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Server reverted to may after reboot

I just had a problem on a client's server, it wasn't responding to anything so I forced a reboot. The client called shortly after to say the website reverted to a version from May. Checked the backups ...
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SAR returns 0 await, 0 util for mdraid volume

Trying to get a picture on what is going on with the disks in our environment, I'm gathering statistics using SAR. Why does "sar -d" return "0" for the await and util for an mdraid volume? I can see ...