By disabling certain Windows 7, Windows 8/8.1, and Windows 10 services and tasks, you can reduce the growth in disk usage of instant clones and linked clones. Disabling certain services and tasks can also result in performance benefits for full virtual machines.
Benefits of Disabling Windows Services and Tasks Windows 7, Windows 8/8.1, and Windows 10 schedule services and tasks that can cause instant clones and linked clones to grow, even when the machines are idle. The incremental growth of the OS disk can undo the storage savings that you achieve when you first create the clones. You can reduce growth in disk size by disabling these Windows services.
Windows Services and Tasks That Cause Disk Growth in Instant Clones and Linked Clones Certain services and tasks in Windows 7, Windows 8/8.1, and Windows 10 can cause the OS disk of an instant clone or linked clone to grow incrementally, even when the machine is idle. If you disable these services and tasks, you can control the OS disk growth.
Disable Scheduled Disk Defragmentation on a Windows Parent Virtual Machine When you prepare a parent image virtual machine for instant clones or linked clones, it is recommended that you disable scheduled defragmentation. Windows schedule weekly disk defragmentations by default. Defragmentation significantly increase the size of a clone's virtual disk and does not make disk access more efficient for instant clones or linked clones.
Disable Windows Update Disabling the Windows Update feature avoids some I/O operations to the file system and can reduce the growth of an instant clone's or a linked clone's virtual disk.
Disable the Diagnostic Policy Service on Windows Virtual Machines Disabling the Windows Diagnostic Policy Service avoids some I/O operations to the file system and can reduce the growth of an instant clone's or a linked clone's virtual disk.
Disable Windows Registry Backup on Windows Virtual Machines Disabling the Windows registry backup feature, RegIdleBackup , avoids some I/O operations to the file system and can reduce the growth of an instant clone's or a linked clone's virtual disk.
Disable the System Restore on Windows Virtual Machines Disabling the Windows System Restore feature avoids some I/O operations to the file system and can reduce the growth of an instant clone's or a linked clone's virtual disk.
Disable Windows Defender on Windows Virtual Machines Disabling Windows Defender avoids some I/O operations to the file system and can reduce the growth of an instant clone's or a linked clone's virtual disk.
Disable Microsoft Feeds Synchronization on Windows Virtual Machines Windows Internet Explorer uses the Microsoft Feeds Synchronization task to update RSS feeds in users' Web browsers. Disabling this task avoids some I/O operations to the file system and can reduce the growth of an instant clone's or a linked clone's virtual disk.