Administration

Table Of Contents
Display information about the machine machine3 and format the output as comma-separated values.
vdmadmin -M -m machine3 -csv
Reclaiming Disk Space on Virtual Machines Using the M
Option
You can use the vdmadmin command with the -M option to mark a linked-clone virtual machine for disk
space reclamation. Horizon 7 directs the ESXi host to reclaim disk space on the linked-clone OS disk
without waiting for the unused space on the OS disk to reach the minimum threshold that is specified in
Horizon Administrator.
Syntax
vdmadmin -M [-b authentication_arguments] -d desktop -m machine -markForSpaceReclamation
Usage Notes
With this option, you can initiate disk space reclamation on a particular virtual machine for demonstration
or troubleshooting purposes.
Space reclamation does not take place if you run this command when a blackout period is in effect.
The following prerequisites must be met before you can reclaim disk space by using the vdmadmin
command with the -M option:
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Verify that Horizon 7 is using vCenter Server and ESXi version 5.1 or later.
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Verify that VMware Tools that are provided with vSphere version 5.1 or later are installed on the
virtual machine.
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Verify that the virtual machine is virtual hardware version 9 or later.
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In Horizon Administrator, verify that the Enable space reclamation option is selected for vCenter
Server. See Allow vSphere to Reclaim Disk Space in Linked-Clone Virtual Machines.
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In Horizon Administrator, verify that the Reclaim VM disk space option was selected for the desktop
pool. See "Reclaim Disk Space on View Composer Linked Clones" in the Setting Up Virtual Desktops
in Horizon 7 document.
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Verify that the virtual machine is powered on before you initiate the space reclamation operation.
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Verify that a blackout period is not in effect. See "Set Storage Accelerator and Space Reclamation
Blackout Times for View Composer Linked Clones" in the Setting Up Virtual Desktops in Horizon 7
document.
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