Raid Configuration

Posted on 2010-01-10
Medium Priority
Last Modified: 2013-11-14
Hopefully this is just a quickie,

I have a HP server with 8 SAS drives in it.   The machine is fresh and at present has nothing on it.   When I boot it up it only detects 6 of the drives.    I enter the HP Smart Array utility and it has the other two drives as options.

The drives each have two lights, at boot up the drives in question have the lights off.   When I select them using the utility, the blue lights appear, but not the green.   Then I select the array type and accept and the machine sets up the array but the lights on the bottom two drives are still off.

I hope this makes sense.  I am probably just doing something stupid.
Question by:Angry_Stu
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LVL 17

Accepted Solution

Tiras25 earned 2000 total points
ID: 26281095
SO I am guessing you probably have a RAID-5 with two spares? What does it say about the other two status?  Do they just sitting there idle?  Can you init them and put into RAID?

Author Comment

ID: 26281103
Before I even decide on the raid type, they are unlit.

My raid options are RAID 0 and RAID 1+0.   I put a tick in the boxes next to the two available drives, ticked the RAID 1+0 box and let it do it's thing.

Then it reboots and the two lower drives are still unlit.
LVL 17

Expert Comment

ID: 26281121
Can you boot into the RAID controller and see what's the configuration looks like there?
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Author Comment

ID: 26281222
Hah, you were right.   It was in RAID 5 configuration by default.

The problem was that I hadn't deleted the original configuration... ooops.

So when I deleted the initial RAID and set up a new one I can now see all 8 drives.   I selected all, I selected RAID 1+0.    Now all I need to know is what this is:

--Parity Group Count--
[ ]  2
[ ]  3
[ ]  4
[ ]  5

Do I need to select one of these or just leave it blank?
LVL 17

Expert Comment

ID: 26281253
One single parity group should be fine for RAID 10 so leave that blank.

Author Comment

ID: 26281278
Great, all done.   Thanks heaps for your help mate.

Expert Comment

ID: 30135813
For my knowledge, what is parity group count?

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