A VMware datastore can fill because of growing virtual disks, snapshots, backup jobs, ISO images or temporary files. Identify the owner and dependency of each large file before removal.
Investigation steps
- Check datastore used/free capacity and when consumption increased in vSphere.
- Identify the largest VM directories and inspect virtual disks, snapshot chains and backup activity.
- Review vSphere snapshot management for old or growing snapshots; do not delete delta files directly.
- Check ISO, templates, log files and ongoing replication/backup operations.
- Estimate the free space required for consolidation or Storage vMotion before performing changes.
Key precautions
- Never delete a VMDK, delta file or VM configuration file directly from the datastore browser without verifying its dependencies.
- Do not initiate snapshot consolidation on an almost full datastore until sufficient capacity and a recovery plan are confirmed.
- Document the responsible VM, affected backup chain and expected storage growth.