One of the new features of vSphere 5.1 was the SSD monitoring and I/O Device Management features which I discussed in this post. I was doing some further testing on this recently and noticed that a number of fields from my SSD were reported as N/A. For example, I ran the following command against a local SSD drive on my host and these were the statistics returned.
The smartd collects information from ATA devices, but if the device does not provide a value for a particular attribute, then we will show N/A. It is very well possible that this SSD device is not be providing those values.
It should be noted that bespoke plugins from the various drive vendors can also be added to vSphere 5.1 to display specific capabilities and attributes for their own drives.
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