Over the weekend I had maintenance time to take down all of our VM’s for troubleshooting purposes, when I started a single application server I could see peaks of almost 1k IOPS from just that VM alone. Initially my first thought was it was an issue with either the firmware on the Dell Equallogic or the Dell N4032 10Gbe switches and I logged a call with them, however the read activity just didnt add up. The thing that struck me the most was the imbalance in level of read traffic compared to write, as this jumped up to a massive 92% for read traffic. Following a recent firmware upgrade on our Dell Equallogic SAN I was horrified to see a massive spike in read IO activity, growing from an average of 2-3k IOPS right up to the maximum system limit on our SAN of 10k.
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