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Based on RFE - https://bugzilla.redhat.com/show_bug.cgi?id=1575529

In CNS 3.10 documentation with gluster-block related section, we would need to add the new multipath configuration details so as to support the load-balancing feature introduced as per RFE-1575529

In gluster-block versions prior to gluster-block-0.2.1-19.el7rhgs, there was no load-balancing feature enabled and hence we were using "prio:const" in /etc/multipath.conf file of initiators.

As part of specifying priorities, we will now have two target portal groups per storage object i.e. glfs_tg_pt_gp_ao and glfs_tg_pt_gp_ano, active optimized (AO) and active non optimized(ANO). AO will have prio 50 and ANO will have priority 10.

And to use this benefit, on the initiator side we will have to set 'prio alua'

# cat /etc/multipath.conf
[...]
# LIO iSCSI
devices {
        device {
                vendor "LIO-ORG"
                user_friendly_names "yes" # names like mpatha
                path_grouping_policy "failover" # one path per group
                path_selector "round-robin 0"
                failback immediate
                path_checker "tur"
                prio "alua"
                no_path_retry 120
                rr_weight "uniform"
        }
}




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