On 02/18/2014 05:20 AM, Michael Still wrote: > On Tue, Feb 18, 2014 at 3:14 AM, Daniel P. Berrange <berra...@redhat.com> > wrote: >> On Tue, Feb 18, 2014 at 03:08:59AM -0700, Michael Still wrote: >>> On Tue, Feb 18, 2014 at 2:43 AM, Daniel P. Berrange <berra...@redhat.com> >>> wrote: >>> >>>> So I'd saying changing it to 'disk' is out of the question unless >>>> we unconditionally use vfat as the filesystem instead of iso9660. >>> >>> So, at the moment we conflate a flag about format (iso9660 or vfat) >>> with a flag about device type. We could have both as separate flags >>> with reasonable defaults. However, at the moment we're pretty much >>> presented with a choice of either having a working Windows instance, >>> or working block migration. I suspect that's a trade off we don't want >>> to have to make. >> >> Why do we need to support both iso9660 and vfat ? If we only cared >> to support vfat, then we could have working Windows and working block >> migration. > > iso9660 was made the default at the request of the cloud-init author. > IIRC the decision was based on it being a "cleaner" interface than > vfat (read only, etc). I certainly think we could make vfat the > default, and put a big ugly warning about iso9660 in the flag which > lets operators select which to use. > >> Incidentally since you say other virt drivers don't use cdrom, does >> this mean they only use vfat, or are they using iso9660 + disk and >> thus broken for windows too ? > > I'm specifically thinking of hyper-v here, and I am sure they tested > with Windows. To be honest I don't remember all the details, I just > recall that at least one hypervisor had issues with attaching a second > cdrom (we support boot from cdrom).
I think that's a xen limitation. I vaguely remember John Garbutt
bringing that up at a previous summit.
-Sean
--
Sean Dague
http://dague.net
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