Today I had a problem, I ran out of time and I had to create a clone of virtual machine but I didn't wanted to install again the SO, what I did is create a duplicate in file system of the vm. When I tried to start both machines at same time I get an error of UUID.
To fix this:
I changed the UUID with a vbox command
C:\Program Files\Oracle\VirtualBox>VBoxManage.exe internalcommands sethduuid "C:
\Users\Alejandro\VirtualBox VMs\OL6.6_BI1\OL6.6.vdi"
UUID changed to: 762eadf7-3b7a-4d9b-a08f-6a88e888931b
Then I got an Error with the VM when I was trying to started it, Checking the files associated I realized that the old UUID was in, So I use the new UUID and replace the UUID reference in the file associated to the VDI the vbox file.
Content:
<?xml version="1.0"?>
<!--
** DO NOT EDIT THIS FILE.
** If you make changes to this file while any VirtualBox related application
** is running, your changes will be overwritten later, without taking effect.
** Use VBoxManage or the VirtualBox Manager GUI to make changes.
-->
<VirtualBox xmlns="http://www.innotek.de/VirtualBox-settings" version="1.14-windows">
<Machine uuid="{762eadf7-3b7a-4d9b-a08f-6a88e888931b}" name="OL6.6" OSType="Oracle_64" snapshotFolder="Snapshots" lastStateChange="2015-07-01T02:37:11Z">
<MediaRegistry>
<HardDisks>
<HardDisk uuid="{762eadf7-3b7a-4d9b-a08f-6a88e888931b}" location="OL6.6.vdi" format="VDI" type="Normal"/>
</HardDisks>
<DVDImages/>
<FloppyImages/>
</MediaRegistry>
<ExtraData>
<ExtraDataItem name="GUI/LastCloseAction" value="PowerOff"/>
<ExtraDataItem name="GUI/LastGuestSizeHint" value="640,480"/>
<ExtraDataItem name="GUI/LastNormalWindowPosition" value="806,72,944,394,max"/>
<ExtraDataItem name="GUI/MiniToolBarAlignment" value="bottom"/>
<ExtraDataItem name="GUI/SaveMountedAtRuntime" value="yes"/>
<ExtraDataItem name="GUI/ShowMiniToolBar" value="yes"/>
</ExtraData>
<Hardware version="2">
<CPU count="1" hotplug="false">
<HardwareVirtEx enabled="true"/>
<HardwareVirtExNestedPaging enabled="true"/>
<HardwareVirtExVPID enabled="true"/>
<HardwareVirtExUX enabled="true"/>
<PAE enabled="true"/>
<LongMode enabled="true"/>
<HardwareVirtExLargePages enabled="true"/>
<HardwareVirtForce enabled="false"/>
</CPU>
<Memory RAMSize="4096" PageFusion="false"/>
<HID Pointing="PS2Mouse" Keyboard="PS2Keyboard"/>
<HPET enabled="false"/>
<Chipset type="PIIX3"/>
<Boot>
<Order position="1" device="Floppy"/>
<Order position="2" device="DVD"/>
<Order position="3" device="HardDisk"/>
<Order position="4" device="None"/>
</Boot>
<Display VRAMSize="12" monitorCount="1" accelerate3D="false" accelerate2DVideo="false"/>
<VideoCapture enabled="false" screens="18446744073709551615" horzRes="1024" vertRes="768" rate="512" fps="25"/>
<RemoteDisplay enabled="false" authType="Null" authTimeout="5000"/>
<BIOS>
<ACPI enabled="true"/>
<IOAPIC enabled="true"/>
<Logo fadeIn="true" fadeOut="true" displayTime="0"/>
<BootMenu mode="MessageAndMenu"/>
<TimeOffset value="0"/>
<PXEDebug enabled="false"/>
</BIOS>
<USB>
<Controllers>
<Controller name="OHCI" type="OHCI"/>
<Controller name="EHCI" type="EHCI"/>
</Controllers>
<DeviceFilters/>
</USB>
<Network>
<Adapter slot="0" enabled="true" MACAddress="08002723B9FA" cable="true" speed="0" promiscuousModePolicy="AllowAll" type="82540EM">
<DisabledModes>
<NAT>
<DNS pass-domain="true" use-proxy="false" use-host-resolver="false"/>
<Alias logging="false" proxy-only="false" use-same-ports="false"/>
</NAT>
<InternalNetwork name="intnet"/>
<NATNetwork name="NatNetwork"/>
</DisabledModes>
<BridgedInterface name="Intel(R) Dual Band Wireless-AC 7260"/>
</Adapter>
<Adapter slot="1" enabled="false" MACAddress="0800274AF066" cable="true" speed="0" type="82540EM">
<DisabledModes>
<NAT>
<DNS pass-domain="true" use-proxy="false" use-host-resolver="false"/>
<Alias logging="false" proxy-only="false" use-same-ports="false"/>
</NAT>
</DisabledModes>
</Adapter>
<Adapter slot="2" enabled="false" MACAddress="0800278B7008" cable="true" speed="0" type="82540EM">
<DisabledModes>
<NAT>
<DNS pass-domain="true" use-proxy="false" use-host-resolver="false"/>
<Alias logging="false" proxy-only="false" use-same-ports="false"/>
</NAT>
</DisabledModes>
</Adapter>
