Which Isilon feature provides the ability to build a cluster using different node types and tiers to meet a customer's business objectives?

A potential customer requires 4 PB of usable capacity to store media files. The workloads are a combination of streaming video delivery and long term archive of video assets.
There is very little space available in the customer's datacenter, so physical density is very important. The customer is concerned about performance impact and potential data loss when using 3 TB or larger drives.
What Isilon capabilities can address the customer's concerns?

An Isilon has two ports configured per node. Each port is on a different VLAN. Although incoming traffic is evenly distributed, transmitted data from the Isilon uses one port more than the other port. What could be the cause of this imbalance?

Which type of antivirus scan is unsupported by Isilon OneFS?

Which feature of OneFS is used in the Home Directory and File Share vertical to monitor storage and media clients for optimal performance?