Illegal Request error with unmap on vmware
when you use unmap to reclaim space, this task should be done on LUNs in this case on VSAN. I see on your images that linux servers is trying to run fstrim but it is not necessary. On vmware, you can configure space reclamation, select your LUN, configure, general and set space reclamation automatic. Another question, why you present ISCI luns with vsan? Whats use case?