Raid 0+1 w/3HD

March 27, 2009 at 10:51:28
Specs: Windows Vista
A friend of mine set up my new PC with Raid 0+1, using 3 HD. Raid 0 is 2/160 HD and the 3rd is a 320 HD for back up. After he got done I said something is not right. How come under My Computer I can not see that 320 HD and only one, which appears to be the 2 / 160 tied together. Since I can't see it how the heck do I know if it is doing anything. I think something is wrong here. Can you run Raid 0+1 with 3 HD's ? With the 3rd drive only and no 4 HD can/could/should the 3 rd HD be partitioned or does it need not to be ? It seems on a quick search that Raid 0+1 is 4 HD but on another site it seems you can use 1 if that third HD is equal to the size of the other two combined.

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March 27, 2009 at 11:42:05
Raid 0+1 requires 4 disks and is a mirror of a stripe.

Now in theory you can do a hardware raid 0 and then do a software mirror of that raid 0 to a equal size drive.

You would only see one 320 gig drive.

The problem with this configuration is you have two weaknesses. One is if you experience disk corruption at the software raid level and two is if the raid0 becomes corrupt and thereby corrupts the software mirror.

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March 27, 2009 at 11:52:56
He said that the 3rd 360 HD was the Raid +1

Raid 0 = 2 / 160

Raid 1 = 1 / 320

I'm thinkin' you can not do this also. Is this correct ? Could one partitioned the 320 to = 2 /160 ?

Could I just run some other Raid and still use the 3 HD like Raid, 3, 4 or 5 ? What would you do with no other mony envolved ?

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March 27, 2009 at 13:07:24
There is no raid level that mixes hardware and software raid.
You cant' do hardware raid 0 and software raid 1 and say its raid 0+1 because 0+1 is a hardware config.

Tell your friend nice try. :-)

The setup will work and is working except for the risks I detailed for you in my first response.

The best you could do alternately is to raid5 the three disks but you would only be using 160 gig of the 320 gig drive
Raid 5= (1)160+(2nd)160+ 160 (out of 320)= (1)320gig volume

Hardware raid requires each disk to be the same size or if larger you can only strip according to the smallest drive.

Hardware wise this would have been your best option.

Concerning your question "Could one partitioned the 320 to = 2 /160 ?"

Hardware raid is a level below partitioning [like formatting is above partitioning] and has nothing to do with hardware raid.

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March 27, 2009 at 17:34:03
Ok Thanks

Is there any issue with using that 320 HD as a back-up for the Raid-0, using a program like Acronis.

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