vSAN Performance Top Contributors

Products

• VMware vSAN

Issue/Introduction

This article explains vSAN Top Performance Contributors Graphs, available in vSAN 7.0 U2 and later.

Environment

VMware vSAN 7.0.x

Resolution

To get vSAN performance top contributors graphs/charts first, you need to enable the vSAN performance service.
You can view the top contributors of the whole vSAN cluster, the graphs include two entity types: virtual machines and the disk group.
There are multiple metrics graphs you can monitor to know vSAN performance top contributors. Here are the details of all available vSAN performance top contributors graphs
-------------------------------------------------------------------------------------------------------------------------------------------------

Cluster level metrics

The cluster-level metrics graph provides the cluster VMs' overall information of latency, IOPS, and throughput, you can click the line in the line chart to view the performance top contributor at that timestamp.

Latency

This graph shows the average latency of IOs generated by all vSAN clients in the cluster, such as virtual machines, stats objects, etc.

Metrics	Metrics Description
Read Latency	Average read latency of IOs generated by all vSAN clients in the cluster, such as virtual machines, stats object, etc.
Write Latency	Average write latency of IOs generated by all vSAN clients in the cluster, such as virtual machines, stats object, etc.

 

IOPS

This graph shows iOPS consumed by all vSAN clients in the cluster, such as virtual machines, stats object, etc.

Metrics	Metrics Description
Read IOPS	Read IOPS consumed by all vSAN clients in the cluster, such as virtual machines, stats object, etc.
Write IOPS	Write IOPS consumed by all vSAN clients in the cluster, such as virtual machines, stats object, etc.

Throughput

This graph shows the throughput consumed by all vSAN clients in the cluster, such as virtual machines, stats object, etc.

Metrics	Metrics Description
Read Throughput	Read Throughput consumed by all vSAN clients in the cluster, such as virtual machines, stats object, etc.
Write Throughput	Write Throughput consumed by all vSAN clients in the cluster, such as virtual machines, stats object, etc

 
-------------------------------------------------------------------------------------------------------------------------------------------------

Top VM contributors

You can view the virtual machine top contributor of the metrics latency, IOPS, and throughput at some timestamp.

IOPS

This graph shows the virtual machine IOPS.

Metrics	Metrics Description
Read IOPS	The virtual machine read IOPS
Write IOPS	Virtual machine write IOPS

 

Throughput

This graph shows virtual machine throughput

Metrics	Metrics Description
Read Throughput	The virtual machine read Throughput
Write Throughput	Virtual machine write Throughput

 

Latency

This graph shows the virtual machine latency.

Metrics	Metrics Description
Read Latency	The virtual machine read Latency
Write Latency	Virtual machine write Latency

 
-------------------------------------------------------------------------------------------------------------------------------------------------

Top Disk group contributors

You can view the disk group top contributor of the metrics latency IOPS, and throughput at some timestamp

Frontend(Guest) IOPS

This graph shows the vSAN disk group (cache tier disk) frontend IOPS.

Metrics	Metrics Description
Frontend Read IOPS	vSAN disk group (cache tier disk) frontend read IOPS including RC read misses.
Frontend Write IOPS	vSAN disk group (cache tier disk) frontend write IOPS.

 

Frontend(Guest) Throughput

This graph shows the vSAN disk group (cache tier disk) frontend(guest) Throughput

Metrics	Metrics Description
Frontend Read Throughput	vSAN disk group (cache tier disk) frontend read throughput.
Frontend Write Throughput	vSAN disk group (cache tier disk) frontend write throughput

 

Frontend(Guest) Latency

This graph shows the vSAN disk group (cache tier disk) frontend(guest) latency.

Metrics	Metrics Description
Frontend Read Latency	vSAN disk group (cache tier disk) frontend read latency
Frontend Write Latency	vSAN disk group (cache tier disk) frontend write latency