttyS0,9600n8 initrd /initrd-2.4.9-34enterprise.img There are multiple RAID1 partitions on two disks, and grub is installed to /dev/sda. I don't believe grub is mirrored across disks, though. Since software RAID on Linux works partition-by-partition, and not on whole disks, I don't see how you could automatically mirror the MBR across disks. You could install grub to multiple MBR's, though, one for each disk. It wouldn't gain you anything unless your BIOS can boot from the other disks, though. -- Charles R. Anderson <cra@wpi.edu> / http://angus.ind.wpi.edu/~cra/ PGP Key ID: 49BB5886 Fingerprint: EBA3 A106 7C93 FA07 8E15 3AC2 C367 A0F9 49BB 5886