6.7
Table Of Contents
- vSphere Monitoring and Performance
- Contents
- About vSphere Monitoring and Performance
- Monitoring Inventory Objects with Performance Charts
- Performance Chart Types
- Data Counters
- Metric Groups in vSphere
- Data Collection Intervals
- Data Collection Levels
- View Performance Charts
- Performance Charts Options Available Under the View Menu
- Overview Performance Charts
- Clusters
- Data centers
- Datastores and Datastore Clusters
- Disk Space (Data Counters)
- Disk Space (File Types)
- Disk Space (Datastores)
- Disk Space (Virtual Machines)
- Space Allocated by Datastore in GB
- Space Capacity by Datastore in GB
- Storage I/O Control Normalized Latency
- Storage I/O Control Aggregate IOPs
- Storage I/O Control Activity
- Average Device Latency per Host
- Maximum Queue Depth per Host
- Read IOPs per Host
- Write IOPs Per Host
- Average Read Latency per Virtual Machine Disk
- Average Write Latency per Virtual Machine Disk
- Read IOPs per Virtual Machine Disk
- Write IOPs Per Virtual Machine Disk
- Virtual Machine Observed Latency per Datastore
- Hosts
- Resource Pools
- vApps
- Virtual Machines
- CPU (%)
- CPU Usage (MHz)
- Disk (Average)
- Disk (Rate)
- Disk (Number)
- Virtual Disk Requests (Number)
- Virtual Disk Rate (KBps)
- Memory (Usage)
- Memory (Balloon)
- Memory (Swap Rate)
- Memory (Data Counters)
- Network (Usage)
- Network (Rate)
- Network (Packets)
- Disk Space (Data Counters)
- Disk Space (Datastores)
- Disk Space (File Types)
- Fault Tolerance Performance Counters
- Working with Advanced and Custom Charts
- Troubleshoot and Enhance Performance
- Monitoring Guest Operating System Performance
- Monitoring Host Health Status
- Monitoring vSphere Health
- Monitoring Events, Alarms, and Automated Actions
- View Events
- View System Logs
- Export Events Data
- Streaming Events to a Remote Syslog Server
- Retention of Events in the vCenter Server Database
- View Triggered Alarms and Alarm Definitions
- Live Refresh of Recent Tasks and Alarms
- Set an Alarm in the vSphere Web Client
- Set an Alarm in the vSphere Client
- Acknowledge Triggered Alarms
- Reset Triggered Event Alarms
- Preconfigured vSphere Alarms
- Monitoring Solutions with the vCenter Solutions Manager
- Monitoring the Health of Services and Nodes
- Performance Monitoring Utilities: resxtop and esxtop
- Using the vimtop Plug-In to Monitor the Resource Use of Services
- Monitoring Networked Devices with SNMP and vSphere
- Using SNMP Traps with vCenter Server
- Configure SNMP for ESXi
- SNMP Diagnostics
- Monitor Guest Operating Systems with SNMP
- VMware MIB Files
- SNMPv2 Diagnostic Counters
- System Log Files
- View System Log Entries
- View System Logs on an ESXi Host
- System Logs
- Export System Log Files
- ESXi Log Files
- Upload Logs Package to a VMware Service Request
- Configure Syslog on ESXi Hosts
- Configuring Logging Levels for the Guest Operating System
- Collecting Log Files
- Viewing Log Files with the Log Browser
- Enable the Log Browser Plug-In on the vCenter Server Appliance
- Enable the Log Browser Plug-In on a vCenter Server Instance That Runs on Windows
- Retrieve Logs
- Search Log Files
- Filter Log Files
- Create Advanced Log Filters
- Adjust Log Times
- Export Logs from the Log Browser
- Compare Log Files
- Manage Logs Using the Log Browser
- Browse Log Files from Different Objects
Table 1‑45. CPU Performance Enhancement Advice (Continued)
# Resolution
5 Upgrade the physical CPUs or cores on the host if necessary.
6 Use the newest version of hypervisor software, and enable CPU-saving features such as TCP Segmentation Offload, large
memory pages, and jumbo frames.
CPU (MHz)
The CPU (MHz) chart displays CPU usage for the host.
This chart is located in the Home view of the Host Performance tab.
Table 1‑46. Data Counters
Chart Label Description
Usage The sum, in megahertz, of the actively used CPU of all powered on virtual machines
on a host.
The maximum possible value is the frequency of the processors multiplied by the
number of processors. For example, if you have a host with four 2GHz CPUs running a
virtual machine that is using 4000MHz, the host is using two CPUs completely.
4000 ÷ (4 × 2000) = 0.50
n
Counter: usagemhz
n
Stats Type: Rate
n
Unit: MegaHertz (MHz)
n
Rollup Type: Average (Minimum/Maximum)
n
Collection Level: 1 (4)
Chart Analysis
A short spike in CPU usage indicates that you are making the best use of the host resources. However, if
the value is constantly high, the host is probably lacking the CPU required to meet the demand. A high
CPU usage value can lead to increased ready time and processor queuing of the virtual machines on the
host.
If performance is impacted, consider taking the following actions.
Table 1‑47. CPU Performance Enhancement Advice
# Resolution
1 Verify that VMware Tools is installed on every virtual machine on the host.
2 Set the CPU reservations for all high-priority virtual machines to guarantee that they receive the CPU cycles required.
3 Reduce the number of virtual CPUs on a virtual machine to only the number required to execute the workload. For example, a
single-threaded application on a four-way virtual machine only benefits from a single vCPU. But the hypervisor's maintenance
of the three idle vCPUs takes CPU cycles that could be used for other work.
4 If the host is not already in a DRS cluster, add it to one. If the host is in a DRS cluster, increase the number of hosts and
migrate one or more virtual machines onto the new host.
vSphere Monitoring and Performance
VMware, Inc. 41