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Updating known issues for PowerStore for Snapshot clones #1152

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Jun 25, 2024
Merged

Updating known issues for PowerStore for Snapshot clones #1152

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639a507
Updates the msg for clarity
delldubey Jun 21, 2024
e1f8b03
Merge branch 'main' into pstore_snapClone_knownIssue
boyamurthy Jun 25, 2024
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24 changes: 12 additions & 12 deletions content/docs/csidriver/release/powerstore.md
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Expand Up @@ -29,18 +29,18 @@ description: Release notes for PowerStore CSI driver

### Known Issues

| Issue | Resolution or workaround, if known |
|--------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Delete namespace that has PVCs and pods created with the driver. The External health monitor sidecar crashes as a result of this operation | Deleting the namespace deletes the PVCs first and then removes the pods in the namespace. This brings a condition where pods exist without their PVCs and causes the external-health-monitor sidecar to crash. This is a known issue and has been reported at https://github.com/kubernetes-csi/external-health-monitor/issues/100 <br> |
| fsGroupPolicy may not work as expected without root privileges for NFS only<br/>https://github.com/kubernetes/examples/issues/260 | To get the desired behavior set "allowRoot: "true" in the storage class parameter |
| If the NVMeFC pod is not getting created and the host looses the ssh connection, causing the driver pods to go to error state | remove the nvme_tcp module from the host incase of NVMeFC connection |
| When a node goes down, the block volumes attached to the node cannot be attached to another node | This is a known issue and has been reported at https://github.com/kubernetes-csi/external-attacher/issues/215. Workaround: <br /> 1. Force delete the pod running on the node that went down <br /> 2. Delete the volumeattachment to the node that went down. <br /> Now the volume can be attached to the new node. |
| When driver node pods enter CrashLoopBackOff and PVC remains in pending state with one of the following events:<br /> 1. failed to provision volume with StorageClass `<storage-class-name>`: error generating accessibility requirements: no available topology found <br /> 2. waiting for a volume to be created, either by external provisioner "csi-powerstore.dellemc.com" or manually created by system administrator. | Check whether all array details present in the secret file are valid and remove any invalid entries if present. <br/>Redeploy the driver. |
| If an ephemeral pod is not being created in OpenShift 4.13 and is failing with the error "error when creating pod: the pod uses an inline volume provided by CSIDriver csi-powerstore.dellemc.com, and the namespace has a pod security enforcement level that is lower than privileged." | This issue occurs because OpenShift 4.13 introduced the CSI Volume Admission plugin to restrict the use of a CSI driver capable of provisioning CSI ephemeral volumes during pod admission https://docs.openshift.com/container-platform/4.13/storage/container_storage_interface/ephemeral-storage-csi-inline.html . Therefore, an additional label "security.openshift.io/csi-ephemeral-volume-profile" needs to be added to the CSIDriver object to support inline ephemeral volumes. |
| In OpenShift 4.13, the root user is not allowed to perform write operations on NFS shares, when root squashing is enabled. | The workaround for this issue is to disable root squashing by setting allowRoot: "true" in the NFS storage class. |
| If the volume limit is exhausted and there are pending pods and PVCs due to `exceed max volume count`, the pending PVCs will be bound to PVs, and the pending pods will be scheduled to nodes when the driver pods are restarted. | It is advised not to have any pending pods or PVCs once the volume limit per node is exhausted on a CSI Driver. There is an open issue reported with Kubenetes at https://github.com/kubernetes/kubernetes/issues/95911 with the same behavior. |
| If two separate networks are configured for ISCSI and NVMeTCP, the driver may encounter difficulty identifying the second network (e.g., NVMeTCP). | This is a known issue, and the workaround involves creating a single network on the array to serve both ISCSI and NVMeTCP purposes. |
| Creation of clone PVC using snapshot will fail when the source PVC is deleted | This is a known issue, and the workaround is do not delete the source PVC if you want to create clone volumes using snapshot. |
| Issue | Resolution or workaround, if known |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Delete namespace that has PVCs and pods created with the driver. The External health monitor sidecar crashes as a result of this operation | Deleting the namespace deletes the PVCs first and then removes the pods in the namespace. This brings a condition where pods exist without their PVCs and causes the external-health-monitor sidecar to crash. This is a known issue and has been reported at https://github.com/kubernetes-csi/external-health-monitor/issues/100 <br> |
| fsGroupPolicy may not work as expected without root privileges for NFS only<br/>https://github.com/kubernetes/examples/issues/260 | To get the desired behavior set "allowRoot: "true" in the storage class parameter |
| If the NVMeFC pod is not getting created and the host looses the ssh connection, causing the driver pods to go to error state | remove the nvme_tcp module from the host incase of NVMeFC connection |
| When a node goes down, the block volumes attached to the node cannot be attached to another node | This is a known issue and has been reported at https://github.com/kubernetes-csi/external-attacher/issues/215. Workaround: <br /> 1. Force delete the pod running on the node that went down <br /> 2. Delete the volumeattachment to the node that went down. <br /> Now the volume can be attached to the new node. |
| When driver node pods enter CrashLoopBackOff and PVC remains in pending state with one of the following events:<br /> 1. failed to provision volume with StorageClass `<storage-class-name>`: error generating accessibility requirements: no available topology found <br /> 2. waiting for a volume to be created, either by external provisioner "csi-powerstore.dellemc.com" or manually created by system administrator. | Check whether all array details present in the secret file are valid and remove any invalid entries if present. <br/>Redeploy the driver. |
| If an ephemeral pod is not being created in OpenShift 4.13 and is failing with the error "error when creating pod: the pod uses an inline volume provided by CSIDriver csi-powerstore.dellemc.com, and the namespace has a pod security enforcement level that is lower than privileged." | This issue occurs because OpenShift 4.13 introduced the CSI Volume Admission plugin to restrict the use of a CSI driver capable of provisioning CSI ephemeral volumes during pod admission https://docs.openshift.com/container-platform/4.13/storage/container_storage_interface/ephemeral-storage-csi-inline.html . Therefore, an additional label "security.openshift.io/csi-ephemeral-volume-profile" needs to be added to the CSIDriver object to support inline ephemeral volumes. |
| In OpenShift 4.13, the root user is not allowed to perform write operations on NFS shares, when root squashing is enabled. | The workaround for this issue is to disable root squashing by setting allowRoot: "true" in the NFS storage class. |
| If the volume limit is exhausted and there are pending pods and PVCs due to `exceed max volume count`, the pending PVCs will be bound to PVs, and the pending pods will be scheduled to nodes when the driver pods are restarted. | It is advised not to have any pending pods or PVCs once the volume limit per node is exhausted on a CSI Driver. There is an open issue reported with Kubenetes at https://github.com/kubernetes/kubernetes/issues/95911 with the same behavior. |
| If two separate networks are configured for ISCSI and NVMeTCP, the driver may encounter difficulty identifying the second network (e.g., NVMeTCP). | This is a known issue, and the workaround involves creating a single network on the array to serve both ISCSI and NVMeTCP purposes. |
| When a PV/PVC is deleted in Kubernetes, it will trigger the deletion of the underlying volume and snapshot on the array as a default behaviour. This can result in a situation where the VolumeSnapshot and VolumeSnapshotContent will still show "readyToUse: true", but leaves them unusable because it is no longer backed by underlying storage snapshot. This will not allow the creation of a PVC from snapshot and this could also lead to a data loss situations. | This is a known issue, and the workaround is use of **retain** policy on the various PV, VolumeSnapshot and VolumeSnapshotContent that you wish to use for cloning. |

