pc99096,  The write and read cache numbers reported are indicating the memory dedicated for RAID cache. The rest of the memory on the system is shared between "front end" read cache and the Unisphere management processes.  Also, memory needs to be reserved on the peer Storage Processor for failover purposes so the processes on the failed Storage Processor can run on the surviving Storage Processor.  pdkilian,  The latest version of VNXe will create new VMware NFS applications with caching disabled. This is the best practice, and will help performance significantly for VMware workloads. If you have VMware NFS applications that were created before the best practices fix, you should manually modify the application's settings to disable caching  for best performance.
i'm just wondering how the memory in the vnxe3100 is being used. the system comes with dual controller, 8GB per controller, but each controller has only 128MB read and 768MB write cache allocated (at least this is what unisphere says). is it ok? is there any way to increase those values? if not, what is the rest of the memory used for?
vnxe3100 cache/memory size