Hello,
in webadmin GUI I see on my 4.0.5 hosts a message related to updates available

If I run yum update in my plain CentOS 7.2 hosts I get:

1) vdsm packages
 vdsm                    x86_64 4.18.15.3-1.el7.centos ovirt-4.0                  688 k
 vdsm-api                noarch 4.18.15.3-1.el7.centos ovirt-4.0                   53 k
 vdsm-cli                noarch 4.18.15.3-1.el7.centos ovirt-4.0                   67 k
 vdsm-gluster            noarch 4.18.15.3-1.el7.centos ovirt-4.0                   53 k
 vdsm-hook-vmfex-dev     noarch 4.18.15.3-1.el7.centos ovirt-4.0                  6.6 k
 vdsm-infra              noarch 4.18.15.3-1.el7.centos ovirt-4.0                   12 k
 vdsm-jsonrpc            noarch 4.18.15.3-1.el7.centos ovirt-4.0                   25 k
 vdsm-python             noarch 4.18.15.3-1.el7.centos ovirt-4.0                  602 k
 vdsm-xmlrpc             noarch 4.18.15.3-1.el7.centos ovirt-4.0                   25 k
 vdsm-yajsonrpc          noarch 4.18.15.3-1.el7.centos ovirt-4.0                   27 k

Are they for anything particular?

2) gluster packages

 glusterfs               x86_64 3.7.17-1.el7           ovirt-4.0-centos-gluster37 483 k
 glusterfs-api           x86_64 3.7.17-1.el7           ovirt-4.0-centos-gluster37  87 k
 glusterfs-cli           x86_64 3.7.17-1.el7           ovirt-4.0-centos-gluster37 180 k
 glusterfs-client-xlators
                         x86_64 3.7.17-1.el7           ovirt-4.0-centos-gluster37 857 k
 glusterfs-fuse          x86_64 3.7.17-1.el7           ovirt-4.0-centos-gluster37 130 k
 glusterfs-geo-replication
                         x86_64 3.7.17-1.el7           ovirt-4.0-centos-gluster37 206 k
 glusterfs-libs          x86_64 3.7.17-1.el7           ovirt-4.0-centos-gluster37 355 k
 glusterfs-server        x86_64 3.7.17-1.el7           ovirt-4.0-centos-gluster37 1.4 M

Currently I have 3.7.16-1.el7.x86_64
How can I manage gluster updates on gluster environment with 3 hosts?
Separated by vdsm updates or in the same run?
Any hint/caveat?

Thanks
Gianluca