For example, if each server accesses a separate unique LUN, while a second adapter would add more bandwidth, you might not see a performance improvement. This would be the case if the LUN is being accessed via a single adapter path as well as if the adapter or the LUN are not the bottlenecks. Another example would occur if each server accesses multiple LUNs. If the LUNs are load balanced across adapters, there is the potential for performance improvement.
You should also consider what other traffic exists on the SAN and the switches. Exercise caution when configuring second adapters (storage or network NICs) on the same PCI bus to avoid bus contention.
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