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RAID question

post #1 of 34
Thread Starter 
Hey,

I already have a 7200RPM 250 gig 8mb cache sata 1.5g hard drive. Now can I get another one, thats say 7200RPM 250 gig, 16MB cache sata 3.0g. Can I do that or does it need to be like exactly the same. Also whats the performance difference between between say a Sata 1.5g and a 3.0g drive? And with raid, will I notice a difference with the smaller cache?

- Atomic
    
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post #2 of 34
Quote:
Originally Posted by atomicfission92 View Post
Hey,

I already have a 7200RPM 250 gig 8mb cache sata 1.5g hard drive. Now can I get another one, thats say 7200RPM 250 gig, 16MB cache sata 3.0g. Can I do that or does it need to be like exacformanceetween say a Sata 1.5g and a 3.0g drive? And with raid, will I notice a difference with the smaller cache?

- Atomic
For a RAID array, the drives need to be exactly the same. I haven't tested it, but you might be able to get away with using drives of the same b

As far as the interface speed goes, it doesn't matter much. Current hard drives don't reach that 150mbps limit with their burst speeds,000 rpm in Raid 0. The burst rate on those dirves is about 102mbps max and the average is more like 85mbps (if I remember correctlde, scsi, etc.) will not change performance. Hard drives are not meeting tto AGP vs PCrence between the two didn't affect performance that much, or at least notufactorers claimed. When you read "Sata 300!!" on a box, it is mostly just a marketing gimmick to those who think bigger numbers = better HDD.
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post #3 of 34
You can use both of those drives, but your performance will be limited to the slower drive. At least I have heard that. It is best to have 2 identical drives.

EDIT: RAID is great. If you use RAID0, be sure to backup important data. RAID0 is not a "real" RAID because it isn't redundant. I noticed a large performance boost
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post #4 of 34
Thread Starter 
But even if it runs at the same speed as my lower drive its still gonna be a hell of a lot faster right?
    
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post #5 of 34
Quote:
Originally Posted by atomicfission92 View Post
But even if it runs at the same speed as my lower drive its still gonna be a hell of a lot faster right?
Yes. It is 1/2 the data on each drive, so it can read/write much faster.
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post #6 of 34
Thread Starter 
Quote:
Originally Posted by stevemc View Post
Yes. It is 1/2 the data on each drive, so it can read/write much faster.
yea I understand that part. But I wasn't sure if I can use 2 different drives, I know that they have to be the same size right?
    
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post #7 of 34
Quote:
Originally Posted by atomicfission92 View Post
yea I understand that part. But I wasn't sure if I can use 2 different drives, I know that they have to be the same size right?
I know RAID can only use the same amount of space per drive. I think if you were to put a 200GB and 300GB drive in RAID, you would only see 400GB (not counting data loss from formatting) as opposed to 500GB. It is best to have 2 identical drives. But your setup should work.
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post #8 of 34
Thread Starter 
Quote:
Originally Posted by stevemc View Post
I know RAID can only use the same amount of space per drive. I think if you were to put a 200GB and 300GB drive in RAID, you would only see 400GB (not counting data loss from formatting) as opposed to 500GB. It is best to have 2 identical drives. But your setup should work.

Alright cool. And did LembasBread die while posting?
    
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post #9 of 34
Quote:
Originally Posted by atomicfission92 View Post
Alright cool. And did LembasBread die while posting?
Some people don't have a very good grasp on the concept of time

In response to LembasBread. I have heard of people using drives with different specs, but the same capacity in RAID0 and it worked. That is what I am going on. I have not seen this in person, and those who claim that it works may be full of BS. I also said that the very best situation is to have 2 identical drives. Sites like WikiPedia claim that the size of the disks does not necessarily have to be the same.

So, in conclusion, I have heard of it working with 2 different drives (specs different, same capacity), and other sources claim that it works with drives of different capacity. Once again, it is ideal to have 2 identical drives.
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post #10 of 34
it may or it may not work I've known instances where people could not RAID the same make/model drive because it had different firmware revisions.
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