Error "An error occurred while consolidating disks: 110 (Connection timed out)" when trying to consolidate after deleting a snapshot.

Products

• VMware vCenter Server

Issue/Introduction

Snapshot consolidation fails with error: An error occurred while consolidating disks: 110 (Connection timed out) in vCenter for the consolidation Task. 

On the host that has the VM running on it, in the vmkernel.log, you see messages similar to:

2025-09-23T18:04:33.102Z In(182) vmkernel: cpu2:1439657)ScsiDeviceIO: 6478: Command 0x8a (CmdSN 0x13d7a71, World <world ID>) to device naa.<device ID of VM datastore> timed out: expiry time occurs 576065ms in the past

and

2025-09-23T09:29:29.422Z Wa(180) vmkwarning: cpu2:1049112)WARNING: ScsiDeviceIO: 1780: Device naa.<device ID of VM datastore> performance has deteriorated. I/O latency increased from average value of 4529 microseconds to 90638 microseconds.

1. Log in to vCenter and go to the datastore browser
2. Select the datastore the virtual machine is on and select Summary.
3. Note the capacity of the datastore by looking at the Capacity size under Capacity and Usage. 
   
   Note: To find naa.<device ID of VM datastore> of the datastore the VM is on, select the datastore in the datastore browser in vCenter, select Configure and then Device Backing.

Environment

vSphere 8.x

Cause

If the datastore is larger than 64TB, this is an unsupported configuration and can cause timeouts and latency when accessing the datastore during high I/O operations like snapshot consolidation. 

Refer to the latest VMware Configuration Maximums for datastore maximums. 

Resolution

VMFS datastores cannot be reduced in size. All data must be migrated to a different datastore and the oversized datastore will need to be removed and recreated. 

Refer to Reduce the size of a VMFS datastore.