Datastore usage is higher than shown on array
Article ID: 314355
Updated On:
Products
VMware vSphere ESXi
Issue/Introduction
The display in vCenter, on the host UI, and the df output matches, but the array display shows a lower amount of used space.
Resolution
This is expected as most modern storage arrays have space saving technologies. These savings are invisible to the hosts and vCenter, and are therefore not accounted for at that layer.
Some examples of these technologies:
Thick provision - lazy zero
Zero block discard
Deduplication
Compression
If you are concerned that these numbers are inaccurate, compare the total file usage shown by "du" to the output of "df". These will not be identical, but should be close to each other. This can then be compared to the host UI and vCenter display.
Some examples of these technologies:
Thick provision - lazy zero
Zero block discard
Deduplication
Compression
If you are concerned that these numbers are inaccurate, compare the total file usage shown by "du" to the output of "df". These will not be identical, but should be close to each other. This can then be compared to the host UI and vCenter display.
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