Hello Kiri, Am Montag 31 Oktober 2011 15:15:12 schrieb Jiri Denemark: > Is there any way you can pass the exact order to Xen? Not that I know of. This is one of the corner cases, which is only relevant if you have a Xen-PV domain AND are using PyGrub as the boot-loader. For HV the flag is unused and for direct kernel boot you don't need it either. Only for PV+bootloader needs Xend a way to find the disk containing the kernel. In xen-4.1/tools/python/xen/xend/XendDomainInfo.py:3234 _configureBootloader() build a list of all vbds marked bootable and passes only the first one to Pygrub. Technically you mark multiple disks as bootable, but the flag is only set in xen-4.1/tools/python/xen/xend/XendConfig.py:1498 device_add(), which does this exactly once for the first disk added. > Multiple devices with > bootIndex are allowed (the indexes are unique of course) to specify booting > preference and by setting (bootable 1) anytime bootIndex != 0 makes all > such devices bootable in unspecified order. Same with Xen — I thinks: If you mark multiple disks as bootable, the first disk gets used — whichever that is. > If only one bootable device is > supported by Xen, you should probably emit (bootable 1) only for bootIndex > = 1 and maybe even forbid more than one device with bootIndex. This makes perfect sense for libvirt → xen, since we want determinictic behaviour. But if multiple disk are marked bootable, converting xen → libvirtd either has to pick one disk and report just that disk as bootable; or reports all disks marked as bootable. Either way, round-trip is broken. I wish XenLight would be useable. > You also need to add 'deviceboot' feature to guest capabilities XML so that > apps know they can use <boot order='n'/> when creating this kind of guests. Will have a look. Sincerely Philipp -- Philipp Hahn Open Source Software Engineer hahn univention de Univention GmbH Linux for Your Business fon: +49 421 22 232- 0 Mary-Somerville-Str.1 D-28359 Bremen fax: +49 421 22 232-99 http://www.univention.de/
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