Description of problem:

Testing how long it takes to re-attach PVC ( with data ) to pods which are starting on different nodes in cluster. 
Test consist of following

1. Create Pod/PVC
2. Write some data ( in this test focus is on number of inodes ), but this is not deciding, so just create some data -
3. Delete pod
4. Create new pod and re-attach PVC to it
5. Repeat steps 3. and 4. multiple times and let pods to start on different nodes in cluster. 

 if you want exact environment follow steps 
-----------------------------------------------------------------
$ git clone https://github.com/ShyamsundarR/ocs-monkey.git
$ cd ./ocs-monkey
$ git checkout attach-rate
$ source setup-env.sh
//edit conftest.py and old/test_attach_with_data.py - change SC name and number of files 
$ pytest -v -m attachwithdata
// collect the data
$ deactivate
------------------------------------------------------------------


Version-Release number of selected component (if applicable):
oc get clusterversion
NAME      VERSION                        AVAILABLE   PROGRESSING   SINCE   STATUS
version   4.2.0-0.ci-2019-10-07-210343   True   

How reproducible:
always 
Issue is not related to specific storage class  / or file system. I tested gp2/ceph-rbd and xfs/ext4


Actual results:
PVC re-attach is slow 

Expected results:
PVC re-attach to be faster 

StorageClass Dump (if StorageClass used by PV/PVC):

# oc describe pvc
Name:          mypvc
Namespace:     ns-443844244
StorageClass:  gp2
Status:        Bound
Volume:        pvc-972f0eea-ef4a-11e9-a2cf-0a6f6786a89c
Labels:        <none>
Annotations:   pv.kubernetes.io/bind-completed: yes
               pv.kubernetes.io/bound-by-controller: yes
               volume.beta.kubernetes.io/storage-provisioner: kubernetes.io/aws-ebs
               volume.kubernetes.io/selected-node: ip-10-0-168-71.us-west-2.compute.internal
Finalizers:    [kubernetes.io/pvc-protection]
Capacity:      100Gi
Access Modes:  RWO
VolumeMode:    Filesystem
Events:
  Type       Reason                 Age    From                                                                 Message
  ----       ------                 ----   ----                                                                 -------
  Normal     WaitForFirstConsumer   6m52s  persistentvolume-controller                                          waiting for first consumer to be created before binding
  Normal     Provisioning           6m51s  ebs.csi.aws.com_ip-10-0-138-54_02930534-ef48-11e9-a784-0674b8c8776c  External provisioner is provisioning volume for claim "ns-443844244/mypvc"
  Normal     ProvisioningSucceeded  6m51s  persistentvolume-controller                                          Successfully provisioned volume pvc-972f0eea-ef4a-11e9-a2cf-0a6f6786a89c using kubernetes.io/aws-ebs
Mounted By:  mypod-deployment-78b5ccff5-pfsjp


---- 
# oc describe pod
Name:               mypod-deployment-78b5ccff5-pfsjp
Namespace:          ns-443844244
Priority:           0
PriorityClassName:  <none>
Node:               ip-10-0-168-71.us-west-2.compute.internal/10.0.168.71
Start Time:         Tue, 15 Oct 2019 12:58:47 +0000
Labels:             app=mypod
                    pod-template-hash=78b5ccff5
Annotations:        openshift.io/scc: restricted
Status:             Pending
IP:                 
Controlled By:      ReplicaSet/mypod-deployment-78b5ccff5
Containers:
  busybox:
    Container ID:  
    Image:         busybox
    Image ID:      
    Port:          <none>
    Host Port:     <none>
    Command:
      sleep
      99999
    State:          Waiting
      Reason:       ContainerCreating
    Ready:          False
    Restart Count:  0
    Environment:    <none>
    Mounts:
      /mnt from mypvc (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-x4bd7 (ro)
Conditions:
  Type              Status
  Initialized       True 
  Ready             False 
  ContainersReady   False 
  PodScheduled      True 
Volumes:
  mypvc:
    Type:       PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
    ClaimName:  mypvc
    ReadOnly:   false
  default-token-x4bd7:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-x4bd7
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:
  Type     Reason                  Age   From                     Message
  ----     ------                  ----  ----                     -------
  Normal   Scheduled               25s   default-scheduler        Successfully assigned ns-443844244/mypod-deployment-78b5ccff5-pfsjp to ip-10-0-168-71.us-west-2.compute.internal
  Warning  FailedAttachVolume      25s   attachdetach-controller  Multi-Attach error for volume "pvc-972f0eea-ef4a-11e9-a2cf-0a6f6786a89c" Volume is already exclusively attached to one node and can't be attached to another
  Normal   SuccessfulAttachVolume  6s    attachdetach-controller  AttachVolume.Attach succeeded for volume "pvc-972f0eea-ef4a-11e9-a2cf-0a6f6786a89c"


--- 
# oc get sc gp2  -o yaml 
allowVolumeExpansion: true
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  annotations:
    storageclass.kubernetes.io/is-default-class: "true"
  creationTimestamp: "2019-10-09T09:35:33Z"
  name: gp2
  ownerReferences:
  - apiVersion: v1
    kind: clusteroperator
    name: storage
    uid: 2c90c6ee-ea77-11e9-b6cb-0611eeebf350
  resourceVersion: "8385"
  selfLink: /apis/storage.k8s.io/v1/storageclasses/gp2
  uid: 2432529b-ea78-11e9-a365-02227df4d606
parameters:
  encrypted: "true"
  type: gp2
provisioner: kubernetes.io/aws-ebs
reclaimPolicy: Delete
volumeBindingMode: WaitForFirstConsumer
root@ip-172-31-59-125: ~/srangana/ocs-monkey # oc get sc rook-ceph-block -o yaml 
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  creationTimestamp: "2019-10-11T16:45:48Z"
  name: rook-ceph-block
  resourceVersion: "1384630"
  selfLink: /apis/storage.k8s.io/v1/storageclasses/rook-ceph-block
  uid: 93f2b71b-ec46-11e9-b5c2-06d88a0a32a6
parameters:
  clusterID: rook-ceph
  csi.storage.k8s.io/fstype: xfs
  csi.storage.k8s.io/node-stage-secret-name: rook-ceph-csi
  csi.storage.k8s.io/node-stage-secret-namespace: rook-ceph
  csi.storage.k8s.io/provisioner-secret-name: rook-ceph-csi
  csi.storage.k8s.io/provisioner-secret-namespace: rook-ceph
  imageFeatures: layering
  imageFormat: "2"
  pool: replicapool
provisioner: rook-ceph.rbd.csi.ceph.com
reclaimPolicy: Delete
volumeBindingMode: Immediate