Expandable Reservation
Example 2
Assume a parent resource pool RP-MOM
has a reservation of 6GHz and one running virtual machine VM-M1 that reserves 1GHz. RP-MOM
also has a child resource pool RP-KID with a reservation of 2GHz and with
Expandable Reservation
selected. RP-KID contains two
virtual machines, VM-K1 and VM-K2, with reservations of 2GHz each.When a user powers on VM-K1, it can reserve
the resources it needs directly from RP-KID (which has 2GHz). When the user tries to
power on VM-K2, RP-KID has already allocated its 2GHz reservation to VM-K1, but it has
Expandable Reservation
configured, so it tries to borrow
resources from RP-MOM's reservation. RP-MOM has 6GHz minus 1GHz (reserved by VM-M1)
minus 2GHz (reserved by RP-KID), which leaves 3GHz of RP-MOM's reservation that is not
reserved by other resource pools or virtual machines in RP-MOM. With 3GHz available,
VM-K2 is able to power on.Admission Control with Expandable Resource Pools, Scenario
1
