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为什么 statistics volume show 命令显示与读取,写入和其他操作不匹配的总操作数?

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适用场景

ONTAP 9

问题解答

  • 对于较新版本的 ONTAP , NFS 或 CIFS 卷
    • Total Ops = Read + Write + Other + Access + Getattr + Lookup + Punch Hole + Setattr
  • 因此, NAS 卷 other 实际上是除读取,写入,访问, getattr ,查找, SETATTR 和 Punch Hole 。

statistics volume show 命令显示卷层统计信息,其中不包括 getattr ,查找,访问, setattr 或打孔的细分。

示例
Cluster1::*> statistics volume show -interval 5
Cluster1 : 4/15/2021 13:08:29
                                        *Total Read Write Other    Read    Write   Latency
 Volume    Vserver            Aggregate    Ops  Ops   Ops   Ops   (Bps)    (Bps)      (us)
------- ---------- -------------------- ------ ---- ----- ----- ------- --------   -------
nasdata   svmnas          sas_aggr1     85759 3751  1314  1922 6020330   19856178      20
lun1      svmsan         sata_aggr1      8411 8312    99     0 524286336  1347968   20720

因此, NAS 卷的总操作数与读取,写入和其他操作不匹配。但 SAN 卷的总操作数与读取,写入和其他操作匹配。

  • 对于卷层( NFS 或 CIFS ): Total Ops != Read + Write + Other Ops
  • 对于卷层( SAN ): Total Ops = Read + Write + Other Ops

追加信息

按照以下步骤检查 NFS 详细操作。

  1. 切换到集群 Shell 上的高级模式。

示例
Cluster1::> set adv

  1. 启动 NFS 详细操作计数器的统计信息。

示例
Cluster1::*> statistics start -sample-id testother -object volume -instance vol1 -counter nfs_read_ops|nfs_write_ops|nfs_other_ops|nfs_access_ops|nfs_getattr_ops|nfs_lookup_ops|nfs_total_ops

Statistics collection is being started for sample-id: testother

  1. 等待几分钟,然后停止统计信息样本。

示例
Cluster1::*> statistics stop -sample-id testother

Statistics collection is being stopped for sample-id: testother

  1. 检查 NFS 详细操作。

示例
Cluster1::*> statistics show -sample-id testother

Object: volume
Instance: vol1
Start-time: 4/16/2021 19:19:10
End-time: 4/16/2021 19:19:25
Elapsed-time: 15s
Scope: svm1
    Counter                                                     Value
    -------------------------------- --------------------------------
    nfs_access_ops                                                  0
    nfs_getattr_ops                                                 0
    nfs_lookup_ops                                                  0
    nfs_other_ops                                                   0
    nfs_read_ops                                                    0
    nfs_total_ops                                                   0
    nfs_write_ops                                                   0
7 entries were displayed.

5. 切换回管理模式。

示例
Cluster1::> set admin

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