Repeated alerts of disconnect/reconnect & Path down to empty Datastores after 6.0

We recently upgraded our vCenter and hosts to 6.0 and we are migrating off a vBlock system that uses EMC VNX onto newer linked vcenter that

uses vxRack system with and different storage vendor (can't recall vendor at present). We have been receiving multiple storage alerts for path

down to luns and disconnect / reconnect notices since the upgrade of the old system.

After migrating all vm's out a cluster out of retiring vCenter and into the new linked environment we placed the old hosts into maintenance mode

as that cluster is now empty. We have kept them in maint. mode to verify all info in the event of issues after migration to new system.

We have verified all the datastores connected to those specific hosts are now empty but are showing SIOC I/O workload errors even though

they are empty and can see no outside connections to those datastore.

Have verified no issues present on Cisco UCS blades and no issues alerting from within the VNX and there has been no hardware work

or network issues to the racks in the datacenter areas where that hardware is present.

Should we

a: Remove the old hosts from vCenter hoping the alerts for those will stop.

b. un-present the Datastores that are alerting from those hosts in the old cluster.

And Yes I have read the following and have called support but since it is a multiple type issue... I was hoping someone might be able to provide

some info

Thanks for any suggestions!!!