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...

ディスクのストライプサイズはデフォルトの64K固定です。

1Disk-RAID0 WriteThrough

Image RemovedImage Removed

チャート
imageFormatpng
orientationhorizontal
forgivefalse
width1000
rangeAxisLowerBound0
dataOrientationvertical
titleN8103-130-raid0-WT-1disk IOPS
typebar
rangeAxisUpperBound100000
xLabelTest Pattern
height500


Access Specification NameRead IOpsWrite IOps
512 B; 100% Read; 0% random_QD17719.80.0
512 B; 100% Read; 0% random_QD3289650.80.0
512 B; 50% Read; 0% random_QD11024.91033.2
512 B; 50% Read; 0% random_QD323658.03661.1
512 B; 0% Read; 0% random_QD10.06650.8
512 B; 0% Read; 0% random_QD320.074875.2
4 KiB; 100% Read; 0% random_QD16387.10.0
4 KiB; 100% Read; 0% random_QD3268688.00.0
4 KiB; 50% Read; 0% random_QD11893.01891.0
4 KiB; 50% Read; 0% random_QD3215382.815404.2
4 KiB; 0% Read; 0% random_QD10.06349.2
4 KiB; 0% Read; 0% random_QD320.052811.1
256 KiB; 100% Read; 0% random_QD11206.00.0
256 KiB; 100% Read; 0% random_QD321714.40.0
256 KiB; 50% Read; 0% random_QD1353.4346.6
256 KiB; 50% Read; 0% random_QD32515.9514.8
256 KiB; 0% Read; 0% random_QD10.01080.9
256 KiB; 0% Read; 0% random_QD320.01218.1
1M-Seq-100%R_QD1415.60.0
1M-Seq-100%R_QD32428.70.0
1M-Seq-50%R_QD1133.6137.6
1M-Seq-50%R_QD32132.6131.1
1M-Seq-100%W_QD10.0307.9
1M-Seq-100%W_QD320.0304.1
1M-rand-100%R_QD1317.90.0
1M-rand-100%R_QD32410.70.0
1M-rand-50%R_QD1133.3138.1
1M-rand-50%R_QD32134.9134.9
1M-rand-100%W_QD10.0308.3
1M-rand-100%W_QD320.0299.8





チャート
imageFormatpng
orientationhorizontal
forgivefalse
width1000
rangeAxisLowerBound0
dataOrientationvertical
titleN8103-130-raid0-WT-1disk MB/s
typebar
rangeAxisUpperBound2500
xLabelTest Pattern
height500


Access Specification NameRead MBps (Decimal)Write MBps (Decimal)
512 B; 100% Read; 0% random_QD14.00.0
512 B; 100% Read; 0% random_QD3245.90.0
512 B; 50% Read; 0% random_QD10.50.5
512 B; 50% Read; 0% random_QD321.91.9
512 B; 0% Read; 0% random_QD10.03.4
512 B; 0% Read; 0% random_QD320.038.3
4 KiB; 100% Read; 0% random_QD126.20.0
4 KiB; 100% Read; 0% random_QD32281.30.0
4 KiB; 50% Read; 0% random_QD17.87.7
4 KiB; 50% Read; 0% random_QD3263.063.1
4 KiB; 0% Read; 0% random_QD10.026.0
4 KiB; 0% Read; 0% random_QD320.0216.3
256 KiB; 100% Read; 0% random_QD1316.10.0
256 KiB; 100% Read; 0% random_QD32449.40.0
256 KiB; 50% Read; 0% random_QD192.690.9
256 KiB; 50% Read; 0% random_QD32135.2134.9
256 KiB; 0% Read; 0% random_QD10.0283.4
256 KiB; 0% Read; 0% random_QD320.0319.3
1M-Seq-100%R_QD1435.80.0
1M-Seq-100%R_QD32449.50.0
1M-Seq-50%R_QD1140.1144.3
1M-Seq-50%R_QD32139.1137.4
1M-Seq-100%W_QD10.0322.8
1M-Seq-100%W_QD320.0318.8
1M-rand-100%R_QD1333.30.0
1M-rand-100%R_QD32430.70.0
1M-rand-50%R_QD1139.8144.8
1M-rand-50%R_QD32141.5141.5
1M-rand-100%W_QD10.0323.3
1M-rand-100%W_QD320.0314.4



何気にAHCIよりIO性能が高い…。SSD自体に256MBのDRAMが載っているので、そもそもカード自体のDRAMが不要な可能性があります。

CDMの4G、100MBリードの参考値です。ちなみにDiskcacheを無効にするとシーケンシャルでも書き込みが45MB/s程度まで落ちました。

Image Added

Image Added




1Disk-RAID0 WriteBack

Image RemovedImage Removed

5GBというキャッシュに乗り切らないサイズのせいか、違いがぜんぜんわからん!

