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为什么 ONTAP "statistics volume" 和 Active IQ Unified Manager IOP 计数之间存在差异?

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适用场景

  • OnCommand 统一管理器( OCUM )
  • Active IQ Unified Manager ( AIQUM )
  • ONTAP 9

问题解答

  • 卷层或 WAFL 层的大小最大为 64 KB 。
  • 协议( LUN 或 CIFS/NFS 操作)的操作大小可以更大( 65 KB 到 MB )。
  • 多个操作将划分为协议和 WAFL 之间的 64 KB 并行请求。
  • 这也可能会影响 QoS 策略:
    • QoS 策略用于协议层操作计数。
  • 示例: Microsoft SQL 可能会以 256 KB 顺序读取的形式对 LUN 执行数据库查询,从而转换为 4 条 64 KB WAFL 读取消息。

 

  • 另一个原因是,工作负载可能会出现在不同的节点上,因此,如果使用的命令行界面输出, IOP 计数将取决于要衡量的节点 qos statistics

追加信息

  • 要比较这两者,可以使用以下命令:
    • Cluster::> set diag -c off; statistics start -object volume-vserver <SVM name> -instance <volume name> -node <node where data LIF is>
    • Cluster::> qos statistics volume performance show -vserver <SVM name> -volume <volume name>
  • NetApp 收集卷视图显示 WAFL 层的指标(类似于 statistics start -object volume)。

示例: 从 " 收获 " 和 AIQUM 获取的 IOPS 的屏幕截图

AIQUM.png

Harvest.png

 

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