Quantum| Collecting an ESX Performance Snapshot |
The logs that you collect from the vCenter and ESX host do not include performance statistics/snapshots. But you can use the information in this section to collect performance snapshots. This information is also available in the VMware Knowledge Base (http://kb.vmware.com/kb/1967).
Note: If you collect performance statistics logs, you need to have an ESX host to read them.
Performance snapshots are continuous snapshots of proc nodes, collected at defined intervals for a specified period. VMware Technical support may ask customers to send performance snapshots to help troubleshoot a performance issue in response to a service request that a customer opened.
To collect the performance snapshots:
• ESX/ESXi 4.1 and earlier releases: vm-support -s
• ESXi 5.0: vm-support -p
You may specify the collection duration and interval in seconds, using these command-line options:
• ESX/ESXi 4.1 and earlier releases: vm-support -s -d <duration> -i <interval>
Note: If you want to collect only performance snapshots, without the regular data, use uppercase -S instead of lowercase -s.
• ESXi 5.0: vm-support -p -d <duration> -i <interval>
If an interval is not specified, vm-support automatically sets the interval period to twice the amount of time taken to collect a single snapshot. For most cases, VMWare recommends that you set the interval period to 10 seconds.
The collected snapshots are bundled with regular data collected by vm-support, and a tar archive is created in /var/tmp/esx-2010-01-26--20.46.3236587.tgz.
It is important that you use the vm-support script to capture performance snapshots when your system is experiencing a performance problem. The script cannot collect useful data otherwise.
If the snapshot collection interval overlaps with a time when the virtual machine is not experiencing a performance problem, the result may skew the data collected and can make analysis difficult.
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