I'm about to move a fully functional system from a box with ONE IDE drive to a box with TWO IDE drives configured as RAID-1 (mirror) via Linux software. Any ideas on how I can do that? Normally a disk to disk would be to use dd if=/dev/hda of=/dev/hdb, but that wouldn't work here I guess..
Anders Norrbring wrote:
I'm about to move a fully functional system from a box with ONE IDE drive to a box with TWO IDE drives configured as RAID-1 (mirror) via Linux software.
Any ideas on how I can do that? Normally a disk to disk would be to use dd if=/dev/hda of=/dev/hdb, but that wouldn't work here I guess..
Hi Anders, I want to do the same but have the problem that I don't want to move to another box but just use the second drive (now for backups only) with the first one (system hdisc) as a raid 1. Don't have the time at the moment) My first though was 1. stopping te system 2. booting from a CD 3. make fullbackup (tar) 4. creating the raid (the info on the discs will be destroyed) 5. recovering from the backup 6. additional steps - making system bootable again I have no idea if that would work like that. I have doubts about the additional steps. Don't know what would be necessary do make the system boot again. Maybe someone can give a hint on that. Ulf
Sorry this might sound a bit daft but why not take the disk into the new machine, boot up add it into fstab and copy the files into the other drives? the soft raid should sort out the rest for you. On Thursday 22 September 2005 10:37, Anders Norrbring wrote:
I'm about to move a fully functional system from a box with ONE IDE drive to a box with TWO IDE drives configured as RAID-1 (mirror) via Linux software.
Any ideas on how I can do that? Normally a disk to disk would be to use dd if=/dev/hda of=/dev/hdb, but that wouldn't work here I guess..
-- Kind regards Per Qvindesland E-mail: per@qvtech.cc Web: www.qvtech.cc
Anders Norrbring wrote:
I'm about to move a fully functional system from a box with ONE IDE drive to a box with TWO IDE drives configured as RAID-1 (mirror) via Linux software.
Any ideas on how I can do that? Normally a disk to disk would be to use dd if=/dev/hda of=/dev/hdb, but that wouldn't work here I guess..
You could use "cp -a" to copy the data over, though you'd have to set up a new install first.
On Thursday 22 September 2005 04:37 am, Anders Norrbring wrote:
I'm about to move a fully functional system from a box with ONE IDE drive to a box with TWO IDE drives configured as RAID-1 (mirror) via Linux software.
Any ideas on how I can do that? Normally a disk to disk would be to use dd if=/dev/hda of=/dev/hdb, but that wouldn't work here I guess..
This is from a post I made some time back. Also, do a search for "Software Raid and Grub HOW-TO". That and http://www.linux.com/howtos/Boot+Root+Raid+LILO-4.shtml were the what got me started: I have done this many times and have posted some instructions to this list. I'm not at home right now, but basically: Install your new disk and reboot. Use fdisk to partition the new disk just like the old disk I create "broken" raid device(s) from hdb with an /etc/raidtab like this: raiddev /dev/md0 raid-level 1 nr-raid-disks 2 nr-spare-disks 0 persistent-superblock 1 device /dev/hda1 failed-disk 0 device /dev/hdb1 raid-disk 1 Add more sections to the file for each partition you want to mirror. Then mkraid /dev/md0 (and any others) and format them. Mount the new device(s) somewhere and copy to them using "cp -a". Don't copy /proc or the mount point for the new raid device. Just create the directories. Modify fstab *on the new raid device*. Create an entry in grub on *both* devices to boot it. If everything boots OK use raidhotadd to to make hda2 part of the raid system (this is the point of no return). Then use grub: grub Grub>device (hd0) /dev/hda Grub>root (hd0,0) and then: Grub>setup (hd0) Grub>device (hd0) /dev/hdb Grub>root (hd0,0) and then: Grub>setup (hd0) quit This has worked for me on several machines. I hope it helps you out. -- Louis Richards
participants (5)
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Anders Norrbring -
James Knott -
Louis Richards -
Per Qvindesland -
Ulf Rasch