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1??????2??1??IOPS??

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2??OS???'?IO?????|??2????IO?e??

???D???t??3????DVM??1??????DRAID????D'?'????????????a??'e??1?3??????????a?'??D??2??????o???a??'e??2???a??????2?1???IO?D?T????2?????IO??3'????????'??'???????1???2?2??1??????'?????e2?DD'|???a2??DD??e?????a????????'?????????????'?'????cache??'??2??????????1ycache2?'|IO??????1y?y?????????????OS??IO?2???2??2????'????D???????t??3???cache???????VM???????IO?2??????2?????Striping???????????OS??IO??-1y????D??2??o??????'?????IO?2?????????????????2???????|?????

3??IOPS???3?'?e??

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?t??IO Response Time??|????

?'IO???|????IO?|???'2??3?o??3????IO?????????IO?|??????'???IO Response time3y?'?????y?Y???????1?2??3???'?'???3?2?IO?'y?????????'????IOPS??????aIO3????'y??IO?|??2???????????????OLTP??3??10ms?????|???????o???????????D?IOD???y?o

·     ???8K??IO????64K??IO??????ay?Y????D???

·     ???64K??IO?8??8K??IO??????a????????????IO??o???8??IO??

·     '?DDIO????IO????a'?DDIO??????IO?????'???DCache??'?DDIO?'??'|?2?D?2??

Da?a??IOPS?IO Response TimeD???D??a?????????????IOPS????????IO???????IO Response Time??|?????????3???IOPS??????????IO Response Time????3??y??3?1y20ms?????ms???ao??IOPS????1????????a???-2?'???a????IO??3??t??????-2?????

y??Throughput?????

?a?????a????oa????'??y?Y'?????????????a??????3D?????'y?Y???????????????a?????'y?Y?D'??o??

??2???IOPS???o????????T?D???1?????????o???'????IO'??????'????2???'??????????????????????????D?3??????????

1??IO Chunk Size

?'????IO2???y?Y??'D????'?IO2???'?3?IO????????y?Y??1y3??IO Chunk Size?|????????-D?o??D??1????????Oracle?y?Y?a????block size???a8K??????D'???'??a??????'???8K?a?a????3?a??IO Chunk Size??

IO Chunk SizeD?????????IO??3??IOPS?|??IO Chunk Size'???????oIO??3??IO????

2??Queue Deep

?y?Y?a??????a???SQL????????????a???''??2D???IO???2?????IO??????y???y?Y???o?'?????'?'???3???a??D????y?Y?2????DDo?2???????IOy?????Queue Deep?????????????e????IO???y???????Queue Deep?IO?y??2??????DD??????

Queue Deep?IOPSD???D1?????Queue Deep?a????????IO?????????DIOPS??????o2??Da????1?IO???'IO??'????-3?????Queue Deepa?2?2?'?????'????IOPS?????????Queue Deep??????????(2???3?????)??Queue Deep??D?256??

3???????????IO?????3D????3DIO??

?????????????'?IO?????y?Y?'????????????o'???o?2??2??????????'?N???3?D???IO??????o1K?????D??N'?IO???2????????|??y?Y??

?3D??????????????'????????y?Y?'??????????D????????3??eN???3?D???IO??????o1K?????a?'?IO?D'????????3????????y?Y??4K??8K?????????'?IO3??oD?IO?????y?Y????-D????a?????IO?????'?y???a2???????????

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??????D??2????|?3??Da1?22?????????a|?3??2????DD????????Da?????

?????oIOPS: ??????3??????IOPS???'?????????a??o?1?2Throughput????????????

?3D??oThroughput?o??3D????3??????Throughput?'???????'???T?????'?????????ao?1?2IOPS??oD???

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