RE: [Xen-users] XCP importing dd img to vdi

[Dave Scott <Dave.Scott@xxxxxxxxxxxxx>]

Hi,

> Hi all, i have read XCP docs but have no fully imagination of how is
> storage layer works, it is possible to do
> "dd if=/path/to/phis of=/path/to/saved.img" on working Server and do
> reverse "dd if=/path/to/saved.img of=/pash/to/some.vdi" ?
> 
> if not have some any other ways to do that?

The storage layer sits behind an interface which supports operations like 
vdi_create, vdi_destory, vdi_snapshot, vdi_clone. Multiple implementations of 
this interface exist which represent VDIs as .vhd files on NFS servers; 
.vhd-format data on LVs on shared LVM VGs; and LUNs on iSCSI/FC targets. You 
can add a new plugin module if you have storage in a particular format.

Are you trying to backup and restore a VM? If so, you could consider:
* creating a VM snapshot (xe vm-snapshot); then
* either:
** revert the VM to the snapshot (xe snapshot-revert)
* or:
** create a VM template from the snapshot (xe snapshot-create-template); export 
the template (xe template-export); import it on a different resource pool (xe 
vm-import)

If you really want to 'dd' a disk then the safest way is to block-attach it to 
dom0 first. Have a look in the script /opt/xensource/debug/with-vdi.

Currently the storage interface doesn't export a 'sparseness map' of the 
underlying disk. In future we're hoping to figure out a good way to make this 
information available.

Cheers,
Dave

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