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Knowledge Base

vCenter Update Manager host tasks might fail in slow networks (1021050)

Last Updated: 3/24/2017Categories: TroubleshootingTotal Views: 14369Language:
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Details

Symptom
If you run vCenter Update Manager over a low-bandwidth, high-latency, or lossy network, host operations might time out or fail. These operations include host patch and extension scanning, staging, and remediation, as well as host upgrade remediation tasks. The default timeout value for tasks performed and managed by vCenter Server is 15 minutes. Timeout might also occur under normal network conditions if the vCenter Update Manager operation takes more than 15 minutes to complete.

Reasons
When vCenter Update Manager performs host operations on a remote ESX/ESXi host, the operations might time out or fail if the connection between vCenter Server and the ESX/ESXi host is slow. The task timeout or failure might occur because of the following reasons:

The connection to the vCenter Update Manager server times out.

The connection to vCenter Server times out.

This article introduces the methods of setting timeouts for various releases of vCenter Update Manager, and estimating timeouts for host tasks.

Note: If you are working in a slow network, and host tasks take more than two hours, you should upgrade vCenter Update Manager to Update Manager 4.0 Update 2, Update Manager 4.1 or later. For more information about timeout periods in Update Manager, see Figure 1.

For general information about vCenter Server timeout settings, see vCenter operation times out with the error: Operation failed since another task is in progress (1004790).

Solution

Troubleshoot network timeouts in vCenter Update Manager 4.0 Update 1 and earlier versions
The default timeout period for vCenter Update Manager 4.0 Update 1 and earlier versions is two hours (7,200 seconds) and cannot be changed.

The default timeout period for vCenter Server tasks is 15 minutes. To increase the vCenter Server timeout, perform the following steps:

Log in as an administrator to the machine on which vCenter Server is installed.

Open the vpxd.cfg file in a text editor.

The default location is C:\Documents and Settings\All Users\Application Data\VMware\VMware VirtualCenter\vpxd.cfg.

Include these lines before the tag:

7200

7200

If the tag already exists in the file, add the timeout (>7200>) in the existing tag, rather than create a new tag.

Restart the vCenter Server service. For more information, see Stopping, starting, or restarting vCenter services (1003895).

Log in to the ESX/ESXi host with root privileges using the console or an SSH session.

For more information about troubleshooting SSH connections to ESX hosts, see Unable to connect to an ESX host using Secure Shell (SSH) (1003807).

For more information about troubleshooting ESXi hosts, see Tech Support Mode for Emergency Support (1003677) for 4.x and below. For ESXi 4.1 and above see Using Tech Support Mode in ESXi 4.1 and ESXi 5.x (1017910).

On the ESX/ESXi host, open the /etc/opt/vmware/vpxa/vpxa.cfg in a text editor.

Include the following lines before the tag:

7200

7200

If the tag already exists in the file, add the timeout (>7200>) in the existing tag, rather than create a new tag.

Troubleshoot slow network issues in vCenter Update Manager 4.0 Update 2, vCenter Update Manager 4.1 and later
For vCenter Update Manager 4.0 Update 2, vCenter Update Manager 4.1 and later, no action is required and all host operations complete without any errors. In vCenter Update Manager 4.0 Update 2, vCenter Update Manager 4.1 and later, you can change the default timeout for vCenter Update Manager by using the tag in the vci-integrity.xml file. For more information, see Extend the default timeout periods for vCenter Server, ESX/ESXi hosts, and vCenter Update Manager (1017253).

The time for host operations varies from several minutes (in LAN environments) to several hours (in WAN environments). You can estimate staging or remediation periods in various WAN environments.

Table 1 lists typical WAN environments, such as dial-up, DSL, and satellite, with varying bandwidth, latency, and so on.

Network

Bandwidth

Latency

Error rate

Dial-up 1

64Kbps

250ms

0.05%

Dial-up 2

256Kbps

250ms

0.05%

DSL

512Kbps

100ms

0.05%

Satellite

1.5Mbps

500ms

0.10%

T1

1.5Mbps

100ms

0.05%

Table 1. Typical network parameters in WAN

The maximum durations of the longest host operations for ESX/ESXi hosts in various network environments are illustrated in Figure 1.

Figure 1. Maximum host operation time for ESX/ESXi hosts.

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