see update manager admin guide(http://www.vmware.com/pdf/vi3_vum_10_admin_guide.pdf), p13,
"The amount of space required to store the updates on the server on which the Download Service is installed
varies based on the number of different operating systems and applications you will be patching and the
number of years you will be gathering patches on this system. Expect to need 50 gigabytes (GB) for each year
of ESX Server patching and 11GB for each virtual machine operating system and locale combination."
also a estimator for this: http://www.vmware.com/support/vi3/doc/vi3_vum_10_sizing_estimator.xls
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Idleness is not doing nothing. Idleness is being free to do anything.
