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https://issues.apache.org/jira/browse/KAFKA-4971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15956205#comment-15956205
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Dasol Kim commented on KAFKA-4971:
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It might be a silly question, If kafka uses the page cache of the OS, if the OS
gets bottleneck, the OS is installed in the SSD on the server having both the
SSD and the HDD, and the kafka is installed on each of the SSD and HDD
separately Is not it an accurate experiment? I experimented with 9 servers I
had before experimenting with VMs, but the results of SSDs and HDDs were
similar, so I divided VMs into HDDs and SSDs and experimented.
> Why is there no difference between kafka benchmark tests on SSD and HDD?
> -------------------------------------------------------------------------
>
> Key: KAFKA-4971
> URL: https://issues.apache.org/jira/browse/KAFKA-4971
> Project: Kafka
> Issue Type: Test
> Affects Versions: 0.10.0.0
> Environment: Oracle VM VirtualBox
> OS : CentOs 7
> Memory : 1G
> Disk : 8GB
> Reporter: Dasol Kim
>
> I installed OS and kafka in the two SSD and two HDDs to perform the kafka
> benchmark test based on the disc difference. As expected, the SSD should show
> faster results, but according to my experimental results, there is no big
> difference between SSD and HDD. why? Ohter settings have been set to default.
> *test settings
> zookeeper node : 1, producer node : 2, broker node : 2(SSD 1, HDD 1)
> test scenario : Two producers send messages to the broker and compare the
> throughtput per second of kafka installed on SSD and kafka on HDD
> command : ./bin/kafka-producer-perf-test.sh --num-records 1000000
> --record-size 2000 --topic test --throughput 100000 --producer-props
> bootstrap.servers=SN02:9092
>
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