This example deals with creating a persistant volume and sharing the volume with one or more PODs
Some points to keep in mind

1. persistant volume (pv) in openshift is using nfs storage in this example
2. volumeName attribute in  PVC ensures that, pvc always binds to a specific  PV

Setup nfs server (Skip if you have already)

yum install -y nfs-utils

mkdir /nfsshare && mkdir /nfsshare/pv01 && mkdir /nfsshare/pv02 && mkdir /nfsshare/pv03
systemctl enable rpcbind
systemctl enable nfs-server
systemctl enable nfs-lock
systemctl enable nfs-idmap
systemctl start rpcbind
systemctl start nfs-server
chown -R nfsnobody:nfsnobody /nfsshare

for k in {4..50}; do mkdir -p /nfsshare/pv$k; done
for k in {4..50}; do echo  '/nfsshare/pv'${k}' *(rw,root_squash,no_wdelay,sync)'; done
setsebool -P virt_sandbox_use_nfs 1 #on all nodes
setsebool -P virt_use_nfs 1  #on all nodes
systemctl restart nfs-server
showmount -e

Creating persistant volumes & persistant volume claims

oc create -f pv.yml  #update server attribute based on your nfs server
oc create -f pvc.yml

Use PVC inside pods

Im using same pvc "claim1" in both pods

oc create -f pv-pod1.yml
oc create -f pv-pod2.yml

If i ssh into one pod and change contents of /var/www/html, it should effect other pod /var/www/html

Ignore notes below

for k in {4..50}; do mkdir -p /nfsshare/pv$k; done
for k in {4..50}; do echo  '/nfsshare/pv'${k}' *(rw,root_squash)'; done
systemctl restart nfs-server

for k in {4..50}
do
cat <<EOF>> pv.yaml
apiVersion: "v1"
kind: "PersistentVolume"
metadata:
 name: "pv$k"
spec:
 capacity:
   storage: "1Gi"
 accessModes:
   - "ReadWriteMany"
   - "ReadWriteOnce"
 nfs:
   path: "/nfsshare/pv$k"
   server: "35.161.240.37"
 persistentVolumeReclaimPolicy: "Recycle"
EOF
oc create -f pv.yaml
done

firewall-cmd --permanent --add-service=nfs
firewall-cmd --permanent --add-service=mountd
firewall-cmd --permanent --add-service=rpc-bind
firewall-cmd --reload