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
n
The value for the deviceLatency data counter is greater than 15 ms indicates that there are probably
problems with the storage array.
n
The queueLatency data counter measures above zero.
n
Spikes in latency.
n
Unusual increases in read/write requests.
Cause
n
The virtual machines on the host are trying to send more throughput to the storage system than the
configuration supports.
n
The storage array probably is experiencing internal problems.
n
The workload is too high and the array cannot process the data fast enough.
Solution
n
The virtual machines on the host are trying to send more throughput to the storage system than the
configuration supports. Check the CPU usage, and increase the queue depth.
n
Move the active VMDK to a volume with more spindles or add disks to the LUN.
n
Increase the virtual machine memory. It should allow for more operating system caching, which can
reduce I/O activity. Note: It may require you to increase the host memory. Increasing memory might
reduce the need to store data because databases can utilize system memory to cache data and avoid
disk access.
n
Check swap statistics in the guest operating system to verify that virtual machines have adequate
memory. Increase the guest memory, but not to an extent that leads to excessive host memory
swapping. Install VMware Tools so that memory ballooning can occur.
n
Defragment the file systems on all guests.
n
Disable antivirus on-demand scans on the VMDK and VMEM files.
n
Use the vendor's array tools to determine the array performance statistics. When too many servers
simultaneously access common elements on an array, the disks might have trouble keeping up.
Consider array-side improvements to increase throughput.
n
Use Storage vMotion to migrate I/O-intensive virtual machines across multiple hosts.
n
Balance the disk load across all physical resources available. Spread heavily used storage across
LUNs that are accessed by different adapters. Use separate queues for each adapter to improve disk
efficiency.
n
Configure the HBAs and RAID controllers for optimal use. Verify that the queue depths and cache
settings on the RAID controllers are adequate. If not, increase the number of outstanding disk
requests for the virtual machine by adjusting the Disk.SchedNumReqOutstanding parameter.
n
For resource-intensive virtual machines, separate the virtual machine's physical disk drive from the
drive with the system page file. This alleviates disk spindle contention during periods of high use.
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