Good Post by Enrico Signoretti (thank you)
EMC Symmetrix was introduced in 1990 (as a Mainframe storage) and it has quickly become one of the most successful enterprise Tier1 storage ever (Now the VMAX). It’s big (now supporting up to 3200 disks and 2048GB of cache) but its architecture is outdated and so are its features. What was good enough to sustain Mainframe and large Unix server workloads is no longer when having to manage thousands (or tens of thousands) of VMs.
Read on here