This is something I've been trying to do for some time and there are 2
older threads, but the last post got no responce, so starting a new
thread. The old ones are:
Converting system to raid
Removing drives
The computer with 2 sata drives switched over fine a long time ago, but
I have yet to get the one with 3 sata drives to boot with raid. Raid
support is built into the kernel, partitions are type fd.
fdisk -l shows:
-----------------------------------------------------------------------
Disk /dev/hda: 40.0 GB, 40020664320 bytes
255 heads, 63 sectors/track, 4865 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x6b381dfe
Device Boot Start End Blocks Id System
/dev/hda1 * 1 4660 37431418+ 83 Linux
/dev/hda2 4661 4865 1646662+ 5 Extended
/dev/hda5 4661 4865 1646631 82 Linux swap / Solaris
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x94140963
Device Boot Start End Blocks Id System
/dev/sda1 * 1 3040 24418768+ fd Linux raid
autodetect
/dev/sda2 3041 3649 4891792+ fd Linux raid
autodetect
/dev/sda3 3650 60801 459073440 fd Linux raid
autodetect
Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xf1814421
Device Boot Start End Blocks Id System
/dev/sdb1 * 1 3040 24418768+ fd Linux raid
autodetect
/dev/sdb2 3041 3649 4891792+ fd Linux raid
autodetect
/dev/sdb3 3650 60801 459073440 fd Linux raid
autodetect
Disk /dev/sdc: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x371b6063
Device Boot Start End Blocks Id System
/dev/sdc3 3650 60801 459073440 fd Linux raid
autodetect
Disk /dev/md0: 25.0 GB, 25004736512 bytes
2 heads, 4 sectors/track, 6104672 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk identifier: 0x00000000
Disk /dev/md0 doesn't contain a valid partition table
Disk /dev/md2: 940.1 GB, 940182208512 bytes
2 heads, 4 sectors/track, 229536672 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk identifier: 0x00000000
Disk /dev/md2 doesn't contain a valid partition table
Disk /dev/md1: 5009 MB, 5009113088 bytes
2 heads, 4 sectors/track, 1222928 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk identifier: 0x00000000
Disk /dev/md1 doesn't contain a valid partition table
-----------------------------------------------------------------------
Orginaly I had made both md0 and md1 2-way mirrors with a spare. But
when it wouldn't boot, I was told it might be because of the spare and
to grow them in. That also didn't work. I change md0 and md1 to 2-way
mirrors, and removed the boot flag for sdc1 and zeroed superblock And I
corrected the mdadm.conf file to reflect the changes to md0/1. Still
would not boot from raid. I removed the two partitions sdc1 and sdc2
leaving just sdc3 which is part of md2 raid5. Also re-ran grub on md0
using:
sudo grub
grub>device (hd0) /dev/sda
grub>root (hd0,0)
grub>setup (hd0)
grub>device (hd0) /dev/sdb
grub>root (hd0,0)
grub>setup (hd0)
To copy the current boot drive hda1 over to md0, I use a GRML boot disk,
mount /dev/md0 to /mnt/md0 and /dev/sdd1 (/dev/hda1) to /mnt/sdd1, then do:
rsync -caHh --progress --delete /mnt/sdd1/ /mnt/md0.
Then I reboot normally. I have 2 copies of /boot/grub/device.map,
/boot/grub/menu.lst and /etc/fstab. one for normal boot and one for
raid. On /mnt/md0 I swap the normal boot files for the raid files by
adding .old to the names of normal boot and removing .raid from the raid
versions. Then reboot again and in cmos move the pata drive to the
bottom of the list so cmos tries the sata drives first. That worked for
the 32bit linux 2 drive system. But on this 64bit 3 drive I get:
Grub loading stage 1.5
Grub loading, please wait
Error 2
I can't remove the 3rd drive because it has part of md2 and I shouldn't
need to anyway. Copies of the above mentioned files I put at:
http://24.255.17.209:2400/vdr/local/raid/
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