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通过 VAAI 副本卸载提高了延迟,并降低了吞吐量

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ontap-9
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适用场景

  • ONTAP 9
  • VAAI 副本卸载
  • Data ONTAP 8 7-模式

问题描述

  • System Manager 信息板显示较高的 LUN 延迟,而 IOPS 或吞吐量没有显著增加。
  • 高延迟主要用于 SAN 其他操作。 
  • HDD read/writeSSD read/write 远高于 FCP in/outiSCSI in/outsysstat -x 或来自输出。 
    • 如果 VAAI 副本卸载源卷和目标卷来自同一节点, Net in/out 则低至 FCP in/outiSCSI in/outsysstat -x
    • 如果 VAAI 副本卸载源卷和目标卷来自不同的节点, Net in/out 则与 HDD read/write 中的或相同。 SSD read/writesysstat -x

示例 1 

san_other_1.png

注:

  • iSCSI + HDD
  • 同一节点上的 VAAI 副本卸载源卷和目标卷
  • Net in/outiSCSI in/out 都远低于 HDD read/write

示例 2

san_other_2_source.png

注: 

  • FCP + SSD
  • 源卷和目标卷来自不同的节点
  • 这是源节点
  • Net out 与 SSD 读取高度相同,并且两者都远高于 FCP out

示例 3 : 

san_other_2_dest.png

注:

  • FCP + SSD
  • 源卷和目标卷来自不同的节点
  • 这是目标节点
  • Net in 的高至 SSD write,并且都远高于 FCP in

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