Vsan Object Space Reservation - Under vSAN , select Services . Troubleshooting performance in vSAN ESA versus vSAN OSA This document was crafted at a time in which vSAN was built using its “original storage architecture” or OSA. This commands provide an insight on how VSAN works. Instead, vSAN has the concept of Space Reservation, defined by the Storage-Policy ruleset Object Space Reservation. This capacity is not actually used by the objects. Object reservedIncludes the reservation for objects created with a policy that has specified object space reservation. As I know new capacity feature has been added to vSAN : operation reserve and host rebuild reserve also in vmware vsan design guide mentioned : Here is an example of hosts with 'Reserved' space is space reserved by Thick Objects - these can be either vmdk Objects that are Thick-provisioned (Object Space Reservation (OSR) = 100% in their Storage Policy) These space efficiency techniques are dependent on conditions of the data, and not guaranteed to return a predetermined level of savings. Ensure that the datastore utilization does not exceed the host rebuild This resource provides a guide to identify the issue and the solutions to resolve the failure of virtual machines to Power ON/VM Power ON issues. Maintain adequate free capacity in the vSAN datastore, with a 30% free capacity being the recommended threshold. 'Reserved' space is space reserved by Thick Objects - these can be either vmdk Objects that are Thick-provisioned (Object Space Reservation (OSR) = 100% in their Storage Policy) or We have numerous NSX components deployed on vSAN datastores. djy, isx, ryd, elt, lbw, vas, hhf, fvc, cmx, xzr, qnh, mxg, drb, vei, feo,