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confused about velociraptor raid 0 speed vs barracuda raid 0 speed

post #1 of 20
Thread Starter 
So ive been doing some benchmarks, and it seems that my velociraptors in raid 0 are slower than my barracudas in raid 0?!! anyone know what could be causing this. the raptors are 150gb each and the barracudas are 750gb each. my sector size is 512 bytes on both. any insight on this would be greatly appreciated. I used HD Tune by the way

i would also like to add, im talking read/write speeds specifically, and i defragment my drives very frequently. And the barracudas actually are almost full, the raptors are half full
Edited by mmakam2 - 11/5/11 at 8:09am
    
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post #2 of 20
One of the biggest advantages of the Raptors are the access times, thats what is going to make everything feel faster (lower latency, which is one area where SSD's crush everything)
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post #3 of 20
You might get more insight if you post the benchmarks.

Later drives often have better performance than earlier.
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post #4 of 20
Thread Starter 
HD Tune Pro: Intel Raid 0 Volume File Benchmark

Drive C:

Transfer rate test

File Size: 500 MB

Sequential read206777 KB/s
Sequential write221714 KB/s
Random read167 IOPS
Random write823 IOPS
Random read (queue depth = 32)662 IOPS
Random write (queue depth = 32)984 IOPS

HD Tune Pro: Intel Raid 0 Volume Benchmark

Test capacity: 10 gB

Read transfer rate
Transfer Rate Minimum : 146.5 MB/s
Transfer Rate Maximum : 200.1 MB/s
Transfer Rate Average : 179.0 MB/s
Access Time : 4.92 ms
Burst Rate : 227.9 MB/s
CPU Usage : 1.7%

HD Tune Pro: Intel Raid 0 Volume File Benchmark

Drive E:

Transfer rate test

File Size: 500 MB

Sequential read221258 KB/s
Sequential write201019 KB/s
Random read114 IOPS
Random write468 IOPS
Random read (queue depth = 32)424 IOPS
Random write (queue depth = 32)465 IOPS

HD Tune Pro: Intel Raid 0 Volume Benchmark

Test capacity: 10 gB

Read transfer rate
Transfer Rate Minimum : 205.5 MB/s
Transfer Rate Maximum : 257.1 MB/s
Transfer Rate Average : 239.7 MB/s
Access Time : 6.71 ms
Burst Rate : 181.4 MB/s
CPU Usage : 2.0%
    
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post #5 of 20
Thread Starter 
the access time, and random access seem faster on the raptors but read speed is significantly slower, and write speed is barely faster
    
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post #6 of 20
A lot of people seem to think Raptors should be the king of hard drives or something. It's basically just a spindle speed of 10,000 vs 7200. Velociraptors have good performance acrross the entire disk because the platter is so small (also helps access times).

If your barracuda drives benefit from newer technology, well, they're probably going to have an advantage concerning performance.
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post #7 of 20
Thread Starter 
i dont have the part numbers on hand right now, but i bought all the drives new at the same time. and yea i understand its just the spindle speed and the size of the drive, but that should make all the difference.

People do mods on the barracudas to make it act like it is only 300gb and they were getting better results than the raptors. but mine are still at the full 750gb each drive.

Also you can tell a significant difference from a 5400rpm and a 7200rpm, shouldnt it be the same with 7200 and 10k?
    
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post #8 of 20
Thread Starter 
could it be the stripe size or sector size? i just set these on default, are there any sizes that work better than others?
    
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post #9 of 20
Quote:
Originally Posted by mmakam2;15581618 
i dont have the part numbers on hand right now, but i bought all the drives new at the same time. and yea i understand its just the spindle speed and the size of the drive, but that should make all the difference.

People do mods on the barracudas to make it act like it is only 300gb and they were getting better results than the raptors. but mine are still at the full 750gb each drive.

Also you can tell a significant difference from a 5400rpm and a 7200rpm, shouldnt it be the same with 7200 and 10k?

But a newer 5400RPM drive can beat an older 7200RPM one.
That's basically what's happening here, an F3 or similar drive would beat raptors in almost everything.
Not sure what 'cudas you have but if they're newer that would explain it.
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post #10 of 20
I personally use 128K for most Raid 0 setups. Raptors have better access time, most 7200RPMs are pulling equal or better sustained rates than them nowadays.

They've been a waste of money for awhile in my opinion. It's best just to get a drive or two for storage, and a SSD for the OS/programs/games.
Quote:
Originally Posted by mmakam2;15581618 
Also you can tell a significant difference from a 5400rpm and a 7200rpm, shouldnt it be the same with 7200 and 10k?

If both are OS drives, then sure. If they are storage drives... not so much. Many 5400rpms drives are pulling better numbers than old 7200rpms.

Increasing the RPMS does little for sustained rates, it helps random access times which is important for OS drives and useless for storage drives.
Edited by Murlocke - 11/5/11 at 10:08am
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