Up-To-Dateness Vector (2)

DC1

USN 4711

DSA GUID

DC4

DC2

DC1 GUID

USN 3388

USN 2052

DC2 GUID

u DC4’s up-to-dateness vector l Assuming that only DC1 and DC2 (and maybe DC4) performed originating write operations

DC3

USN 1217