WTモード時とのデータの向上率の比較をしてみる

Image Removed

チャート
imageFormatpng
orientationhorizontal
forgivefalse
width1000
rangeAxisLowerBound0
dataOrientationvertical
titleN8103-130-raid0-WB-1disk IOPS
typebar
rangeAxisUpperBound100000
xLabelTest Pattern
height500


Access Specification NameRead IOpsWrite IOps
512 B; 100% Read; 0% random_QD14301.60.0
512 B; 100% Read; 0% random_QD3287637.20.0
512 B; 50% Read; 0% random_QD12087.82095.7
512 B; 50% Read; 0% random_QD3210308.410368.4
512 B; 0% Read; 0% random_QD10.013426.3
512 B; 0% Read; 0% random_QD320.045188.0
4 KiB; 100% Read; 0% random_QD14165.80.0
4 KiB; 100% Read; 0% random_QD3248356.30.0
4 KiB; 50% Read; 0% random_QD11878.21860.2
4 KiB; 50% Read; 0% random_QD3213939.213922.0
4 KiB; 0% Read; 0% random_QD10.012120.9
4 KiB; 0% Read; 0% random_QD320.030910.1
256 KiB; 100% Read; 0% random_QD11191.30.0
256 KiB; 100% Read; 0% random_QD321780.10.0
256 KiB; 50% Read; 0% random_QD1378.6376.6
256 KiB; 50% Read; 0% random_QD32402.7402.1
256 KiB; 0% Read; 0% random_QD10.01218.4
256 KiB; 0% Read; 0% random_QD320.01218.0
1M-Seq-100%R_QD1416.30.0
1M-Seq-100%R_QD32447.90.0
1M-Seq-50%R_QD1128.7129.8
1M-Seq-50%R_QD32122.3120.3
1M-Seq-100%W_QD10.0305.9
1M-Seq-100%W_QD320.0305.4
1M-rand-100%R_QD1292.70.0
1M-rand-100%R_QD32305.90.0
1M-rand-50%R_QD1119.6117.5
1M-rand-50%R_QD32110.5111.5
1M-rand-100%W_QD10.0285.2
1M-rand-100%W_QD320.0282.1



チャート
imageFormatpng
orientationhorizontal
forgivefalse
width1000
rangeAxisLowerBound0
dataOrientationvertical
titleN8103-130-raid0-WB-1disk MB/s
typebar
rangeAxisUpperBound2500
xLabelTest Pattern
height500


Access Specification NameRead MBps (Decimal)Write MBps (Decimal)
512 B; 100% Read; 0% random_QD12.20.0
512 B; 100% Read; 0% random_QD3244.90.0
512 B; 50% Read; 0% random_QD11.11.1
512 B; 50% Read; 0% random_QD325.35.3
512 B; 0% Read; 0% random_QD10.06.9
512 B; 0% Read; 0% random_QD320.023.1
4 KiB; 100% Read; 0% random_QD117.10.0
4 KiB; 100% Read; 0% random_QD32198.10.0
4 KiB; 50% Read; 0% random_QD17.77.6
4 KiB; 50% Read; 0% random_QD3257.157.0
4 KiB; 0% Read; 0% random_QD10.049.6
4 KiB; 0% Read; 0% random_QD320.0126.6
256 KiB; 100% Read; 0% random_QD1312.30.0
256 KiB; 100% Read; 0% random_QD32466.60.0
256 KiB; 50% Read; 0% random_QD199.398.7
256 KiB; 50% Read; 0% random_QD32105.6105.4
256 KiB; 0% Read; 0% random_QD10.0319.4
256 KiB; 0% Read; 0% random_QD320.0319.3
1M-Seq-100%R_QD1436.60.0
1M-Seq-100%R_QD32469.60.0
1M-Seq-50%R_QD1134.9136.1
1M-Seq-50%R_QD32128.2126.2
1M-Seq-100%W_QD10.0320.8
1M-Seq-100%W_QD320.0320.3
1M-rand-100%R_QD1306.90.0
1M-rand-100%R_QD32320.70.0
1M-rand-50%R_QD1125.4123.3
1M-rand-50%R_QD32115.8116.9
1M-rand-100%W_QD10.0299.1
1M-rand-100%W_QD320.0295.8


5GBというキャッシュに乗り切らないサイズのせいか、違いがぜんぜんわからん!

