When executing WSMAN commands, sometimes but rarely you will hit a timing window where the iDRAC is processing other information in the background, Lifecycle Controller(LC) is not ready or the server is not available. If you see a WSMAN command fail again in the future, try to execute the command again. Also, you can check the status of LC/server by running an invoke command on GetRemoteServicesAPIStatus method.
Since you are creating multiple VDs along with reset controller and want to execute one command, I would suggest using WSMAN feature "System Configuration XML"(introduced in iDRAC 1.30.30) to simplify your workflow. You can make all your RAID changes in one xml(reset config and create multiple VDs) and only need to invoke one command. Refer to attached whitepaper below which gives an overall of this feature along with workflow examples. Also i attached a link to a video with goes through a workflow of using this feature.
Whitepaper -
en.community.dell.com/.../20269601.aspx
Workflow video using System Configuration XML -
(Please visit the site to view this video)
Thanks