Belkin XM Commander Manual do Utilizador descarregar pdf (Página 62)

5.15 File-Backed Virtual Disks and

Loopback Devices

When a virtual machine is running, each of its le-backed virtual disks consumes a

loopback device on the host. By default, the host allows up to eight loopback devices

to be consumed.

To simultaneously run more le-backed virtual disks on a host, you can increase the

number of available loopback devices by adding the following option to the host’s

/etc/modprobe.conf.local le.

options loop max_loop=x

where x is the maximum number of loopback devices to create.

Changes take effect after the module is reloaded.

TIP

Enter rmmod loop and modprobe loop to unload and reload the module.

In case rmmod does not work, unmount all existing loop devices or reboot the

computer.

5.16 Saving Virtual Machines

The save operation preserves the exact state of the virtual machine’s memory. The op-

eration is slightly similar to hibernating a computer. The virtual machine is off, but it

can be quickly restored to its previously-saved running condition. The operation does

not make a copy of any portion of the virtual machine’s virtual disk.

When saved, the virtual machine is paused, its current memory state saved to a location

you specify, and then the virtual machine is stopped. The amount of time to save the

virtual machine depends on the amount of memory allocated. When saved, a virtual

machine’s memory is returned to the pool of memory available on the host.

The restore operation is used to return a saved virtual machine to its original running

state.

56 Virtualization with Xen

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Belkin XM Commander Manual do Utilizador Página 62