Manipulating MPIO modules and increasing volume sizes are both great ways to manage volume iSCSI
connections. There are other best practices and recommendations that can also help control how
connections are made to PS Series volumes. CHAP authentication for access control lists authentication
the preferred method of volume access authentication from an ease of administration point of view.
Each PS volume ACL (access control list) has a maximum of 16 entries (this is not related to iSCSI
connections) that can be CHAP accounts, IQN strings or IP addresses. In keeping with designing a
scalable, flexible environment, CHAP allows rapid deployment and discovery of volumes with a single ACL
entry. For example, Cluster A could have a single CHAP entry to talk to all of its volumes and Cluster B has
a different single CHAP entry to talk to all of its volumes. Shared volumes such as templates or shared data
would have both Cluster A CHAP and Cluster B CHAP assigned to it dramatically decreasing the
administration of ACL lists.