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RAID 0 performance vs. RAID 5

post #1 of 10
Thread Starter 
I recently picked up 2 new 7200.12 500GB Seagate drives. I already had an older 500GB Seagate in my system, and thought I'd give RAID5 a shot.

Got the RAID running and before cloning over my my current boot drive to the new RAID (and yes, I've taken steps to make sure it won't be angry at me) I ran a HD Tune test on it.

I didn't get a screenshot of it, but the stats were along these lines:

Transfer Rate:
Minimum: 60
Maximum: 115
Average: 69.9

Access Time: 13.9
Burst Rate: 122


Seemed a bit odd to me. I changed over the RAID 0 with the three drives. Without going into much detail, the results were still low, so I dropped the older drive (which turns out to be 7200.9) and re-created the array as RAID 0 again, and get this:



Now, obviously I would have better performance from RAID 0 than RAID 5 with the loss of parity, however the access time concerns me. From my understanding it should be MUCH lower than that. Am I right, or are these typical results from RAID 0?


Also, as a matter of getting a second opinion, given the huge difference in performance as a result of the older drive, would you:

A) Stay with RAID 5 for parity sake
B) Go to RAID 0 and use the old 500 as a manual backup and just load period Acronis Image files of the array on there
    
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post #2 of 10
That looks about right for Raid0. I get same thing.
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post #3 of 10
those results are almost 100mb faster then my 2 wd green raid 0 as well as about 4-5 less seek time.
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post #4 of 10
Thread Starter 
Ok, so I went with RAID 0 and finally got my clone to work on it so I don't have to reinstall windows.

However, in the process I had to break and re-create the RAID for various reasons. Now, after getting into windows, I'm getting a much different result.

I'm curious as to why I'm getting those abysmal drops and -50 on the burst rate and a higher ms when nothing hardware wise has changed?

    
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post #5 of 10
Thread Starter 
Bump. Concerned about the random massive drops.
    
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post #6 of 10
That seems a little low, but not too bad.

Try short stroking. I saw a huge improvement.


post #7 of 10
Do you get those type of drops with every test or just during that one?
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post #8 of 10
The drops are just system activity accessing the disk while HDTune is running. Nothing to worry about.

As to speeds, you access time won't change with any RAID setup. You can short-stroke the drives to be a noticeable improvement, however - see my mini Short-Stroke FAQ, linked below.
..a
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post #9 of 10
You really need to check the Read performance if you want to go RAID5.
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Once again...
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post #10 of 10
Quote:
Originally Posted by DuckieHo View Post
You really need to check the Read performance if you want to go RAID5.
Surely the write performance? This is where the problems with RAID5 (especially with an onboard controller) will show themselves.
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