On Thu, 2007-06-28 at 23:22 +0930, Ian Dall wrote: > I was wanting to try out the "--write-behind" option. I have a raid1 > with bitmaps and write-mostly enabled, which are all the pre-requisites, > I think. > > It would be nice if you could tweak this parameter on a live array, but > failing that, it is hard to see why it couldn't be done at assemble > time. mdadm wont let me though. > > Is this a fundamental limitation? Looking through the mdadm source code it seems like case O(BUILD, WriteBehind): case O(CREATE, WriteBehind): /* write-behind mode */ could be changed to case O(GROW, WriteBehind): case O(BUILD, WriteBehind): case O(CREATE, WriteBehind): /* write-behind mode */ and everything would be OK. I am completely new to this code though, so I am I missing something? If you already had a bitmap you would need to remove it first (--bitmap=none) and then grow it back with writebehind set. Ian -- Ian Dall <ian@xxxxxxxxxxxxxxxxxxxxx> - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
