The default value is 300 seconds.
The value must be between 30 seconds and 1500 seconds.
To edit the value:
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Log in to the ESX host or VirtualCenter using the Virtual Infrastructure Client. If you log in to VirtualCenter, select the ESX Server to be modified.
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Click on the Configuration tab.
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Click Advanced Settings.
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Click Disk.
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Update the Disk.PathEvalTime field.
Note: This change has to be made to each ESX host.