<Adapter slot="3" enabled="false" MACAddress="08002755B6EB" cable="true" speed="0" type="82540EM">
<DisabledModes>
<NAT>
<DNS pass-domain="true" use-proxy="false" use-host-resolver="false"/>
<Alias logging="false" proxy-only="false" use-same-ports="false"/>
</NAT>
</DisabledModes>
</Adapter>
<Adapter slot="4" enabled="false" MACAddress="0800277F3F9A" cable="true" speed="0" type="82540EM">
<DisabledModes>
<NAT>
<DNS pass-domain="true" use-proxy="false" use-host-resolver="false"/>
<Alias logging="false" proxy-only="false" use-same-ports="false"/>
</NAT>
</DisabledModes>
</Adapter>
<Adapter slot="5" enabled="false" MACAddress="080027677373" cable="true" speed="0" type="82540EM">
<DisabledModes>
<NAT>
<DNS pass-domain="true" use-proxy="false" use-host-resolver="false"/>
<Alias logging="false" proxy-only="false" use-same-ports="false"/>
</NAT>
</DisabledModes>
</Adapter>
<Adapter slot="6" enabled="false" MACAddress="080027B9B276" cable="true" speed="0" type="82540EM">
<DisabledModes>
<NAT>
<DNS pass-domain="true" use-proxy="false" use-host-resolver="false"/>
<Alias logging="false" proxy-only="false" use-same-ports="false"/>
</NAT>
</DisabledModes>
</Adapter>
<Adapter slot="7" enabled="false" MACAddress="080027F0677A" cable="true" speed="0" type="82540EM">
<DisabledModes>
<NAT>
<DNS pass-domain="true" use-proxy="false" use-host-resolver="false"/>
<Alias logging="false" proxy-only="false" use-same-ports="false"/>
</NAT>
</DisabledModes>
</Adapter>
</Network>
<UART>
<Port slot="0" enabled="false" IOBase="0x3f8" IRQ="4" hostMode="Disconnected"/>
<Port slot="1" enabled="false" IOBase="0x2f8" IRQ="3" hostMode="Disconnected"/>
</UART>
<LPT>
<Port slot="0" enabled="false" IOBase="0x378" IRQ="7"/>
<Port slot="1" enabled="false" IOBase="0x378" IRQ="7"/>
</LPT>
<AudioAdapter controller="AC97" driver="DirectSound" enabled="true"/>
<RTC localOrUTC="UTC"/>
<SharedFolders>
<SharedFolder name="Programas" hostPath="C:\Oracle\Programas" writable="true" autoMount="true"/>
</SharedFolders>
<Clipboard mode="Bidirectional"/>
<DragAndDrop mode="Bidirectional"/>
<IO>
<IoCache enabled="true" size="5"/>
<BandwidthGroups/>
</IO>
<HostPci>
<Devices/>
</HostPci>
<EmulatedUSB>
<CardReader enabled="false"/>
</EmulatedUSB>
<Guest memoryBalloonSize="0"/>
<GuestProperties>
<GuestProperty name="/VirtualBox/GuestAdd/HostVerLastChecked" value="4.3.26" timestamp="1435712622146009900" flags=""/>
<GuestProperty name="/VirtualBox/GuestAdd/Revision" value="98988" timestamp="1435712516094043001" flags=""/>
<GuestProperty name="/VirtualBox/GuestAdd/Vbgl/Video/0" value="1920x954x0,0x0,1" timestamp="1435712592180704800" flags=""/>
<GuestProperty name="/VirtualBox/GuestAdd/Vbgl/Video/SavedMode" value="1920x954x0" timestamp="1435712592181204800" flags=""/>
<GuestProperty name="/VirtualBox/GuestAdd/Version" value="4.3.26" timestamp="1435712516093542900" flags=""/>
<GuestProperty name="/VirtualBox/GuestAdd/VersionExt" value="4.3.26" timestamp="1435712516094043000" flags=""/>
<GuestProperty name="/VirtualBox/GuestInfo/OS/Product" value="Linux" timestamp="1435712516092542800" flags=""/>
<GuestProperty name="/VirtualBox/GuestInfo/OS/Release" value="2.6.39-400.17.1.el6uek.x86_64" timestamp="1435712516093042900" flags=""/>
<GuestProperty name="/VirtualBox/GuestInfo/OS/Version" value="#1 SMP Fri Feb 22 18:16:18 PST 2013" timestamp="1435712516093042901" flags=""/>
<GuestProperty name="/VirtualBox/HostInfo/GUI/LanguageID" value="es_ES" timestamp="1435709890894685000" flags=""/>
</GuestProperties>
</Hardware>
<StorageControllers>
<StorageController name="IDE" type="PIIX4" PortCount="2" useHostIOCache="true" Bootable="true">
<AttachedDevice passthrough="false" type="DVD" port="1" device="0">
<HostDrive src="D:"/>
</AttachedDevice>
</StorageController>
<StorageController name="SATA" type="AHCI" PortCount="1" useHostIOCache="false" Bootable="true" IDE0MasterEmulationPort="0" IDE0SlaveEmulationPort="1" IDE1MasterEmulationPort="2" IDE1SlaveEmulationPort="3">
<AttachedDevice type="HardDisk" port="0" device="0">
<Image uuid="{762eadf7-3b7a-4d9b-a08f-6a88e888931b}"/>
</AttachedDevice>
</StorageController>
</StorageControllers>
</Machine>
</VirtualBox>
Now I have my two duplicate VM's! =)