WTモード時とのデータの向上率の比較をしてみる

チャート
imageFormatpng
orientationhorizontal
dataDisplayafter
forgivefalse
width1000
dataOrientationvertical
titleWB時増分
typebar
yLabelWT vs WB (%)
xLabelTest Pattern
height500


Access Specification Name対WT比Read IOps 増分(%)対WT比Write IOps増分(%)
512 B; 100% Read; 0% random_QD1-44.27840
512 B; 100% Read; 0% random_QD32-2.246020
512 B; 50% Read; 0% random_QD1103.7055102.828
512 B; 50% Read; 0% random_QD32181.8043183.2034
512 B; 0% Read; 0% random_QD10101.8742
512 B; 0% Read; 0% random_QD320-39.6489
4 KiB; 100% Read; 0% random_QD1-34.77720
4 KiB; 100% Read; 0% random_QD32-29.60010
4 KiB; 50% Read; 0% random_QD1-0.77824-1.62854
4 KiB; 50% Read; 0% random_QD32-9.38483-9.62174
4 KiB; 0% Read; 0% random_QD1090.90597
4 KiB; 0% Read; 0% random_QD320-41.4706
256 KiB; 100% Read; 0% random_QD1-1.214280
256 KiB; 100% Read; 0% random_QD323.8310430
256 KiB; 50% Read; 0% random_QD17.1405738.666481
256 KiB; 50% Read; 0% random_QD32-21.9534-21.8982
256 KiB; 0% Read; 0% random_QD1012.71637
256 KiB; 0% Read; 0% random_QD320-0.00466
1M-Seq-100%R_QD10.1833230
1M-Seq-100%R_QD324.4696010
1M-Seq-50%R_QD1-3.69594-5.69608
1M-Seq-50%R_QD32-7.78602-8.20952
1M-Seq-100%W_QD10-0.63321
1M-Seq-100%W_QD3200.440793
1M-rand-100%R_QD1-7.91010
1M-rand-100%R_QD32-25.52830
1M-rand-50%R_QD1-10.3011-14.8897
1M-rand-50%R_QD32-18.1436-17.3741
1M-rand-100%W_QD10-7.48275
1M-rand-100%W_QD320-5.91396


0%でキャッシュ無し時と同じなので、512 B; 100% Read; 0% random_QD1の-44%というのは、キャッシュを有効にすると逆に性能劣化が起きてキャッシュ無しの半分の性能になっているパターンです。

...

WBの効果が出ているかCDMも走らせてみましたが、キャッシュに収まる100MBでテストしたところキャッシュ速度はずいぶんと速いようです。

Image Added

Image Added



4Disk-RAID0 WT

Image RemovedImage Removed

チャート
imageFormatpng
orientationhorizontal
forgivefalse
width1000
rangeAxisLowerBound0
dataOrientationvertical
titleN8103-130-raid0-WT-4disk IOPS
typebar
rangeAxisUpperBound100000
xLabelTest Pattern
height500


