Quoting from the Storwize official announcement:
Storwize Inc., the only provider of primary storage data compression solutions, today announced it has joined the VMware Technology Alliance Partner (TAP) program.
Field-tested installations running VMware and Storwize solutions achieve compression ratios between 60 to 80 percent, resulting in reduced CPU, memory, and disk utilization. In addition to simply freeing up primary storage, and delaying the purchase of new hardware, Storwize allows more virtual machines or more instances of ESX Server to run on the same NAS device. VMware users backing up virtual machine disk (VMDK) files will find Storwize data reduction technology similarly shrinks backup loads and backup windows, working throughout the data lifecycle…