Re: [Xen-API] pygrub-related question

[Jonathan Ludlam <Jonathan.Ludlam@xxxxxxxxxxxxx>]

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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