Implement systemd slice setup support in glusterd. See example below.
The config should look more or less like the example configuration below.

# Create a glusterfs slice.
# WARNING: Works only on RHEL7.

[service]
action=create-slice
# A directory named /etc/systemd/system/%service%.service.d will be created
# where %service% is the service mentioned below. In our case here;
# /etc/systemd/system/glusterd.service.d will be created.
service=glusterd
service_filename=99-cpu.conf
service_section=Service
service_keys=CPUAccounting,Slice
service_values=yes,glusterfs.slice
slice_section=Slice
slice_keys=CPUQuota
slice_values=400%
