NFS Datastore Failed SVMFDSIoctlMoveData: No space left on device
Article ID: 378036
Updated On:
Products
Issue/Introduction
1. Datastore showing free space available in vCenter client.
2. VMs are throwing errors "There is no more space for virtual disk".
3. Cannot migrate VMs to another datastore.
VMkernel.log:
2024-09-20T18:25:34.065Z cpu50:2204508)WARNING: SVM: 2869: scsi0:0 Failed SVMFDSIoctlMoveData: No space left on device
2024-09-20T18:25:34.463Z cpu15:2206080)VmfsSparse: 6482: fd 16468308: Setting freeSector as 98819312. bad REs 0 bad LEs 0 maxSector 98819312 endOfRETable 444 nonEmptyREs 25379 emptyLEs 0 numREs 56320 prevAllocSectors 98730432 allocSectors 98828736
2024-09-20T18:25:34.464Z cpu15:2206080)Cow: 1991: Sync IO issued on cow disk 'testmachine.vmdk' failed with No space left on device
2024-09-20T18:25:34.464Z cpu15:2206080)VmfsSparse: 2062: Sparse COW open (fd 16468308, isSparse: 0, sparseInfo 0x43125fe01ba0) finished with status: No space left on device
2024-09-20T18:25:34.464Z cpu15:2206080)Cow: 612: Failed to open file testmachine.vmdk, level 1 of 2 (extent 'vmfssparse' fhID16468308) with No space left on device
2024-09-20T18:25:34.464Z cpu15:2206080)WARNING: DD: 630: Opening the cow hierarchy for testmachine.vmdk failed with No space left on device
Environment
VMware ESXi 6.0
VMware ESXi 7.0
VMware ESXi 8.0
Cause
The error message "Failed SVMFDSIoctlMoveData: No space left on device" indicates that a Storage Virtualization Manager (SVM) failed to move data due to insufficient storage space on the device. This error often occurs when a virtual machine (VM) needs to write to disk and there's not enough space available on the underlying storage.
Resolution
1. Regularly monitor the storage usage of your datastores and VMs to identify potential space issues early.
2. As a best practice delete old snapshots to reclaim space.
3. Check the NFS server's logs for any error messages or indications of problems.
4. Problems with the NFS server, such as hardware failures or software glitches, can affect data availability and storage space.
Additional Information
The Network File System (NFS) server is the machine that shares files and directories over a network. It's where the actual data for the COW disk is stored.
COW Disk (Copy-on-Write Disk): A copy-on-write disk is a type of virtual disk where changes are written to a separate delta file. This helps improve performance and reduces the amount of data that needs to be transferred over the network.
NFS storage: Using NFS storage for COW disks can provide benefits such as centralized management, scalability, and high availability.
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