Storage vmotion to NFS datastores or vmdk expansion on NFS fails with error "Insufficient disk space on <NFS_VOLUME_NAME>"

Products

• VMware vCenter Server

Issue/Introduction

Symptoms:

• Unable to migrate the virtual machine disks to NFS datastores.

  Below errors in vCenter vpxd logs :

  msg = "Insufficient disk space on datastore 'NFS_Datatsore_name'."

• Trying to expand the hard disk size beyond 4TB also fails with "Insufficient disk space on datastore" despite free space on the NFS volume.

Environment

vSphere 7.x, 8.x

Cause

Max file size limitation on the NFS array was set to 4 TB and Large File Support was not enabled.

To verify large file support configuration On Dell PowerScale OneFS run below cmd :

# isi_large_file -l
System version: v9.7.0.0
Large file support ready: Yes
Large file support enabled: Yes
Current maximum file size: 16TB
Achievable maximum file size: 16TB

Conversely, the following example shows that does not have large file support enabled:

# isi_large_file -l
System version: v9.7.0.0
Large file support ready: Yes
Large file support enabled: No
Current maximum file size: 4.0TB
Achievable maximum file size: 16TB

Reference: https://www.delltechnologies.com/asset/en-us/products/storage/industry-market/h18371-wp-powerscale-onefs-large-file-support.pdf

Note: This is an external article and needs to be validated from the NFS array vendor.

Resolution

Engage NFS array vendor to increase the Max file size