RAID Controller on IBM hosts System x3850 x5 7145 AC1 is the cause of high latencies

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If customer is using IBM System x3850 x5 7145 AC1 VMware hosts, then despite high cache hit ratio with VirtuCache, performance improvement is not seen versus a slow SAN based appliance, because driver latencies (both read and write) in the RAID controller are high. This is a problem with the firmware on the RAID controller that IBM needs to update. The other option is to use a PCIe Flash card since this IBM host has 7 PCIe slots.

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