Hi All,

I have a REHL 5 installed with these partitions

Disk1
Device Boot Start End Blocks Id System
/dev/sda1 * 1 25 200781 83 Linux
/dev/sda2 26 1069 8385930 82 Linux swap / Solaris
/dev/sda3 1070 91201 723985290 83 Linux

and i just put in a extra disk and am trying to create a Raid1 configuration.

What i did is i copied the partition table with

#sfdisk -d /dev/sda | sfdisk /dev/sdb

Then i changed the disk setting of sdb like this

Disk2
Device Boot Start End Blocks Id System
/dev/sdb1 * 1 25 200781 fd Linux raid autodetect
/dev/sdb2 26 1069 8385930 fd Linux raid autodetect
/dev/sdb3 1070 91201 723985290 fd Linux raid autodetect

Then i did this

mdadm --create /dev/md0 --level=1 --raid-disks=2 missing /dev/sdb1
mdadm --create /dev/md1 --level=1 --raid-disks=2 missing /dev/sdb2
mdadm --create /dev/md2 --level=1 --raid-disks=2 missing /dev/sdb3

cat /proc/mdstat give me this outpout

Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md2 : active raid1 sdb3[1]
723985216 blocks [2/1] [_U]

md1 : active raid1 sdb2[1]
8385856 blocks [2/1] [_U]

md0 : active raid1 sdb1[1]
200704 blocks [2/1] [_U]

unused devices: <none>

Here is where i get lost and don't know where to go from here

Can some one give me a word of advise ?

Best regards

Jesse

Ok so my guess here is your trying to mirror your root disk (disk1) to disk2?
I've never tried this but here's what I would try.
Create your logical volumes etc on disk 2 in your raid devices /dev/md? etc. Then copy (dd) in single user mode all the data from disk 1 to disk 2.
Now the hard part, reboot the system to disk 2.
Make sure the system starts comes up ok, then do re-create the partitions/raid sets on disk1, this should automatically mirror the data back.
Reboot and test.

This is just and Idea, as I say I've never tried it. Make sure you have a good backup before you start, try some thing like Clonezilla.

Hi FragInHell,

Thanx four your advise i will give it a tray but just one thing ! on Disk1 i don't have a LVM running!

Does that matter ?

Cheers

Jesse

I Just made the assumption as most installation normally default to Logical Volumes. In that case its makes it alot easier.
Boot from a Rescue CD, and copy all the data from disk1 to disk2, reboot onto disk two re-create the partitions on disk1 to match disk2 and add then add disk1 into the raid sat this will start the sync process.