Access Specification NameRead IOpsWrite IOps
512 B; 100% Read; 0% random_QD16940.80.0
512 B; 100% Read; 0% random_QD3291156.40.0
512 B; 50% Read; 0% random_QD11078.91072.4
512 B; 50% Read; 0% random_QD325258.65237.9
512 B; 0% Read; 0% random_QD10.06781.9
512 B; 0% Read; 0% random_QD320.065642.9
4 KiB; 100% Read; 0% random_QD16246.80.0
4 KiB; 100% Read; 0% random_QD3265568.30.0
4 KiB; 50% Read; 0% random_QD11915.81916.8
4 KiB; 50% Read; 0% random_QD3216575.216536.7
4 KiB; 0% Read; 0% random_QD10.06829.7
4 KiB; 0% Read; 0% random_QD320.053894.7
256 KiB; 100% Read; 0% random_QD12444.30.0
256 KiB; 100% Read; 0% random_QD326789.30.0
256 KiB; 50% Read; 0% random_QD1560.9568.0
256 KiB; 50% Read; 0% random_QD321634.71638.7
256 KiB; 0% Read; 0% random_QD10.02288.9
256 KiB; 0% Read; 0% random_QD320.04825.3
1M-Seq-100%R_QD11179.90.0
1M-Seq-100%R_QD321702.70.0
1M-Seq-50%R_QD1295.7294.4
1M-Seq-50%R_QD32406.8407.8
1M-Seq-100%W_QD10.0956.3
1M-Seq-100%W_QD320.01206.7
1M-rand-100%R_QD1835.50.0
1M-rand-100%R_QD321660.50.0
1M-rand-50%R_QD1311.4308.7
1M-rand-50%R_QD32447.0443.2
1M-rand-100%W_QD10.0842.0
1M-rand-100%W_QD320.01191.1



チャート
imageFormatpng
orientationhorizontal
forgivefalse
width1000
rangeAxisLowerBound0
dataOrientationvertical
titleN8103-130-raid0-WT-4disk MB/s
typebar
rangeAxisUpperBound2500
xLabelTest Pattern
height500


Access Specification NameRead MBps (Decimal)Write MBps (Decimal)
512 B; 100% Read; 0% random_QD13.60.0
512 B; 100% Read; 0% random_QD3246.70.0
512 B; 50% Read; 0% random_QD10.60.5
512 B; 50% Read; 0% random_QD322.72.7
512 B; 0% Read; 0% random_QD10.03.5
512 B; 0% Read; 0% random_QD320.033.6
4 KiB; 100% Read; 0% random_QD125.60.0
4 KiB; 100% Read; 0% random_QD32268.60.0
4 KiB; 50% Read; 0% random_QD17.87.9
4 KiB; 50% Read; 0% random_QD3267.967.7
4 KiB; 0% Read; 0% random_QD10.028.0
4 KiB; 0% Read; 0% random_QD320.0220.8
256 KiB; 100% Read; 0% random_QD1640.70.0
256 KiB; 100% Read; 0% random_QD321779.80.0
256 KiB; 50% Read; 0% random_QD1147.0148.9
256 KiB; 50% Read; 0% random_QD32428.5429.6
256 KiB; 0% Read; 0% random_QD10.0600.0
256 KiB; 0% Read; 0% random_QD320.01264.9
1M-Seq-100%R_QD11237.20.0
1M-Seq-100%R_QD321785.40.0
1M-Seq-50%R_QD1310.1308.7
1M-Seq-50%R_QD32426.6427.6
1M-Seq-100%W_QD10.01002.7
1M-Seq-100%W_QD320.01265.3
1M-rand-100%R_QD1876.10.0
1M-rand-100%R_QD321741.20.0
1M-rand-50%R_QD1326.5323.7
1M-rand-50%R_QD32468.7464.7
1M-rand-100%W_QD10.0882.9
1M-rand-100%W_QD320.01249.0


IOPS的にいえば1ディスク構成時の90kからあまり増加はないので、コントローラ的には90kIOPSくらいが限界のようです。

...

HDDを16台くらいぶら下げれば、帯域の方はシーケンシャルIOで上限にあたる可能性がありますが、それなりにがんばらないと到達できないと思います。


4Disk-RAID0 WB

Image RemovedImage Removed

例によってWT/WBの対比が分からないので増分

Image Removed

チャート
imageFormatpng
orientationhorizontal
forgivefalse
width1000
rangeAxisLowerBound0
dataOrientationvertical
titleN8103-130-raid0-WT-4disk IOPS
typebar
rangeAxisUpperBound100000
xLabelTest Pattern
height500


