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Old Feb 11th, 2011, 10:12 PM   #1
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RAID-0 vs RAID-1

So, I got this shiny PowerMac G5 from my uncle, and it came with a 250GB HardDrive. I also have two 1TB HDD that I have no clue what to do with. How can I put those HardDrive to good use? I want to put 2 HDD's into this PowerMac and make those 2 harddrives be read as one. This PowerMac will be my main machine, which means it'll have all my documents, Minecraft saves, music, photos and a bit of video (various animé); this data amounts to roughly 500GB. From what I could understand RAID-0 is perfect, but the problem is that if one HD fails, all is lost, RAID-1 is great, but I'll be loosing half of my HDD space. My question: Which is better: RAID-0 (1TB + 250GB) and a Time machine backup of 1TB OR RAID-1 with 2 1TB drives?
Thanks.
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Old Feb 12th, 2011, 12:37 AM   #2
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Raid 0 allows for more space, but makes you want to place more files on the large volume. If that crashes, I would be PISSED. I would rather know my files are safe. So I personally thing Raid 1 is better.
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Old Feb 12th, 2011, 09:10 AM   #3
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Quote:
Originally Posted by MacGenius24 View Post
Raid 0 allows for more space, but makes you want to place more files on the large volume. If that crashes, I would be PISSED. I would rather know my files are safe. So I personally thing Raid 1 is better.
They serve completely different purposes. RAID 0 is for a performance increase i.e. faster read and writes.

RAID 1 is for data redundancy and is actually slower than writing to 1 hard drive. It is NOT a back up strategy and even RAID 1 arrays should have the data backed up. RAID 1 is more for an enterprise or heavy workflow environment so that if 1 drive fails you can be back up and operational quickly. However the faulty drive would still need to be replaced and the array rebuilt.

For the average user RAID 0 for a performance boost in conjunction with a solid back-up strategy is the way to go IMO.

Last edited by screature; Feb 12th, 2011 at 09:30 AM.
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Old Feb 12th, 2011, 09:25 AM   #4
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Quote:
Originally Posted by K2ACP View Post
So, I got this shiny PowerMac G5 from my uncle, and it came with a 250GB HardDrive. I also have two 1TB HDD that I have no clue what to do with. How can I put those HardDrive to good use? I want to put 2 HDD's into this PowerMac and make those 2 harddrives be read as one. This PowerMac will be my main machine, which means it'll have all my documents, Minecraft saves, music, photos and a bit of video (various animé); this data amounts to roughly 500GB. From what I could understand RAID-0 is perfect, but the problem is that if one HD fails, all is lost, RAID-1 is great, but I'll be loosing half of my HDD space. My question: Which is better: RAID-0 (1TB + 250GB) and a Time machine backup of 1TB OR RAID-1 with 2 1TB drives?
Thanks.
You cannot run disks of different size as RAID 0 or RAID 1, they need to be of identical size and most preferably of identical model. The only array you can make with disks of different sizes is JBOD (just a bunch of disks) and I personally see no advantage to doing this.

Again RAID 1 is not a back up strategy, it is merely redundancy.

To have both stripping and redundancy you need RAID 5. But this cannot be done with software RAID alone and you need a RAID card (hardware) or an enclosure that has the hardware built into it to implement this form of RAID.

Personally I would put in 2 disks of the same size and model stripped RAID 0 for performance and then use a solid backup strategy. You could go Time Machine but I prefer a scheduled cloning strategy using SuperDuper or Carbon Copy Cloner to an external hard drive.

For more about RAID check out, Standard RAID levels.

Last edited by screature; Feb 12th, 2011 at 09:54 AM.
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Old Feb 12th, 2011, 09:53 AM   #5
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+1

I'd only add that the 250 is okay for TM for critical work
But I'd just get an additional 2 TB external and use part for TM and most for a full clone



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Old Feb 12th, 2011, 02:04 PM   #6
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You cannot run disks of different size as RAID 0 or RAID 1, they need to be of identical size and most preferably of identical model.
untrue. if you mirror you can use different size drives, but the raid set will only be as large as the smallest drive in the set. if you stripe then the set is limited to twice the size of the smallest drive
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Old Feb 12th, 2011, 02:24 PM   #7
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untrue. if you mirror you can use different size drives, but the raid set will only be as large as the smallest drive in the set. if you stripe then the set is limited to twice the size of the smallest drive
OK fine... but why waste space? I mean really?

Unless you want to waste money/space it isn't even worth mentioning... Just trying to keep things practical. But yes technically you are right for completeness sake.

I should have stated it the way you said, but for practical/cost purposes it is better to have identically sized drives and models.

Last edited by screature; Feb 12th, 2011 at 02:43 PM.
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Old Feb 12th, 2011, 06:10 PM   #8
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Why RAID at all?

Your 1 TB drives are plenty fast as is. There's no pressing need to have a single 2 TB volume that I can see, especially with the risk of failure of RAID 0.

I would rather have two independent drives, and use CarbonCopyCloner or SuperDuper to maintain backups. Maybe make a 2nd 250 GB partition on one of the 1TB drives and maintain a clone of your boot drive there.
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