The script polls the list of persistent volumes and if finds an unused one then recreates it with the same size but different name on nfs.

00_pv_recycle.sh

#!/usr/bin/bash

export PATH=/usr/local/bin:/usr/bin

[[ -f /var/run/pv.lock ]] && exit 0
touch /var/run/pv.lock

createPv ()
{
    local pvRoot="$1";
    local size="$2";
    local number=$(cat /etc/pvseq || echo 0);
    let number++;
    local pvName=pv$(printf "%06d" $number);
    local pvDir=$pvRoot/$pvName;
    mkdir -p $pvDir;
    chown nfsnobody:nfsnobody $pvDir;
    chmod 775 $pvDir;
    echo "$pvDir *(rw,root_squash,no_wdelay)" >> /etc/exports;
    /usr/sbin/exportfs -ra
    
    oc create -f -  > /dev/null <<EOF
apiVersion: v1
kind: PersistentVolume
metadata:
    name: $pvName
spec:
    capacity:
        storage: $size
    accessModes:
    - ReadOnlyMany
    - ReadWriteOnce
    - ReadWriteMany
    nfs:
        path: $pvDir
        server: localhost
EOF

    echo $number > /etc/pvseq
}
deletePv ()
{
    local pvRoot="$1";
    local pvName="$2";
    local pvDir=$pvRoot/$pvName;
    oc delete pv $pvName > /dev/null;
    rm -rf $pvDir;
    sed -i "/^${pvDir////\\/} /d" /etc/exports
}

oc get pv | grep '^pv' | grep -e Failed -e Released | awk '{print $1 " " $2;}' | while read pvName pvSize; do
    deletePv /mnt/pvs $pvName
    createPv /mnt/pvs $pvSize
done

rm /var/run/pv.lock

01_init_pvs.sh

pvRoot=/mnt/pvs

for size in \
    $(yes 100Mi | head -10) \
    $(yes 500Mi | head -6) \
    $(yes 1Gi | head -20) \
    $(yes 5Gi | head -11) \
    $(yes 10Gi | head -2)
do
    # createPv from pv_recycle.sh
    createPv $pvRoot $size
done

02_crontab

*/1 * * * *    /usr/bin/pv_recycle.sh