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Flying Circus Status - VM performance and stability issues
"After checking the virtualisation servers we saw that many of them had too many virtual machines assigned to them, consuming much more memory than the host actually had. "
"Looking at the algorithm that performed the evacuation when maintenance was due, we found that it located virtual machines to the best possible server. What it did not do was to prohibit machines being placed on hosts that already have too many machines. "
postmortem 
october 2015 by peakscale
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