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Manipulating VMWare Images

VMWare includes the tool vmware-vdiskmanager (.exe) to manipulate VMWare disk images.

$ vmware-vdiskmanager /?
Exactly one major option should be specified.
VMware Virtual Disk Manager - build 44356.
Usage: vmware-vdiskmanager OPTIONS diskName 
Offline disk manipulation utility
     -c                   : create disk; need to specify other create options
     -d                   : defragment the specified virtual disk
     -n <source-disk>     : rename the specified virtual disk; need to
                            specify destination disk-name
     -q                   : do not log messages
     -r <source-disk>     : convert the specified disk; need to specify
                            destination disk-type
     -x <new-capacity>    : expand the disk to the specified capacity

     Additional options for create and convert:
        -a <adapter>      : (for use with -c only) adapter type (ide, buslogic or lsilogic)
        -s <size>         : capacity of the virtual disk
        -t <disk-type>    : disk type id

     Disk types:
        0                 : single growable virtual disk
        1                 : growable virtual disk split in 2Gb files
        2                 : preallocated virtual disk
        3                 : preallocated virtual disk split in 2Gb files

     The capacity can be specified in sectors, Kb, Mb or Gb.
     The acceptable ranges:
                           ide adapter : [100.0Mb, 950.0Gb]
                           scsi adapter: [100.0Mb, 950.0Gb]
        ex 1: vmware-vdiskmanager -c -s 850Mb -a ide -t 0 myIdeDisk.vmdk
        ex 2: vmware-vdiskmanager -d myDisk.vmdk
        ex 3: vmware-vdiskmanager -r sourceDisk.vmdk -t 0 destinationDisk.vmdk
        ex 4: vmware-vdiskmanager -x 36Gb myDisk.vmdk
        ex 5: vmware-vdiskmanager -n sourceName.vmdk destinationName.vmdk

Merging Vmware snapshots
By default, VMare calls the snapshot files as machinename-000000N.vmdk and you find it in your virtual machine directory. You can merge snapshot of a virtual machine with the following command:

        vmware-vdiskmanager -r testhost-000001.vmdk -t 0 merged-testhost.vmdk

Just give the snapshot (testhost-000001.vmdk) you want to merge with original state, the disk type (0 means single growable virtual disk) and the name of the new vmdk file (merged-testhost.vmdk). After merging, this file will contain the original state merged with given snapshot.