When you create a VMFS5 datastore on a device that supports the atomic test and set (ATS) locking, the datastore uses the ATS-only locking mechanism. In certain circumstances, you might need to downgrade the ATS-only locking to ATS+SCSI.
The downgrade process is similar to the ATS-only upgrade. As with the upgrade, depending on your storage configuration, you can perform the downgrade in online or offline mode.
- Change the locking mechanism to ATS+SCSI by running the following command:
esxcli storage vmfs lockmode set -s|--scsi -l|--volume-label= VMFS label -u|--volume-uuid= VMFS UUID.
- For an online mode, close the datastore on all hosts that have access to the datastore, so that the hosts can recognize the change.