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 1‑97. Data Counters
Chart Label Description
Usage Amount of actively used virtual CPU as a percentage of total available CPU.
CPU usage is the average CPU utilization over all available virtual CPUs in the virtual machine.
For example, if a virtual machine with one virtual CPU is running on a host that has four physical CPUs and the
CPU usage is 100%, the virtual machine is using one physical CPU completely.
virtual CPU usage = usagemhz ÷ (number of virtual CPUs × core frequency)
Note This is the host's view of the CPU usage, not the guest operating system view.
n
Counter: usage
n
Stats Type: Rate
n
Unit: Percentage (%). Precision is to 1/100%. A value between 0 and 100.
n
Rollup Type: Average (Minimum/Maximum)
n
Collection Level: 1 (4)
Ready Percentage of time that the virtual machine was ready, but could not get scheduled to run on the physical CPU.
CPU ready time is dependent on the number of virtual machines on the host and their CPU loads. At collection level
1, the average CPU ready time of all virtual CPUs on the virtual machine is displayed. At collection level 3, the
average CPU ready time of each virtual CPU is also displayed.
n
Counter: ready
n
Stats Type: Rate
n
Unit: Percentage (%)
n
Rollup Type: Summation
n
Collection Level: 1
Chart Analysis
A short spike in CPU usage or CPU ready indicates that you are making the best use of the virtual
machine resources. However, if the CPU usage value for a virtual machine is above 90% and the CPU
ready value is above 20%, performance is being impacted.
If performance is impacted, consider taking the following actions.
Table 1‑98. 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 Compare the CPU usage value of a virtual machine with the CPU usage of other virtual machines on the host or in the
resource pool. The stacked line chart on the host's Virtual Machine view shows the CPU usage for virtual machines on the
host.
4 Determine whether the high ready time for the virtual machine resulted from its CPU usage time reaching the CPU limit
setting. If so, increase the CPU limit on the virtual machine.
5 Increase the CPU shares to give the virtual machine more opportunities to run. The total ready time on the host might remain
at the same level if the host system is constrained by CPU. If the host ready time doesn't decrease, set the CPU reservations
for high-priority virtual machines to guarantee that they receive the required CPU cycles.
6 Increase the amount of memory allocated to the virtual machine. This decreases disk and or network activity for applications
that cache. This might lower disk I/O and reduce the need for the host to virtualize the hardware. Virtual machines with
smaller resource allocations generally accumulate more CPU ready time.
vSphere Monitoring and Performance
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