application commands
qos statistics volume latency show
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Display latency breakdown data per volume
Availability: This command is available to cluster administrators at the admin privilege level.
Description
The qos statistics volume latency show command displays the average latencies for volumes on Data ONTAP subsystems.
The command displays the following data:
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The QoS volume name (Workload)
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The QoS workload ID (ID)
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Total latency observed per I/O operation (Latency)
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Latency observed per I/O operation in the Network subsystem (Network)
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Latency observed per I/O operation across the internally connected nodes in a Cluster (Cluster)
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Latency observed per I/O operation in the Data management subsystem (Data)
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Latency observed per I/O operation in the Storage subsystem (Disk)
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Latency observed per I/O operation for QoS Policy Group Ceiling (QoS Max)
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Latency observed per I/O operation for QoS Policy Group Floor (QoS Min)
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Latency observed per I/O operation for NVRAM transfer (NVRAM)
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Latency observed per I/O operation for Object Store(Cloud) operations
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Latency observed per I/O operation for FlexCache (FlexCache) operations
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Latency observed per I/O operation for Synchronous Snapmirror (SM Sync) operations
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Latency observed per I/O operation for Volume Activation (VA) operations
The results displayed per iteration are sorted by the total latency field. Each iteration starts with a row that displays the average latency, in microseconds (us) or milliseconds (ms) observed across all volumes.
Parameters
[-node {<nodename>|local}]- Node-
Selects the volumes that match this parameter value. If you do not specify this parameter, the command displays data for the entire cluster.
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[-rows <integer>]- Number of Rows in the Output -
Specifies the number of busiest QoS policy groups to display. The default setting is 10. The allowed range of values is 1 to 20.
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-vserver <vserver name>- Vserver Name -
Specifies the Vserver to which the volume belongs.
-volume <volume name>- Volume Name }-
Selects the latency data that match this parameter value. Enter a complete volume name or press the <Tab> key to complete the name. Wildcard query characters are not supported.
[-iterations <integer>]- Number of Iterations-
Specifies the number of times that the command refreshes the display with updated data before terminating. If you do not specify this parameter, the command iterates until interrupted by Ctrl-C.
[-refresh-display {true|false}]- Toggle Screen Refresh Between Each Iteration-
Specifies the display style. If true, the command clears the display after each data iteration. If false, the command displays each data iteration below the previous one. The default is false.
[-show-flexgroup-as-constituents {true|false}]- Display Flexgroups as Constituents-
If the parameter is specified and if the value is true, it will display data for FlexVols and Flexgroup Constituents. Otherwise it will display data for FlexVols and Flexgroups.
Examples
cluster1::> qos statistics volume latency show -iterations 100 -rows 3 Workload ID Latency Network Cluster Data Disk Qos Max Qos Min NVRAM Cloud FlexCache SM Sync VA --------------- ------ -------- -------- -------- -------- -------- -------- ---------- ---------- ---------- ---------- ---------- ---------- -total- 110.35ms 110.02ms 0ms 327.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms vs1vol0 111 167.82ms 167.22ms 0ms 603.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms vol1 1234 117.76ms 117.56ms 0ms 191.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms vol2 999 44.24ms 44.05ms 0ms 190.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms -total- - 38.89ms 38.63ms 0ms 256.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms vol2 999 64.47ms 64.20ms 0ms 266.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms vol1 1234 27.28ms 27.03ms 0ms 253.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms vs1vol0 111 23.72ms 23.47ms 0ms 249.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms -total- - 409.81ms 409.65ms 0ms 169.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms vol1 1234 816.92ms 816.80ms 0ms 120.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms vol2 999 407.88ms 407.66ms 0ms 219.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms vs1vol0 111 3.68ms 3.49ms 0ms 193.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms
The example above displays latencies for the 3 volumes with the highest latencies and it refreshes the display 100 times before terminating.
cluster1::> qos statistics volume latency show -vserver vs0 -volume vs0_vol0 -iterations 100 Workload ID Latency Network Cluster Data Disk Qos Max Qos Min NVRAM Cloud FlexCache SM Sync VA --------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- -total- - 455.00us 158.00us 0ms 297.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms vs0_vol0-wid1.. 15658 428.00us 155.00us 0ms 273.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms -total- - 337.00us 130.00us 0ms 207.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms vs0_vol0-wid1.. 15658 316.00us 128.00us 0ms 188.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms -total- - 464.00us 132.00us 0ms 332.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms vs0_vol0-wid1.. 15658 471.00us 130.00us 0ms 341.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms -total- - 321.00us 138.00us 0ms 183.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms vs0_vol0-wid1.. 15658 302.00us 137.00us 0ms 165.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms -total- - 418.00us 142.00us 0ms 276.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms vs0_vol0-wid1.. 15658 424.00us 143.00us 0ms 281.00us 0ms 0ms 0ms 0ms 0ms 0ms 0ms 0ms
The example above displays latencies for volume vs0_vol0 in Vserver vs0 and it refreshes the display 100 times before terminating.