Secondary SCSI disk assigned to VM becomes inaccessible after a backup
Article ID: VMW0012 Enabling Change Block Tracking (CBT) caused disk to go into a read-only status.
Disabling and then re-enabling changed block tracking (CBT) on Virtual Machine causes SCSI disk to disappear or report that the File System needs to be repaired. After detaching and re-attaching the disks back to the Virtual Machine the disks are accessible again.
Known issue with early version of VMware vRealize Automation - formerly known as vCloud Automation Center (vCAC). See VMware Knowledge Base article:
As per VMware Knowledge Base article the issue is fixed in vCAC version 5.1 U 2. Upgrade to latest version of VMware vRealize Automation..