Index
RAID Explained and RAID 0
RAID 1
RAID 5
Other Configurations and Stripe Sizes
Types of RAID Cards
AMI MegaRAID 100, Iwill SIDE RAID100, and Promise FastTrak100
ADAPTEC AAA-UDMA
Promise SuperTrak100
About the Test
Iometer: Understanding the Results
The Test
Software RAID vs. Hardware RAID: Behind the Scenes
Performance: AMI MegaRAID 100
Complete Performance: AMI MegaRAID 100
Performance: Iwill SIDE RAID100
Complete Performance: Iwill SIDE RAID100
Performance: Promise FastTrak100
Complete Performance: Promise FastTrak100
Performance: Adaptec AAA-UDMA
Complete Performance: Adaptec AAA-UDMA
Performance: Promise SuperTrak100
Complete Performance: Promise SuperTrak100
Performance: RAID 0
Complete Performance: RAID 0
Performance: RAID 5
Complete Performance: RAID 5
Performance: RAID 1
Complete Performance: RAID 1
Conclusion
Complete Performance: Promise FastTrak100
Promise
FastTrak100
1KB 2KB 4KB 8KB 16KB 32KB 64KB 128KB 256KB 512KB 1024KB
CCW01 42.6 41.8 41.2 42.3 42.3 42.9 43 42.8 42.8 42.1 41.4
File
server Low
Total
I/O/sec 69.36 70.51
75.04 77.18 78.07 79.76 81.37 82.3 82.21 81.82
Total
MB/sec 0.75 0.77 0.76 0.81 0.83 0.84 0.87 0.88 0.89 0.88 0.88
Avg
I/O response 14.4147 14.1793 14.2613 13.3232 12.9548 12.8063 12.5356 12.2865 12.148 12.162 12.2193
CPU
Util 1.55 1.58 1.03 0.97 1 1.04 1.04 1.03 1.09 1 0.98
File
server Med
Total
I/O/sec 105.45 105.92 107 111.35 113.82 114.7 116.99 117.59 117.75 118.47 118.64
Total
MB/sec 1.14 1.16 1.15 1.21 1.22 1.25 1.25 1.26 1.28 1.28 1.28
Avg
I/O response 303.397 302.028 299.01 287.324 281.078 278.929 273.463 272.088 271.769 270.039 269.656
CPU
Util 1.93 1.32 1.35 1.34 1.34 1.42 1.43 1.37 1.39 1.35 1.31
File
server High
Total
I/O/sec 119.07 119.16 121.11 126.79 130.2 131.36 134.04 135.27 135.73 136.63 137.01
Total
MB/sec 1.28 1.29 1.31 1.38 1.42 1.43 1.46 1.46 1.46 1.47 1.48
Avg
I/O response 1074.41 1037.36 1056.17 1008.98 982.396 937.588 954.199 945.592 942.232 936.274 933.584
CPU
Util 2.07 1.61 1.6 1.61 1.55 1.6 1.64 1.5 1.57 1.54 1.54
Database
Low
Total
I/O/sec 68.71 66.99 66.46 69.12 75.91 80.32 83.76 85.63 86.2 86.52 86.21
Total
MB/sec 0.54 0.52 0.52 0.54 0.59 0.63 0.65 0.67 0.67 0.68 0.67
Avg
I/O response 14.5512 14.9236 15.0429 14.4647 13.1701 12.4475 11.9361 11.6751 11.5975 11.555 11.5973
CPU
Util 1.67 1.15 1.14 1.18 1.12 1.17 1.22 1.19 1.11 1.04 1.14
Database
Med
Total
I/O/sec 104.36 103.97 103.78 105.37 113.76 119.87 122.61 124.13 124.97 126.07 126.28
Total
MB/sec 0.82 0.81 0.81 0.82 0.89 0.94 0.96 0.97 0.98 0.98 0.99
Avg
I/O response 306.568 307.732 308.256 303.662 281.234 266.914 260.931 257.754 256.022 253.777 253.339
CPU
Util 2.01 1.57 1.45 1.48 1.51 1.34 1.35 1.32 1.47 1.37 1.43
Database
High
Total
I/O/sec 118.06 118.05 118.06 119.22 130.64 137.64 142.2 144.01 145.14 146.07 146.29
Total
MB/sec 0.92 0.92 0.92 0.93 1.02 1.08 1.11 1.13 1.13 1.14 1.14
Avg
I/O response 1083.64 1083.44 1003.33 1073.09 979.116 929.297 899.442 888.325 881.394 875.739 874.187
CPU
Util 2.13 1.69 1.68 1.68 1.68 1.74 1.66 1.62 1.62 1.58 1.64
Workstation
Low
Total
I/O/sec 82.37 81.63 80.55 82.11 83.55 89.4 93.42 95.3 97.12 96.82 97.26
Total
MB/sec 0.64 0.64 0.63 0.64 0.65 0.7 0.73 0.74 0.76 0.76 0.76
Avg
I/O response 12.138 12.2486 12.4129 12.1761 11.9654 11.1825 10.7014 10.4909 10.2941 10.3264 10.2793
CPU
Util 1.7 1.25 1.24 1.3 1.2 1.22 1.27 1.29 1.23 1.26 1.26
Workstation
High
Total
I/O/sec 133.88 133.76 133.83 134.44 136.78 144.63 150 151.88 153.33 154.56 154.8
Total
MB/sec 1.05 1.05 1.05 1.05 1.07 1.13 1.17 1.19 1.2 1.21 1.21
Performance: Promise FastTrak100
Performance: Adaptec AAA-UDMA
Index
RAID Explained and RAID 0
RAID 1
RAID 5
Other Configurations and Stripe Sizes
Types of RAID Cards
AMI MegaRAID 100, Iwill SIDE RAID100, and Promise FastTrak100
ADAPTEC AAA-UDMA
Promise SuperTrak100
About the Test
Iometer: Understanding the Results
The Test
Software RAID vs. Hardware RAID: Behind the Scenes
Performance: AMI MegaRAID 100
Complete Performance: AMI MegaRAID 100
Performance: Iwill SIDE RAID100
Complete Performance: Iwill SIDE RAID100
Performance: Promise FastTrak100
Complete Performance: Promise FastTrak100
Performance: Adaptec AAA-UDMA
Complete Performance: Adaptec AAA-UDMA
Performance: Promise SuperTrak100
Complete Performance: Promise SuperTrak100
Performance: RAID 0
Complete Performance: RAID 0
Performance: RAID 5
Complete Performance: RAID 5
Performance: RAID 1
Complete Performance: RAID 1
Conclusion
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2 Comments
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kburrows - Thursday, December 4, 2003 - link
Have you run any tests on any onboard RAID solutions for RAID 0 & 1? I would love to see the results posted for the new SATA RAID on the Intel 875 boards.Anonymous User - Sunday, August 17, 2003 - link
In adressing the performance of an raid array with different stripe sizes, you miss an important factor, namely the accestime of an disk. This wait time has two main couses. First the head positioning and second the rotational latency (the heads track the right trace, but position where the read start has not passed under the head). You may have to wait from 0 to (in the worst case) a full cycle.Since the disks move independently You can calculate that the average latency to get an small file is minimal when the stripe size is about an full cycle of an disk in the array (aprox. 250kB today). All other factors I do know do not reduce this. (controller overhead, transport,...)
So I think that today a minimum stripe size of 256kB should be used.