Questions on R-Series 5800s

Hello...Trying to bring up a new 5800

1. What is the recommendation for port-channel. Can we create port-channel between two different pipelines?

i.e Ports 3.0,4.0,5.0 and 6.0 are in Pipeline-1 and Ports 7.0,8.0,9.0 and 10.0 are in pipeline-2. Can we create a LAG with 3.0 and 7.0? Plan on using a 10G link for HA and was planning to convert 6.0 to 10G and connect between two R-series

 2. When deploying a tenant, Should we just leave it as "Recommended" for Provisioning instead of "Advanced" and have 18 vCPUs if plan on having just one tenant. Not sure how much Virtual disk size is recommended.

Any recommendation for Virtual Disk Size?

3. If we want to have additional tenant, is it best to leave the tenant at 14 vCPU or can we change it later and What is the impact? Just existing tenant restart?