An existing IBM San Volume Controller DH8 cluster consists of two I/O groups with DH8 nodes running IBM Spectrum Virtualize 7.6. Performance analysis shows the cluster requires significant additional memory for the I/O workload. What is the first step the technical specialist should recommend?
A. Upgrade the cluster to the recommended level of code
B. Replace the existing cluster DH8 nodes with SV1 nodes
C. Expand the cluster to 4 I/O groups using DH8 nodes
D. Add additional memory to the existing DH8 nodes
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