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