Minimum memory requirements aren't met (7 GB is suggested for OS disk encryption).Although limited LVM data disk support is available, an LVM OS disk isn't. The OS disk uses a Logical Volume Manager (LVM) scheme.SELinux can be reenabled after encryption is complete. Security Enhanced Linux (SELinux) hasn't been disabled before enabling encryption, so the unmount step fails.Serializing and isolating such steps might resolve the issue. This conflict can happen when an Azure Resource Manager template defines multiple extensions to execute simultaneously, or when a custom script extension or other action runs simultaneously to disk encryption.

Custom scripts that run in close time proximity to the encryption being enabled, or if any other changes are being made on the VM during the encryption process.If there are still active processes holding open file handles to the OS drive, the OS drive can't be unmounted, resulting in a failure to encrypt the OS drive. Azure Disk Encryption is unable to shut down these processes safely as required in preparation of the OS drive for disk encryption. Large applications such as SAP, MongoDB, Apache Cassandra, and Docker aren't supported when they're installed and running in the OS before encryption.Customized images no longer match a supported file system or partitioning scheme.Examples of deviations can include the following items: Deviations from the supported image can interfere with the extension’s ability to unmount the OS drive. This error can occur when OS disk encryption is attempted on a VM with an environment that has been changed from the supported stock gallery image. If it can't unmount the drive, an error message of 'failed to unmount after …' is likely to occur. Linux operating system (OS) disk encryption must unmount the OS drive before running it through the full disk encryption process. This article is to help with troubleshooting disk-encryption-related problems.īefore taking any of the steps below, first ensure that the VMs you are attempting to encrypt are among the supported VM sizes and operating systems, and that you have met all the prerequisites: This guide is for IT professionals, information security analysts, and cloud administrators whose organizations use Azure Disk Encryption. Applies to: ✔️ Linux VMs ✔️ Flexible scale sets

Os x error could not unmount disk