On Wed, 2008-07-02 at 12:26 -0400, Bill Nottingham wrote: > Kay Sievers (kay.sievers@xxxxxxxx) said: > > > There doesn't seem to be a good happy medium that allows for degraded assembly > > > when needed, but normal assembly in most cases. One potential way to do this > > > would be to queue events such as these RAID-handling events as 'idle', or > > > 'end of queue', such that they are always run at the end of queue after other > > > events have run. Is that sort of thing possible? > > > > What would be a "queue"? How would you define one? > > The event queue... basically just a push an event to 'last'. > > > Can't you run a "all I need is there" - check with every matching > > device, and make sure, you serialize/lock things properly, and only > > the last device/event would have all needed requirements and trigger > > the action, all earlier would just need to give up. The s390 stuff > > does things like that with the "collect" extra, Ubuntu has a > > "watershed" extra, which may do something like you need. > > watershed just locks to avoid running multiple instances of the same > base command; it doesn't actually solve this. Moreover, just saying > 'only the last device/event' isn't really proper - how do you tell what > is 'last' in the event of a degraded raid array? The same "last" that would say: "The event queue... basically just a push an event to 'last'", I guess :) What would be the "end" of the queue you want to push events to? Kay -- To unsubscribe from this list: send the line "unsubscribe linux-hotplug" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
