vSAN PMem Performance Graphs in vSphere Web Client
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vSAN PMem Performance Graphs in vSphere Web Client

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Article ID: 326555

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Updated On:

Products

VMware vSAN

Issue/Introduction

This article explains vSAN Performance Graphs for PMem storage, available in vSAN (formerly known as Virtual SAN) 8.0 and later.
For older graphs in vSAN 6.2 and later see: vSAN Performance Graphs in the vSphere Web Client Part 1.

PMem metrics collection settings are defined by vCenter Server Statistics Settings. By default, only the Level 1 metrics are collected and stored.


Resolution

To view all PMem metrics for a longer period, change statistics collection level configuration in vSphere General Settings dialog.

Note: When you increase the collection level, the storage and system requirements might change. You might need to allocate more system resources to avoid a decrease in the performance. 
For troubleshooting purpose, you can consider changing the metrics level collection settings, if you are facing a potential PMem performance issue. You can then change the values back to default, if you do not have the resources to keep the additional metrics for a longer period.

Cluster performance

IOPS

This graph shows iOPS consumed by all VM(s) placed on the PMem datastores of all host of this cluster.

MetricsMetric LevelMetric DescriptionMetric ID in APICorresponding Entity Type
Read IOPS1Read IOPS consumed by all VM(s) on the PMem datastores of all hosts.iopsReadcluster-pmem
Write IOPS2Write IOPS consumed by all VM(s) on the PMem datastores of all hosts.iopsWritecluster-pmem
Total IOPS2Total IOPS consumed by all VM(s) on the PMem datastores of all host.iopsTotalcluster-pmem
 

Latency

This graph shows average latency of IOs generated by all VM(s) placed on the PMem datastores of all hosts of this cluster.

MetricsMetric LevelMetric DescriptionMetric ID in APICorresponding Entity Type
Read Latency3Average read latency of IOs generated by all VM(s) on the PMem datastores of all hosts of this cluster.latencyRead

cluster-pmem

Write Latency

3

Average write latency of IOs generated by all VM(s) on the PMem datastores of all hosts of this cluster.

latencyWritecluster-pmem
 

Bandwidth

This graph shows bandwidth consumed by all VM(s) placed on the PMem datastores of all hosts of this cluster.

MetricsMetric LevelMetric DescriptionMetric ID in APICorresponding Entity Type

Read Bandwidth

1

Read bandwidth consumed by all VM(s) on the PMem datastores of all hosts of this cluster.

bandwidthRead

cluster-pmem

Write Bandwidth

2

Write bandwidth consumed by all VM(s) on the PMem datastores of all hosts of this cluster.

bandwidthWrite

cluster-pmem

Total Bandwidth

2

Total bandwidth consumed by all VM(s) on the PMem datastores of all hosts of this cluster.

bandwidthTotal

cluster-pmem

Host performance

IOPS

This graph shows iOPS consumed by all VM(s) placed on the PMem datastore of this host.

MetricsMetric LevelMetric DescriptionMetric ID in APICorresponding Entity Type
Read IOPS1Read IOPS consumed by all VM(s) on the PMem datastore of this host.iopsReadhost-pmem
Write IOPS2Write IOPS consumed by all VM(s) on the PMem datastore of this host.iopsWritehost-pmem
Total IOPS2Total IOPS consumed by all VM(s) on the PMem datastore of this host.iopsTotalhost-pmem
 

Latency

This graph shows average latency of IOs generated by all VM(s) placed on the PMem datastore of this host.

MetricsMetric LevelMetric DescriptionMetric ID in APICorresponding Entity Type
Read Latency3Average read latency of IOs generated by all VM(s) on the PMem datastore of this host.latencyReadhost-pmem
Write Latency3Average write latency of IOs generated by all VM(s) on the PMem datastore of this host.latencyWritehost-pmem
 

Bandwidth

This graph shows bandwidth consumed by all VM(s) placed on the PMem datastore of this host.

MetricsMetric LevelMetric DescriptionMetric ID in APICorresponding Entity Type
Read Bandwidth1Read bandwidth consumed by all VM(s) on the PMem datastore of this host.bandwidthReadhost-pmem
Write Bandwidth2Write bandwidth consumed by all VM(s) on the PMem datastore of this host.bandwidthWritehost-pmem
Total Bandwidth2Total bandwidth consumed by all VM(s) on the PMem datastore of this host.bandwidthTotalhost-pmem