you are only focussing on the access perspective and not on the backend.  ECS and Isilon are completely different when it Comes to replication. ECS and Isilon are completely different, when you want to have something "global". The Isilon can scale in a Cluster but if you Need the data "around the world" you will have a lot of Problems with syncs  Isilon does only "1:n" Replication with Write --> Read async ECS is more softwarebased replication with all write in different datacenters.  It just depends on what you want to do and what you want to achieve.  If you want to host a lot of data in ONE Datacenter and just need the named protocols go with isilon If you want to host a lot of data in SEVERAL Datacenters and need geo-loadbalancing and active-active-active configurations go with ECS  Furthermore Isilon is more a "Filecentric" solution which offers you access to files through different protocols while ECS is "Objectstorage" which offers you acces to objects through several protocols, this said ECS has WORM by design.
Hello Guys,  Isilon can support all modern data center protocols like HTTP , Rest API, HDFS etc,. Along with that it can support SMB and NFS as  NAS storage. Except the remotely anywhere access feature isilon can support all the features where ECS does.   With that all being said, what are the necessity and advantage does ECS contains in par with Isilon from techinical perspective ?    ThanksSaran
Isilon Vs ECS