Access Specification NameRead IOpsWrite IOps
512 B; 100% Read; 0% random_QD14276.10.0
512 B; 100% Read; 0% random_QD3281612.70.0
512 B; 50% Read; 0% random_QD12214.92201.7
512 B; 50% Read; 0% random_QD3214851.014866.8
512 B; 0% Read; 0% random_QD10.013579.5
512 B; 0% Read; 0% random_QD320.044799.9
4 KiB; 100% Read; 0% random_QD15287.80.0
4 KiB; 100% Read; 0% random_QD3259036.20.0
4 KiB; 50% Read; 0% random_QD12001.11975.5
4 KiB; 50% Read; 0% random_QD3215599.815597.6
4 KiB; 0% Read; 0% random_QD10.012209.6
4 KiB; 0% Read; 0% random_QD320.029762.4
256 KiB; 100% Read; 0% random_QD12122.10.0
256 KiB; 100% Read; 0% random_QD326870.30.0
256 KiB; 50% Read; 0% random_QD1660.0656.2
256 KiB; 50% Read; 0% random_QD321648.01673.6
256 KiB; 0% Read; 0% random_QD10.02127.6
256 KiB; 0% Read; 0% random_QD320.03935.9
1M-Seq-100%R_QD11150.80.0
1M-Seq-100%R_QD321744.70.0
1M-Seq-50%R_QD1285.3281.9
1M-Seq-50%R_QD32394.7393.1
1M-Seq-100%W_QD10.0757.1
1M-Seq-100%W_QD320.01052.7
1M-rand-100%R_QD1826.20.0
1M-rand-100%R_QD321739.80.0
1M-rand-50%R_QD1297.3289.7
1M-rand-50%R_QD32465.1458.2
1M-rand-100%W_QD10.0753.9
1M-rand-100%W_QD320.01025.4



チャート
imageFormatpng
orientationhorizontal
forgivefalse
width1000
rangeAxisLowerBound0
dataOrientationvertical
titleN8103-130-raid0-WT-4disk MB/s
typebar
rangeAxisUpperBound2500
xLabelTest Pattern
height500


Access Specification NameRead MBps (Decimal)Write MBps (Decimal)
512 B; 100% Read; 0% random_QD12.20.0
512 B; 100% Read; 0% random_QD3241.80.0
512 B; 50% Read; 0% random_QD11.11.1
512 B; 50% Read; 0% random_QD327.67.6
512 B; 0% Read; 0% random_QD10.07.0
512 B; 0% Read; 0% random_QD320.022.9
4 KiB; 100% Read; 0% random_QD121.70.0
4 KiB; 100% Read; 0% random_QD32241.80.0
4 KiB; 50% Read; 0% random_QD18.28.1
4 KiB; 50% Read; 0% random_QD3263.963.9
4 KiB; 0% Read; 0% random_QD10.050.0
4 KiB; 0% Read; 0% random_QD320.0121.9
256 KiB; 100% Read; 0% random_QD1556.30.0
256 KiB; 100% Read; 0% random_QD321801.00.0
256 KiB; 50% Read; 0% random_QD1173.0172.0
256 KiB; 50% Read; 0% random_QD32432.0438.7
256 KiB; 0% Read; 0% random_QD10.0557.7
256 KiB; 0% Read; 0% random_QD320.01031.8
1M-Seq-100%R_QD11206.70.0
1M-Seq-100%R_QD321829.40.0
1M-Seq-50%R_QD1299.2295.6
1M-Seq-50%R_QD32413.9412.2
1M-Seq-100%W_QD10.0793.9
1M-Seq-100%W_QD320.01103.9
1M-rand-100%R_QD1866.30.0
1M-rand-100%R_QD321824.40.0
1M-rand-50%R_QD1311.7303.7
1M-rand-50%R_QD32487.7480.5
1M-rand-100%W_QD10.0790.5
1M-rand-100%W_QD320.01075.3


例によってWT/WBの対比が分からないので増分

チャート
imageFormatpng
orientationhorizontal
dataDisplayafter
forgivefalse
width1000
dataOrientationvertical
titleWB時増分
typebar
yLabelWT vs WB (%)
xLabelTest Pattern
height500


