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Old 09-21-2007, 10:52 AM   #1
Oskare100
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Registered: Jun 2005
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Create a RAID-1 of the boot disk and a new disk


Hello,
I had one disk before (/dev/sda) with two partitions, one swap and one ext3 where all the files are located. Now I've added a second disk (/dev/sdb) and want to create a RAID-1 disk of the two disks (based on the current /dev/sda disk). How can I do that? I've installed mdadm but I can't figure out how to create the RAID-1 since I'm running the system on /dev/sda.

Best Regards
Oskar R
 
Old 09-21-2007, 11:23 AM   #2
Micro420
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Registered: Aug 2003
Location: Berkeley, CA
Distribution: Mac OS X Leopard 10.6.2, Windows 2003 Server/Vista/7/XP/2000/NT/98, Ubuntux64, CentOS4.8/5.4
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partition your /dev/sdb similar to /dev/sda. I personally would use fdisk
Code:
fdisk /dev/sdb
Another user on here, i_grok, helped me and also mentioned that you could use the sfdisk command, but I haven't tried it. It's suppose to replicate the partitions to the other drive. For example,
Code:
sfdisk -d /dev/sda1 | sfdisk /dev/sdb1
After, create the initial /dev/md0, /dev/md1, etc...

Code:
mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sda1
mdadm --create --verbose /dev/md1 --level=1 --raid-devices=2 /dev/sda2
etc...
Now sync up /dev/sdb with /dev/sda
Code:
mdadm /dev/md0 --add /dev/sdb1
mdadm /dev/md1 --add /dev/sdb2
etc...
check the progress of the syncing
Code:
cat /proc/mdstat
You can always find more information
Code:
man mdadm
I could be wrong about all this, though. I've only done the software RAID once or twice and am recalling this from memory.

You can also google up this question as there are tons of articles online that will explain this

Last edited by Micro420; 09-21-2007 at 11:45 AM.
 
Old 09-21-2007, 04:45 PM   #3
Oskare100
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Registered: Jun 2005
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OK, I'll try that, however, I created /dev/md0 and /dev/md1 now by misstake when I tried another guide and now I can't remove them... They are (or should be) based on /dev/sdb1 and /dev/sdb2. How can I remove /dev/md0 and /dev/md1 now to be able to continue without reinstalling the system again?
 
Old 09-21-2007, 07:45 PM   #4
Micro420
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Registered: Aug 2003
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try
Code:
mdadm /dev/md0 --manage --stop 
mdadm /dev/md0 --manage --remove 
etc...

Last edited by Micro420; 09-21-2007 at 07:46 PM.
 
  


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