I'm currently running my linux system off a single drive, /dev/sda The drive's starting to act up a bit. I intend to replace it with a new 2-drive RAID-1 array. I'm trying to -- migrate everything from the current single-drive to the array -- modify the grub entries correctly -- switch to booting from the array I get as far as the 'switch' to booting from the array instead of the single drive. Booting from the array, the system gets to "No Boot Device found. and halts. I supsect I've missed something simple/obvious. Here's what I've done: The single/current drive's partitioned as: /dev/sda1 1G ext4 "/boot" /dev/sda2 * lvm /dev/VG0/lvROOT * ext4 "/" Its grub boot entry is: title Main root (hd0,0) kernel /vmlinuz root=/dev/VG0/LVROOT rootfstype=ext4 rootflags=journal_checksum noresume initrd /initrd To prepare the array, I (1) Identically formatted the two new drives, /dev/sdb & /dev/sdc, for RAID use, making sure the 'bootable' flag is set on the 1st partition: fdisk -u -c -l /dev/sd[bc] Disk /dev/sdb: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x4170c717 Device Boot Start End Blocks Id System /dev/sdb1 * 2048 2099199 1048576 fd Linux raid autodetect /dev/sdb2 2099200 976773167 487336984 fd Linux raid autodetect Disk /dev/sdc: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x76a841ea Device Boot Start End Blocks Id System /dev/sdc1 * 2048 2099199 1048576 fd Linux raid autodetect /dev/sdc2 2099200 976773167 487336984 fd Linux raid autodetect (2) Created the RAID arrays mdadm --create /dev/md0 --name=md0 --homehost=cattail \ --level=raid1 --raid-devices=2 --metadata=0.90 \ --verbose --bitmap=internal \ /dev/sdb1 /dev/sdc1 mdadm --create /dev/md1 --name=md1 --homehost=cattail \ --level=raid1 --raid-devices=2 --metadata=1.2 \ --verbose --bitmap=internal \ /dev/sdb2 /dev/sdc2 (3) Waited until they're synced cat /proc/mdstat ... Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [linear] md1 : active raid1 sdc2[1] sdb2[0] 487335824 blocks super 1.2 [2/2] [UU] bitmap: 0/4 pages [0KB], 65536KB chunk md0 : active raid1 sdc1[1] sdb1[0] 1048512 blocks [2/2] [UU] bitmap: 0/1 pages [0KB], 65536KB chunk unused devices: <none> (4) Formatted the RAID partitions mkfs.ext4 -v -L BOOT /dev/md0 pvcreate -ff --metadatacopies 2 /dev/md1 vgcreate -v -s 32M VG1 /dev/md1 lvcreate -L 100% -n LVROOT /dev/VG1 vgchange -ay mkfs.ext4 -v /dev/VG1/LVROOT (5) mounted the RAID partitions mkdir -p /mnt/migrate/BOOT mkdir -p /mnt/migrate/LVROOT mount /dev/md0 /mnt/migrate_temp/BOOT mount /dev/VG1/LVROOT /mnt/migrate/LVROOT (6) synced the current drive to the new array rsync -xavH -z --compress-level=1 /boot/* /mnt/migrate/BOOT rsync -xavH -z --compress-level=1 / /mnt/migrate/LVROOT (7) got the UUID of the array '/boot' partition tune2fs -l /dev/md0 | grep UUID Filesystem UUID: 1d2d9f26-b3b4-4561-a2de-b6e3fe6bb065 (8) modified the /etc/fstab on the array so it boots from the array cat /mnt/migrate/LVROOT/etc/fstab UUID=1d2d9f26-b3b4-4561-a2de-b6e3fe6bb065 /boot ext4 noatime,acl,user_xattr,barrier=1 1 2 /dev/VG1/LVROOT / ext4 noatime,acl,user_xattr,journal_checksum,barrier=1 1 1 proc /proc proc defaults 0 0 sysfs /sys sysfs noauto 0 0 debugfs /sys/kernel/debug debugfs noauto 0 0 devpts /dev/pts devpts mode=0620,gid=5 0 0 none /tmp tmpfs nosuid,nodev,size=1024m 1 2 (9) modified /boot/grub/menu.lst on BOTH the local drive and the array cat /boot/grub/menu.lst cat /mnt/migrate/BOOT/grub/menu.lst ... title Main root (hd0,0) kernel /vmlinuz root=/dev/VG0/LVROOT rootfstype=ext4 rootflags=journal_checksum noresume initrd /initrd title Array1 root (hd1,0) kernel /vmlinuz root=/dev/VG1/LVROOT rootfstype=ext4 rootflags=journal_checksum noresume initrd /initrd title Array2 root (hd2,0) kernel /vmlinuz root=/dev/VG1/LVROOT rootfstype=ext4 rootflags=journal_checksum noresume initrd /initrd ... (10) Identified the drive aliases cd /dev/disk/by-id/ ls -al \ ata-ST3500418AS_9RYC7TD8 \ ata-ST3500418AS_9ODK9DH6 \ ata-ST3500418AS_9VKF6MF4 lrwxrwxrwx 1 root root 9 Aug 3 13:11 ata-ST3500418AS_9RYC7TD8 -> ../../sda lrwxrwxrwx 1 root root 9 Aug 3 13:11 ata-ST3500418AS_9ODK9DH6 -> ../../sdb lrwxrwxrwx 1 root root 9 Aug 3 13:11 ata-ST3500418AS_9VKF6MF4 -> ../../sdc (11) updated /boot/grub/device.map on the current/active drive cat /boot/grub/device.map (hd0) /dev/disk/by-id/ata-ST3500418AS_9RYC7TD8 (hd1) /dev/disk/by-id/ata-ST3500418AS_9ODK9DH6 (hd2) /dev/disk/by-id/ata-ST3500418AS_9VKF6MF4 (12) setup a grub batch file cat /etc/grub.conf setup --stage2=/boot/grub/stage2 --force-lba (hd0) (hd0,0) setup --stage2=/boot/grub/stage2 --force-lba (hd1) (hd1,0) setup --stage2=/boot/grub/stage2 --force-lba (hd2) (hd2,0) quit (13) wrote updated info to the boot record of all three drives grub --batch --device-map=/boot/grub/device.map < /etc/grub.conf At this point, if I reboot from the "Main" grub record, everything still works. But, if I reboot from either "Array1" or "Array2", the system gets as far as "No Boot Device found. and just sits. As I said -- I suspect I've missed or misconfigured something simple/obvious. Any suggestions as to what? -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
