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 <[EMAIL PROTECTED]>
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