Access Specification Name対WT比Read IOps 増分(%)対WT比Write IOps増分(%)
512 B; 100% Read; 0% random_QD1-38.39260
512 B; 100% Read; 0% random_QD32-10.46960
512 B; 50% Read; 0% random_QD1105.3036105.2979
512 B; 50% Read; 0% random_QD32182.4146183.829
512 B; 0% Read; 0% random_QD10100.2315
512 B; 0% Read; 0% random_QD320-31.7521
4 KiB; 100% Read; 0% random_QD1-15.35250
4 KiB; 100% Read; 0% random_QD32-9.962260
4 KiB; 50% Read; 0% random_QD14.4516383.060278
4 KiB; 50% Read; 0% random_QD32-5.8848-5.67845
4 KiB; 0% Read; 0% random_QD1078.77088
4 KiB; 0% Read; 0% random_QD320-44.7767
256 KiB; 100% Read; 0% random_QD1-13.18050
256 KiB; 100% Read; 0% random_QD321.1935010
256 KiB; 50% Read; 0% random_QD117.6612715.54095
256 KiB; 50% Read; 0% random_QD320.8095172.130234
256 KiB; 0% Read; 0% random_QD10-7.04535
256 KiB; 0% Read; 0% random_QD320-18.4334
1M-Seq-100%R_QD1-2.466640
1M-Seq-100%R_QD322.4631720
1M-Seq-50%R_QD1-3.53151-4.23811
1M-Seq-50%R_QD32-2.97517-3.60646
1M-Seq-100%W_QD10-20.8247
1M-Seq-100%W_QD320-12.7551
1M-rand-100%R_QD1-1.110880
1M-rand-100%R_QD324.7780210
1M-rand-50%R_QD1-4.51558-6.17381
1M-rand-50%R_QD324.0557173.391034
1M-rand-100%W_QD10-10.4651
1M-rand-100%W_QD320-13.909


CDMでも似た傾向がみれます。

Image Modified



4Disk-RAID5 WT

Image RemovedImage Removed

チャート
imageFormatpng
orientationhorizontal
forgivefalse
width1000
rangeAxisLowerBound0
dataOrientationvertical
titleN8103-130-raid5-WT-4disk IOPS
typebar
rangeAxisUpperBound100000
xLabelTest Pattern
height500


Access Specification NameRead IOpsWrite IOps
512 B; 100% Read; 0% random_QD120830.30.0
512 B; 100% Read; 0% random_QD3252757.60.0
512 B; 50% Read; 0% random_QD12082.92088.7
512 B; 50% Read; 0% random_QD3210805.810802.6
512 B; 0% Read; 0% random_QD10.02383.8
512 B; 0% Read; 0% random_QD320.026774.4
4 KiB; 100% Read; 0% random_QD116791.80.0
4 KiB; 100% Read; 0% random_QD3250097.20.0
4 KiB; 50% Read; 0% random_QD11996.71965.9
4 KiB; 50% Read; 0% random_QD329497.69487.7
4 KiB; 0% Read; 0% random_QD10.02061.5
4 KiB; 0% Read; 0% random_QD320.014986.2
256 KiB; 100% Read; 0% random_QD11304.70.0
256 KiB; 100% Read; 0% random_QD326076.60.0
256 KiB; 50% Read; 0% random_QD1357.5356.7
256 KiB; 50% Read; 0% random_QD321076.21092.7
256 KiB; 0% Read; 0% random_QD10.0598.4
256 KiB; 0% Read; 0% random_QD320.0927.2
1M-Seq-100%R_QD1802.00.0
1M-Seq-100%R_QD321595.40.0
1M-Seq-50%R_QD1147.6148.9
1M-Seq-50%R_QD32299.8306.2
1M-Seq-100%W_QD10.0194.4
1M-Seq-100%W_QD320.0275.3
1M-rand-100%R_QD1812.60.0
1M-rand-100%R_QD321589.90.0
1M-rand-50%R_QD1147.7148.3
1M-rand-50%R_QD32297.8300.0
1M-rand-100%W_QD10.0195.2
1M-rand-100%W_QD320.0417.2



チャート
imageFormatpng
orientationhorizontal
forgivefalse
width1000
rangeAxisLowerBound0
dataOrientationvertical
titleN8103-130-raid5-WT-4disk MB/s
typebar
rangeAxisUpperBound2500
xLabelTest Pattern
height500


