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RAID 5 & 0

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  • NAS / RAID
  • Storage
Last response: in Storage
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April 21, 2007 1:32:02 AM

I currently have a Intel Desktop Board D975XBX2 and run a raid 0 for my OS. I want to run a RAID 5 for storage. Would it be possible for me to run a raid 0 for my system OS and run a raid 5 for storage simultaneously?

More about : raid

April 22, 2007 2:08:06 AM

Yes. You need a minimum of 3 drives to do RAID 5. With Intel Matrix RAID, you can allocate part of the drives to one RAID array and the rest to another.
April 24, 2007 2:28:30 AM

Matrix RAID assumes you left empty space on your RAID0.

But if Intel supports this feature, then its safe to assume you can run multiple independant RAID sets on your machine.

But in researching this very quickly, I noticed there are 2 chips on the board, the Intel RAID and Marvell RAID. If this is 6 ports Intel and 2 Marvel, and your existing RAID0 is on the Intel ports then your max for the new RAID5 will be 4 drives.

If you have a way to backup the RAID0 and then reconstruct it on the Marvel side (which only does 0 and 1) then you could use up to 6 ports for the RAID5.
April 25, 2007 12:41:52 AM

Quote:
I currently have a Intel Desktop Board D975XBX2 and run a raid 0 for my OS. I want to run a RAID 5 for storage. Would it be possible for me to run a raid 0 for my system OS and run a raid 5 for storage simultaneously?
I like matrix raid, It works great. I've got 4 500G 7200.10 drives configured as 500G raid 0 and 1.1T raid 5.

I have two OS images but d: is just for restoring (no apps installed). If I ever do lose a drive, I just replace it, boot into the repair console from the dvd, install a new MBR (or whatever they call it now), boot directly from d: and wait for intel to to rebuild the raid 5 partition, all data restored. After that I can just do a clean restore back to c: and I'm back at it.

Intel has fully checked my raid5 partition once (I guess it recalc'ed all of the parity stripes) because I prematurely shut it down and I've got write caching turned on - I don't know if there was any problems, intel just automatically went into a deminished check-up mode and it took 2-3 hrs before everything was flying again. a 4-drive raid0 is very fast and the raid 5 is just marginally slower.

ich7 has 4 ports and the marvel has 4 ports - I'm just planning to eventually use the marvel for e-sata or dvd drives - I'll probably never put a HD on it.
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