IN general terms, no, don't expect to get more than 120MB/sec throughout for a single disk on a VM. You can do clever stuff like manually balancing paths to different data stores to get increased throughput for a VM with multiple disks, or some other settings, but you have more fundamental problems here. I don't know equal pic arrays so can't advise on that. If you have local storage on your host, as a test you can storage vmotion your vmdk to that to see if throughput increases, proving nets storage array or network.
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