Extending a RDM with snapshots can result in corrupted data

Products

• VMware vSphere ESXi

Issue/Introduction

Symptoms:

• Data is corrupt on RDMs
• You have recently increased the size of your RDM

Environment

VMware ESXi 3.5.x Installable
VMware ESXi 3.5.x Embedded
VMware ESX Server 3.5.x
VMware ESX Server 3.0.x

Resolution

Always commit snapshots prior to making an configuration changes to a virtual machine, including increasing the size of an RDM.

Failure to have snapshots committed before performing these changes can result in data corruption.