[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Handling iSCSI block devices (Was: Driver domains and device handling)
Roger Pau Monne writes ("Re: Handling iSCSI block devices (Was: Driver domains and device handling)"): > On 14/12/12 19:26, Ian Jackson wrote: > > Roger Pau Monne writes ("Re: Handling iSCSI block devices (Was: Driver > > domains and device handling)"): > >> * remove: called to disconnect the device. Xenstore backend entries > >> exists, and backend state is 6 (XenbusStateClosed). > > > > I assume we need an unprepare here too. > > I've also thought that, but the reason for prepare to exist is to reduce > the time that the "add" operation takes, thus reducing the blackout > phase during migration. The unprepare operation might also be slow. (Of course we believe in crash-only software but the storage provider might not...) > There's no such problem in the remove phase, but I guess we need an > unprepare in case there's a failure between the prepare and add > operations, and we wish to give the hotplug script an opportunity to > unwind whatever the prepare operation has done. > Yes. Ian. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
|
Lists.xenproject.org is hosted with RackSpace, monitoring our |