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 > > > > _______________________________________________ > xen-api mailing list > [email protected] > http://lists.xensource.com/mailman/listinfo/xen-api _______________________________________________ xen-api mailing list [email protected] http://lists.xensource.com/mailman/listinfo/xen-api
