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when I try to use cosbench to test my cluster's performance, I find that performance of object storage swift fluctuates every 30 seconds. An experiment has been done as follows:

1 proxy server and 5 storage server( 3 for object server and the other 2 for account/container server), each server have 8*1T HDD, 64GB memory and 12 CPU cores. Just the service object server is launched. when only one client puts small objects to the cluster, the phenomenon occurs. I find that many disk requests arrive and all the disks latency rise suddenly every 30 seconds. Anyone can tell me why this happens.

trueman1990
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2 Answers2

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Default run_pause argument is set to 30 seconds. In every 30 seconds the object-replicator, container-replicator and account-replicator start to work.

small_ticket
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  • Finally I found out the root cause. The xfs file system will sync files every 30 seconds, that caused the performance degradation. – trueman1990 Nov 19 '14 at 13:00
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Finally I found out the root cause. The xfs file system will sync files every 30 seconds, that caused the performance degradation.

trueman1990
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