Based on that, I would not bother setting up a cache partition on the VMAX.  If the data is active, it will be in cache anyway.  There is a feature in Symmetrix that allows you to setup cache partitions and put devices into them, without actually enforcing the limits.  This along with DCP partition stats can give you insight into how much cache a group of volumes is using without impacting performance. You could do this on the DMX4, as long as you are running at least 5772 code or higher.   I also am generally against isolating things from one another unless there is a really good reason.  You will get the best performance from the Symm if you don't isolate disks, cache, engines, etc from one another.  However there are some very strong cases for isolation, such as backup to disks where the disks are SATA and RAID6.  That is a perfect case for DCP.
Hi guys,  I need to size up a cache partition for some LUNs concerning a particular application.  What can I measure (in Ionix Performance Manager for example) to reach the goal? How can I use these measures?  Many thanks
Dynamic Cache Partitioning (DCP) sizing