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Article Number: 000186132

CSI Driver for Unity: Persistent Volume Claim (PVC) shows in Pending state when creating a PVC smaller than 1.5 GB on Unity when using NFS protocol

Summary: Persistent Volume Claim (PVC) shows in Pending state when creating a PVC smaller than 1.5 GB on Unity when using (Network File System)NFS protocol.

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Article Content

Symptoms

The user is unable to create a PVC smaller than 1.5 GB on Unity when using the NFS protocol with the following messages:

Describe on the PVC shows:
# kubectl describe pvc pvol0 -n test
...
Warning  ProvisioningFailed    35m                csi-unity.dellemc.com_unity-controller-66c9b748d7-8hxll_456d3759-46b6-42f5-88e0-75ff8036db4a  failed to provision volume with StorageClass "unity-nfs": rpc error: code = Unknown desc =  runid=170 Create Filesystem csi-b46e130f5f failed with error: [{The specified file system size is too small. (Error Code:0x6701401)}]

The PVC shows Pending:
# kubectl get pvc -n test
NAME    STATUS    VOLUME   CAPACITY   ACCESS MODES   STORAGECLASS   AGE
pvol0   Pending                                      unity-nfs      37m

CSI Controller Driver logs show:
time="2021-05-04T18:05:04Z" level=debug arrayid=apm00180305385 runid=178 msg="Error in response. Method:POST URI:/api/types/storageResource/action/createFilesystem Error: [{The specified file system size is too small. (Error Code:0x6701401)}] JSON Error: [{The specified file system size is too small. (Error Code:0x6701401)}]" func="github.com/dell/gounity.(*Client).executeWithRetryAuthenticate()" file="dell/gounity/unityclient.go:113"
time="2021-05-04T18:05:04Z" level=error arrayid=apm00180305385 runid=178 msg="failed to invoke Unity REST API server" func="github.com/dell/gounity.(*Client).executeWithRetryAuthenticate()" file="dell/gounity/unityclient.go:127"
time="2021-05-04T18:05:04Z" level=debug arrayid=apm00180305385 runid=178 msg="Filesystem create response:<nil> Error:[{The specified file system size is too small. (Error Code:0x6701401)}]" func="github.com/dell/csi-unity/service.(*service).CreateVolume()" file="/go/src/csi-unity/service/controller.go:198"
time="2021-05-04T18:05:04Z" level=debug msg="/csi.v1.Controller/CreateVolume: REP 0178: rpc error: code = Unknown desc =  runid=178 Create Filesystem csi-b46e130f5f failed with error: [{The specified file system size is too small. (Error Code:0x6701401)}]"

Cause

As noted in the documentation, this is an array limitation:
Note: Additional 1.5 GB is added to the required size of NFS based volume/pvc. This is due to unity array requirement, which consumes this 1.5 GB for storing metadata. This makes minimum PVC size for NFS protocol via driver as 1.5 GB, which is 3 GB when created directly on the array.

Resolution

The PVC should be created with a minimum size of 1.5 GB.

Article Properties

Affected Product

CSI Driver for Unity

Product

Dell EMC Unity

Last Published Date

08 Apr 2022

Version

3

Article Type

Solution

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