RE: [Xen-API] How Pygrub work on VHD

[Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>]

> Now I know how pygrub works,
> before run pygrub, VM system disk is plugged into dom0 as /dev/xvd*
> pygrub grab kernel&initrd from it
> then this disk is unplugged from dom0.
> 
> A curious question,
> When I run HVM VM, VM system disk is still plugged into dom0
> temporarily, I don't think it is necessary. because it is VM bootloader
> to load kernel&initrd in HVM. Maybe I'm missing something here.

The qemu disk emulation accesses the disks via /dev/xvd* until the PV drivers 
start up in-guest. 
 
> at last, I'd like to get confirmation from you guys, that dd vhd file to
> lvm volume(with same virtual disk size) works,  though it works in my
> experiment:-)

It'll work, though it would obviously be better if you create optimized VHD 
files. Padding the bitmaps to 4KB is probably the most important optimization. 
You can use vhd-util to create VHDs.

Ian 




_______________________________________________
xen-api mailing list
xen-api@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/mailman/listinfo/xen-api