Access Specification NameRead MBps (Decimal)Write MBps (Decimal)
512 B; 100% Read; 0% random_QD110.20.0
512 B; 100% Read; 0% random_QD3225.80.0
512 B; 50% Read; 0% random_QD11.01.0
512 B; 50% Read; 0% random_QD325.35.3
512 B; 0% Read; 0% random_QD10.01.2
512 B; 0% Read; 0% random_QD320.013.1
4 KiB; 100% Read; 0% random_QD165.60.0
4 KiB; 100% Read; 0% random_QD32195.70.0
4 KiB; 50% Read; 0% random_QD17.87.7
4 KiB; 50% Read; 0% random_QD3237.137.1
4 KiB; 0% Read; 0% random_QD10.08.1
4 KiB; 0% Read; 0% random_QD320.058.5
256 KiB; 100% Read; 0% random_QD1326.20.0
256 KiB; 100% Read; 0% random_QD321519.10.0
256 KiB; 50% Read; 0% random_QD189.489.2
256 KiB; 50% Read; 0% random_QD32269.0273.2
256 KiB; 0% Read; 0% random_QD10.0149.6
256 KiB; 0% Read; 0% random_QD320.0231.8
1M-Seq-100%R_QD1802.00.0
1M-Seq-100%R_QD321595.40.0
1M-Seq-50%R_QD1147.6148.9
1M-Seq-50%R_QD32299.8306.2
1M-Seq-100%W_QD10.0194.4
1M-Seq-100%W_QD320.0275.3
1M-rand-100%R_QD1812.60.0
1M-rand-100%R_QD321589.90.0
1M-rand-50%R_QD1147.7148.3
1M-rand-50%R_QD32297.8300.0
1M-rand-100%W_QD10.0195.2
1M-rand-100%W_QD320.0417.2


読み込みはRAID0の1.8GB/sに対して、RAID5でも最大約1.6GB/sと優秀なのですが、書き込みは最大でも300MB/sと残念なことに。

RAID0の時は512BQD32の書き込みが66kIOPSあったのに対して、RAID5の時は26kIOPSまで落ちたので、やはりパリティー計算が必要なRAIDのオーバーヘッドは大きいです。



4Disk-RAID5 WB

...

チャート
imageFormatpng
orientationhorizontal
forgivefalse
width1000
rangeAxisLowerBound0
dataOrientationvertical
titleN8103-130-raid5-WB-4disk IOPS
typebar
rangeAxisUpperBound100000
xLabelTest Pattern
height500


Access Specification NameRead IOpsWrite IOps
512 B; 100% Read; 0% random_QD13978.40.0
512 B; 100% Read; 0% random_QD3239704.50.0
512 B; 50% Read; 0% random_QD12090.72089.1
512 B; 50% Read; 0% random_QD3218088.718101.6
512 B; 0% Read; 0% random_QD10.013874.9
512 B; 0% Read; 0% random_QD320.044595.3
4 KiB; 100% Read; 0% random_QD13799.30.0
4 KiB; 100% Read; 0% random_QD3245016.80.0
4 KiB; 50% Read; 0% random_QD11852.81851.5
4 KiB; 50% Read; 0% random_QD3213908.413879.6
4 KiB; 0% Read; 0% random_QD10.011953.1
4 KiB; 0% Read; 0% random_QD320.029739.9
256 KiB; 100% Read; 0% random_QD11449.90.0
256 KiB; 100% Read; 0% random_QD326443.60.0
256 KiB; 50% Read; 0% random_QD1570.9577.0
256 KiB; 50% Read; 0% random_QD321162.91172.7
256 KiB; 0% Read; 0% random_QD10.01555.2
256 KiB; 0% Read; 0% random_QD320.02141.7
1M-Seq-100%R_QD1833.70.0
1M-Seq-100%R_QD321679.60.0
1M-Seq-50%R_QD1237.3240.0
1M-Seq-50%R_QD32342.7355.7
1M-Seq-100%W_QD10.0534.0
1M-Seq-100%W_QD320.0536.3
1M-rand-100%R_QD1826.60.0
1M-rand-100%R_QD321720.10.0
1M-rand-50%R_QD1233.1238.9
1M-rand-50%R_QD32348.3348.7
1M-rand-100%W_QD10.0484.0
1M-rand-100%W_QD320.0499.0



チャート
imageFormatpng
orientationhorizontal
forgivefalse
width1000
rangeAxisLowerBound0
dataOrientationvertical
titleN8103-130-raid5-WB-4disk MB/s
typebar
rangeAxisUpperBound2500
xLabelTest Pattern
height500


