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?
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