Re: Xen and LVM backed domu's

["Sam Fourman Jr." <sfourman%gmail.com@localhost>]

On Thu, Feb 25, 2010 at 8:03 AM, Christoph Egger 
<Christoph_Egger%gmx.de@localhost> wrote:
> On Thursday 25 February 2010 14:17:46 haad wrote:
>> > I recently found out that HVM domUs running with lvm-backed storage
>> > detect a 0MB hard disk - this is not a domU-OS specific problem, as qemu
>> > itself reports 0MB
>> > in the "bios" - thus making them unusable.
>> >
>> > Not sure where the problem might be here, but I suspect qemu. Xen, as I
>> > recall, (I don't have my NetBSD/Xen box nearby) correctly detects the
>> > size of the logical volume.
>>
>> Hmm yes that can be easily problem if Xen qemu uses some different
>> disk ioctls which are not supported by dm driver.
>>
>> I think that ideal would be change disk_ioctl[1] routine to work with
>> more that one IOCTL and listen for all other different disk size
>> ioctls calls. disk_ioctl can use dictionary to create every possible
>> structure for caller.
>
> This problem is not specific to LVM. You can reproduce this when you tell Xen
> to use a physical disk in general for the domU.
>

is this a NetBSD specific problem? are there any proposed workarounds?

Sam Fourman Jr.
Fourman Networks