Access Specification NameRead MBps (Decimal)Write MBps (Decimal)
512 B; 100% Read; 0% random_QD12.00.0
512 B; 100% Read; 0% random_QD3220.30.0
512 B; 50% Read; 0% random_QD11.11.1
512 B; 50% Read; 0% random_QD329.39.3
512 B; 0% Read; 0% random_QD10.07.1
512 B; 0% Read; 0% random_QD320.022.8
4 KiB; 100% Read; 0% random_QD115.60.0
4 KiB; 100% Read; 0% random_QD32184.40.0
4 KiB; 50% Read; 0% random_QD17.67.6
4 KiB; 50% Read; 0% random_QD3257.056.9
4 KiB; 0% Read; 0% random_QD10.049.0
4 KiB; 0% Read; 0% random_QD320.0121.8
256 KiB; 100% Read; 0% random_QD1380.10.0
256 KiB; 100% Read; 0% random_QD321689.10.0
256 KiB; 50% Read; 0% random_QD1149.6151.3
256 KiB; 50% Read; 0% random_QD32304.9307.4
256 KiB; 0% Read; 0% random_QD10.0407.7
256 KiB; 0% Read; 0% random_QD320.0561.4
1M-Seq-100%R_QD1874.20.0
1M-Seq-100%R_QD321761.10.0
1M-Seq-50%R_QD1248.9251.7
1M-Seq-50%R_QD32359.4373.0
1M-Seq-100%W_QD10.0560.0
1M-Seq-100%W_QD320.0562.3
1M-rand-100%R_QD1866.70.0
1M-rand-100%R_QD321803.70.0
1M-rand-50%R_QD1244.4250.5
1M-rand-50%R_QD32365.2365.6
1M-rand-100%W_QD10.0507.5
1M-rand-100%W_QD320.0523.3



チャート
imageFormatpng
orientationhorizontal
dataDisplayafter
forgivefalse
width1000
dataOrientationvertical
titleWB時増分
typebar
yLabelWT vs WB (%)
xLabelTest Pattern
height500


Access Specification Name対WT比Read IOps 増分(%)対WT比Write IOps増分(%)
512 B; 100% Read; 0% random_QD1-80.90080
512 B; 100% Read; 0% random_QD32-24.74160
512 B; 50% Read; 0% random_QD10.3743550.015933
512 B; 50% Read; 0% random_QD3267.3972867.56659
512 B; 0% Read; 0% random_QD10482.0557
512 B; 0% Read; 0% random_QD32066.55948
4 KiB; 100% Read; 0% random_QD1-77.37430
4 KiB; 100% Read; 0% random_QD32-10.14110
4 KiB; 50% Read; 0% random_QD1-7.2077-5.82038
4 KiB; 50% Read; 0% random_QD3246.4411646.29059
4 KiB; 0% Read; 0% random_QD10479.8198
4 KiB; 0% Read; 0% random_QD32098.44912
256 KiB; 100% Read; 0% random_QD111.124180
256 KiB; 100% Read; 0% random_QD326.0394540
256 KiB; 50% Read; 0% random_QD159.6797161.75022
256 KiB; 50% Read; 0% random_QD328.0590767.317294
256 KiB; 0% Read; 0% random_QD10159.8849
256 KiB; 0% Read; 0% random_QD320130.9874
1M-Seq-100%R_QD13.9511610
1M-Seq-100%R_QD325.2726360
1M-Seq-50%R_QD160.7914861.17785
1M-Seq-50%R_QD3214.3281116.1741
1M-Seq-100%W_QD10174.7787
1M-Seq-100%W_QD32094.76335
1M-rand-100%R_QD11.7220710
1M-rand-100%R_QD328.1867690
1M-rand-50%R_QD157.8420661.04148
1M-rand-50%R_QD3216.9375516.22543
1M-rand-100%W_QD10147.958
1M-rand-100%W_QD32019.62272


通説通り、RAID5の時はWBキャッシュがあると性能向上があります。512BQD32の書き込みがWT時には26kIOPSでしたがWB時には44kIOPSまで上がりました。

...

CDMでも似た傾向は出ましたが、たとえば4KQD32時の書き込みがIOMeterだとWB時に121MB/s出ているのに対して、CDMだと35MB/sになっているなど、結構違いが出ているので参考値です。

Image Modified


まとめ

4000円前後で買える割にはそこまで悪くないと思います。RAID5で運用する際にはBBU+キャッシュを、0で運用する際にはキャッシュしない設定にする、と言うのがベストのようです。

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