For Service Pack 16 and more recent service packs, the default number of data readers for new Virtual Server Agent subclients is 5 for all hypervisors.
For Service Pack 15 and earlier service packs, the default number of data readers was 2 for all hypervisors. For subclients that were created in Service Pack 15 or earlier service packs, the previous default value is retained when you upgrade to a later service pack.