### Note:

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2 changes: 1 addition & 1 deletion content/v1/csidriver/release/powerstore.md
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Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,7 @@ description: Release notes for PowerStore CSI driver
| In OpenShift 4.13, the root user is not allowed to perform write operations on NFS shares, when root squashing is enabled. | The workaround for this issue is to disable root squashing by setting allowRoot: "true" in the NFS storage class. |
| If the volume limit is exhausted and there are pending pods and PVCs due to `exceed max volume count`, the pending PVCs will be bound to PVs, and the pending pods will be scheduled to nodes when the driver pods are restarted. | It is advised not to have any pending pods or PVCs once the volume limit per node is exhausted on a CSI Driver. There is an open issue reported with Kubenetes at https://github.com/kubernetes/kubernetes/issues/95911 with the same behavior. |
| If two separate networks are configured for ISCSI and NVMeTCP, the driver may encounter difficulty identifying the second network (e.g., NVMeTCP). | This is a known issue, and the workaround involves creating a single network on the array to serve both ISCSI and NVMeTCP purposes. |
| Creation of clone PVC using snapshot will fail when the source PVC is deleted | This is a known issue, and the workaround is do not delete the source PVC if you want to create clone volumes using snapshot. |
| When a PV/PVC is deleted in Kubernetes, it will trigger the deletion of the underlying volume and snapshot on the array as a default behaviour. This can result in a situation where the VolumeSnapshot and VolumeSnapshotContent will still show "readyToUse: true", but leaves them unusable because it is no longer backed by underlying storage snapshot. This will not allow the creation of a PVC from snapshot and this could also lead to a data loss situations. | This is a known issue, and the workaround is use of **retain** policy on the various PV, VolumeSnapshot and VolumeSnapshotContent that you wish to use for cloning. |

### Note:

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