Generally speaking, as far as xapi is concerned, there's no difference between
a VHD backed VDI and any other kind - they all get block attached to dom0 for
any data access. However, IIRC, the HA statefile and the redo log are both
accessed directly - but this would only be enabled if you've got HA turned on.
Other than that, I don't recall that we ever directly touch raw block devices,
though I'll check more thoroughly tomorrow.
Cheers,
Jon
On 21 Jan 2010, at 21:48, Daniel Stodden wrote:
>
> Hi.
>
> When booting PV domains via pygrub, Xapi exclusively accesses the disk
> image through a dom0 plug, right?
>
> This is obviously the case with images backed by VHDs. I guess it's safe
> to assume this is also the case with raw images. But I'm more or less
> guessing.
>
> Does the agent shortcut reads to the bare physical node somewhere?
>
> Asking because of some page cache invalidation issue we apparently
> haven't come across yet.
>
> Daniel
>
>
>
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