Topic: Add non-blank disc to raid array

[markehle]

`Hello, Folks -

I have an old HP DL140 that I use for running BackupPC in my organization. It had a really old version of SME on it. I installed 7.2 today. It has 2 250gb drives on it. In order to install it, I had to pull one of them off and hook up a CD drive, because it does not have enough power plugs. The install went fine as it always does, but when I hook up the other drive, I am not sure that it is doing raid right. My suspicion is that because the drive I pulled off is not blank, I don't get a full drive's worth of raid out of it. Here is my cat /proc/mdstat:

Personalities : [raid1]
md0 : active raid1 hdb1[1]
      104320 blocks [2/1] [_U]

md2 : active raid1 hda2[0]
      244091520 blocks [2/1] [U_]

md1 : active raid1 hda1[0]
      104320 blocks [2/1] [U_]

unused devices: <none>

And the admin console says that "manual intervention may be required"

Is there anything I can do to wipe the added drive and make raid happy without having to physically pull it out and wipe it?

Thanks!

Mark

[byte]

http://wiki.contribs.org/Raid

[markehle]

Thanks!

so I am guessing that:

dd if=/dev/zero of=/dev/hdx bs=512 count=1

(zeroing out the MBR)

is the line I want?

[markehle]

Since there is no data on the machine right now, there were no real issues if I had to dump it, I went ahead and tried:

dd if=/dev/zero of=/dev/hdb bs=512 count=1

 - with a reboot -

and the server manager comes back and asks me if I want to use the unused disk, I say 'yes', and now it says a RAID resynch is in progress. Wa-hoo! It works! God - I love SME!

Thanks again, byte!

[byte]

so I am guessing that:

dd if=/dev/zero of=/dev/hdx bs=512 count=1

(zeroing out the MBR)

is the line I want?

As you've found out that is the line you needed as you previously had that disk with windows or something else. No worries.

[p-jones]

Did you go into the admin menu and try adding the disk to the raid ?