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Why are my SSDs running so slowly in RAID-0

  • NAS / RAID
  • Hard Drives
  • SSD
  • Storage
Last response: in Storage
April 9, 2010 6:19:48 AM

I need some help understanding why my Patriot warp SSD hard drives are operating so slowly

I recently started building a new computer after a bit of benchmarking research I decided to use two SSD’s and put them in a raid 0 configuration. Everyone I talked to told me that this would be the fastest solution for under a grand.
I placed the drives in raid 0 with the built in motherboard raid controller installed windows and everything runs fine but I couldn’t help but notice that it wasn’t booting/ running nearly as fast as I predicted. So I decided to benchmark it and compare to my old hard drive running the same setup. My RAID-0 Patriots 60 Mbps read and my old western digital got 70 Mbps. This shocked me to see even though running the SSD’s didn’t seem fast. I thought that they would at least benchmark as fast as a old school HHD. Just using 1 of these drives by themselves seemed to run much much faster than the two together (I didn’t benchmark this setup because it was before I knew of the problem)
So I am confused, I was expecting at least 200Mbps (A hopeful estimate) in my research I found that the drives I’m using benchmarked alone at 120Mbps

Hardware list:
Pentium I5-650 processor
Gigabyte P55A-UD3 motherboard
Coursair XMS3 dual channel memory 2X2Gs DDR3
Patriot Warp SSD 32G (two of these)

I am using Performance test 6.1 for my benchmarking

I am running windows 7 ultimate 64-bit

More about : ssds running slowly raid

a c 127 G Storage
April 9, 2010 8:16:09 AM

Go download HDTune Pro, and submit the benchmarks of:
- normal benchmark
- File benchmark (set file size to 64MB)
- random access benchmark

That should give us a fair idea of your striped SSD's performance.

The Patriot Warp series uses the JMicron JMF-602 controller which has been blamed over the web for slow operation with small random writes - the random access test should show this. So it is part of the family of slower SSDs; not part of the higher-performance SSDs with controllers like Intel, SandForce or Micron.
April 9, 2010 8:52:32 AM

normal benchmark:
access time .2ms
burst rate 266Mbs
CPU usage = -1% (i don't know how that is but ok)

why are these numbers so different from my benchmarking software?

HD Tune Pro: Intel Raid 0 Volume File Benchmark

Drive C:

File Size: 64 MB

Block size Read speed
0.5 KB 2151 KB/s
1 KB 4274 KB/s
2 KB 8245 KB/s
4 KB 15540 KB/s
8 KB 30718 KB/s
16 KB 59400 KB/s
32 KB 127375 KB/s
64 KB 191665 KB/s
128 KB 236785 KB/s
256 KB 235312 KB/s
512 KB 208612 KB/s
1024 KB 240269 KB/s
2048 KB 241996 KB/s
4096 KB 243137 KB/s
8192 KB 245242 KB/s

Block size Write speed
0.5 KB 3188 KB/s
1 KB 5922 KB/s
2 KB 10456 KB/s
4 KB 16974 KB/s
8 KB 26703 KB/s
16 KB 33300 KB/s
32 KB 56783 KB/s
64 KB 103558 KB/s
128 KB 130291 KB/s
256 KB 101058 KB/s
512 KB 120020 KB/s
1024 KB 144664 KB/s
2048 KB 125750 KB/s
4096 KB 79410 KB/s
8192 KB 103266 KB/s

HD Tune Pro: Intel Raid 0 Volume Random Access

Test capacity: full

Read test

Transfer size operations / sec avg. access time avg. speed
512 bytes 4825 IOPS 0.21 ms 2.356 MB/s
4 KB 4080 IOPS 0.25 ms 15.940 MB/s
64 KB 1724 IOPS 0.58 ms 107.804 MB/s
1 MB 208 IOPS 4.8 ms 208.541 MB/s
Random 392 IOPS 2.5 ms 198.981 MB/s

HD Tune Pro: Intel Raid 0 Volume Benchmark

Test capacity: full

Read transfer rate
Transfer Rate Minimum : 0.3 MB/s
Transfer Rate Maximum : 220.0 MB/s
Transfer Rate Average : 171.5 MB/s
Access Time : 0.2 ms
Burst Rate : 266.0 MB/s
CPU Usage : -1.0%
Related resources
a c 127 G Storage
April 9, 2010 2:06:45 PM

4000 IOps, 240MB/s sequential read and 140MB/s sequential write. The IOps are on the low side, but its normal for JMicron; actually pretty good scores i'd say. But two bad SSD don't make one good SSD; an Intel SSD will still be many times faster.

However, i don't see any obvious performance issue here.
April 9, 2010 5:12:30 PM

maby a firmwall update will do it?