----- Original Message -----
From: "Joe Morris (NTM)" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Saturday, July 07, 2007 5:40 PM
Subject: Re: [opensuse] Software RAID with existing drive
On 07/08/2007 07:49 AM, Brandon Carl wrote:
Device: /dev/hda
Size: 232.8 Gb
F:
Type: ST3250623A
Mount:
Mount By:
Start: 0
End: 30400
Used By: RAID sli_ahahafdeeibj
Label:
Device ID: ata-ST3250623A_4ND4WY67
Device Path: pci-0000:00:0f.0-ide-0:0
Device: /dev/hdb
Size: 232.8 Gb
F:
Type: WDC-WD2500jB-00REA0
Mount:
Mount By:
Start: 0
End: 30400
Used By: RAID sli_ahahafdeeibj
Label:
Device ID: ata-WDC_WD2500jB-00REA0_WD-WMANK5725185
Device Path: pci-0000:00:0f.0-ide-0:1
The /dev/hda is the hard drive that openSUSE is currently installed on.
The /dev/hdb is the new hard drive I would like to use as a mirror.
I would like to have the entire system mirrored, but I only require
the /home to be mirrored, because it contains all of my important data.
I am not too familiar with the DM RAID, which I think is the fake raid
driver for your motherboard (or raid card IIRC from your first post).
Assuming that is correct, I wouldn't use it. Software raid now uses the
mdadm program instead of raidtools. You could do this, which I am sure
would work but will take time. You will need two drives with matching
partition sizes for each raid 1 partition. At the point you are at, I
don't think it really matters. If you like the partitioning scheme you
have on /dev/hda, match it on /dev/hdb. each partition will need to be
marked as Linux Raid. Then, you could create a raid 1 for each
partition on /dev/hdb with mdadm with only one disk initially, then
format the new raid 1 partitions, then copy from /dev/hda. After
copying, you will need to change the partition type of each raided
partition on /dev/hda to Linux raid. Then use mdadm to add those
partition to your raid 1 partitions from /dev/hdb. This will sync each
one in turn. You will then need to edit /etc/fstab to correct your
partitions, i.e /dev/hda2 / to /dev/md0 /, etc. You should also edit
/boot/grub/menu.lst and correct as necessary (root=/dev/md0, etc), then
I would double check everything and reboot. You may or may not need to
reinstall Grub, though I probably would via the grub command prompt to
triple check it can find everything it needs BEFORE I am booting and it
tells me it cannot find..... I have done the above, and it will work.
It is a bit of work, and depending on data size will take a while.
ALSO, one other thing I just thought about, you would need to add raid1
module to your initrd modules and run mkinitrd to create the raid
bootable image. Check out
http://lists.opensuse.org/opensuse-amd64/2006-09/msg00034.html for
additional info.
--
Joe Morris
Registered Linux user 231871 running openSUSE 10.2 x86_64
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Ok, I got as far as creating a raid 1 array for each partition on /dev/hdb.
I created these:
/dev/md0 /dev/hdb1 /
/dev/md1 /dev/hdb3 /home
/dev/md2 /dev/hdb5 swap
Those were the three partitions on the /dev/hda, and they are the exact same
size as the ones on /dev/hda, and even start and end at the same cylinders.
I didn't know what to do about the extended partition on /dev/hda which was
used for the swap space, I assume. I created the exact same things on
/dev/hdb, including extended partition.
Now, I don't know what to do. I mount the /dev/md0 as /mnt/raid0, and I can
see all the files on it that must have been copied over when I tried the
hardware RAID card. It is the exact same thing as my "/" directory. I
created a new folder under "/" just to make sure, and it didn't show up in
the /dev/md0, so that's good.
When I tried to mount /dev/md1 as /mnt/raid1, it gives me an error: "mount:
Operation not supported". So I don't know what that means.
Also, it won't let me mount the /dev/md2 because it says it looks like swap
space, which it is.
Now, I don't know how to format the new raid 1 partitions on /dev/hdb so i
can copy my data over.
And thanks for your help, Joe.
-Brandon
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