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• Datastores are showing "Not consumed" on hosts.
• VMs may fail to vMotion.
• VMs may become orphaned when powered off.
• Snapshot-based backups may fail.
• In vCenter/hosts, snapshot creation and consolidation may fail with: message = "Consolidation failed for disk node 'scsi0:1': 12 (Cannot allocate memory)."

Cause

This is a known issue in VMFS6. In certain workflows, the memory is allocated but not freed up resulting in VMFS heap exhaustion.

The memory allocated gets freed during VMFS resource allocation and hence, creating a eagerzeroedthick file on VMFS datastore is an effective workaround. See the workaround section below for more details.

• Install Ubuntu Server (in this scenario 24.04.2 LTS) Minimized
• Select Install OpenSSH server
• Update and install necessary packages (or needed in template)

apt update
apt install open-vm-tools aptitude vim htop util-linux-extra -y
apt upgrade -y

• Disable cloud-init. NOTICE: Removing cloud-init, remove also necessary packages responsible for networking (e.g. netplan.io)