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3つのボリュームを1つに統合したあとのボリュームのレイテンシ

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ontap-9
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perf<a>2009228384</a>
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環境

ONTAP 9

問題

  • 使用するボリュームが 1 つの場合、パフォーマンスが想定よりも低くなります
  • CPU利用率の低いボリュームで高いレイテンシが発生します

例:

  • コマンドの出力にsysstatは、平均CPU利用率が低いことが示されています
  • の出力にwafltopは、vol1の高I/Oのみが表示されます
  • vol1は運用の大部分を占めます
  • 他のボリュームからのレイテンシは高くない 
 I/O utilization ---------MB Read---------- ---------MB Write--------- --------IOs Read---------- --------IOs Write--------- Application MB Total Standard ExtCache Hybrid Standard ExtCache Hybrid Standard ExtCache Hybrid Standard ExtCache Hybrid ----------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- aggr1:vol1:cifs:WAFL_SPINNP_WRITE: 2558 9 0 0 2549 0 0 0 0 0 1287 0 0 aggr1:vol2:cifs:WAFL_SPINNP_WRITE: 12 0 0 0 12 0 0 0 0 0 3 0 0 aggr1:vol3:cifs:WAFL_SPINNP_WRITE: 7 0 0 0 7 0 0 0 0 0 1 0 0 aggr1:vol4:cifs:WAFL_SPINNP_WRITE: 5 0 0 0 5 0 0 0 0 0 1 0 0 Cluster::> node run -node node1 -command sysstat -x 1 CPU NFS CIFS HTTP Total Net kB/s Disk kB/s Tape kB/s Cache Cache CP CP_Ty CP_Ph Disk OTHER FCP iSCSI FCP kB/s iSCSI kB/s in out read write read write age hit time [T--H--F--N--B--O--#--:] [n--v--p--f] util in out in out 13% 261 3 0 2927 222768 258592 104 0 0 0 12 100% 0% 0--0--0--0--0--0--0--0 0--0--0--0 1% 2663 0 0 0 0 0 0 15% 403 6 0 3040 255451 255197 116 0 0 0 12 100% 0% 0--0--0--0--0--0--0--0 0--0--0--0 2% 2631 0 0 0 0 0 0 5% 348 10 0 811 6094 9894 232 24 0 0 12 100% 0% 0--0--0--0--0--0--0--0 0--0--0--0 2% 453 0 0 0 0 0 0

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