How long does your IO take ?

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Oracle Linux engineer Rajan Shanmugavelu illustrates how to analyse disk IO latency using Dtrace.   There are times despite having a Highly Available and Fault Tolerant architected storage environment, the disk IO takes an abnormally longer time to complete, potentially causing outages at different levels in a data center. This becomes critical in a Cluster with multiple nodes that are using disk heartbeat…
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