Pci resource management

PCI_resize_Design.png

a) Same PCI had different Objects, one in the stats and another in the instance b) when RESIZE secondary host get other instances Objects

Resize:

  -> new host claim  -> old host stop (instance going to new HOST)->  new host starting new instance

Confirm:

   new machine call source machines’s  drop_resize_claim ( a new resource tracker been setting up)

Aborting:

   new:  stop new instance, drop claim -- >  old: reverting old status and stating machine

_{problem 1: 'claimed' status must be used to keep old device on source machine. we use node_id, not hostname, so use claimed status to keep out other machine's device out. solution A: get compute node from instance's hostname --> get compute_node_id risk: always reading DB can not cache. 方法2: keep claimed status}