Hi, I'm currently experimenting with software RAID1 on a spare PC with two 40 GB hard disks. Normally, on a desktop PC with only one hard disk, I have a very simple partitioning scheme like this : /dev/hda1 80 MB /boot ext2 /dev/hda2 1 GB swap /dev/hda3 39 GB / ext3 Here's what I'd like to do. Partition a second hard disk (say, /dev/hdb) with three partitions. Setup RAID1 like this : /dev/md0 80 MB /boot ext2 /dev/md1 1 GB swap /dev/md2 39 GB / ext3 I somehow managed to get this far. Here's what I have : [root at raymonde ~]# fdisk -l /dev/hda Disk /dev/hda: 41.1 GB, 41110142976 bytes 255 heads, 63 sectors/track, 4998 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/hda1 * 1 11 88326 fd Linux raid autodetect /dev/hda2 12 134 987997+ fd Linux raid autodetect /dev/hda3 135 4998 39070080 fd Linux raid autodetect [root at raymonde ~]# fdisk -l /dev/hdb Disk /dev/hdb: 41.1 GB, 41110142976 bytes 16 heads, 63 sectors/track, 79656 cylinders Units = cylinders of 1008 * 512 = 516096 bytes Device Boot Start End Blocks Id System /dev/hdb1 * 1 156 78592+ fd Linux raid autodetect /dev/hdb2 157 2095 977256 fd Linux raid autodetect /dev/hdb3 2096 79656 39090744 fd Linux raid autodetect During install, my /dev/md1 and /dev/md2 got somehow mixed up, which doesn't really matter : [root at raymonde ~]# cat /etc/fstab /dev/md1 / ext3 defaults 1 1 /dev/md0 /boot ext2 defaults 1 2 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 /dev/md2 swap swap defaults 0 0 I wasn't sure where to install GRUB, so I chose /dev/md0. I was wondering if this setup theoretically enabled me to continue working with one disk failure. So I tried unplugging the power cord of one of my hard disks... which resulted in a "GRUB Disk Error" on boot. Question : is there a way to still run the system with either of the two disks "damaged" (in this case : unplugged)? And if so, how would I have to go about it in my setup? Cheers from the freezing South of France, Niki