Re: Change Chunk Size on Array?

[Goswin von Brederlow <goswin-v-b@web.de>]

Neil Brown <neilb@suse.de> writes:

> Online changing of chunk size for raid5 is very close to being
> implemented.
> All the kernel side support will be in 2.6.30.
> I just need to spend some time getting mdadm to make it work.
> Because data is being rearranged in-place, and because you don't want
> to lose everything if your systems crashes, mdadm will have to work in
> tandem with the kernel making a backup copy of a section of the array,
> allowing the kernel to reshape that section, and then moving on to the
> next section.  It will be slow, but it will be reliable.
>
> NeilBrown

Shouldn't mdadm create a file and pass the FD to the kernel or a
loopback device and pass the major/minor and the kernel then moves
data there itself? Seems like a bad idea to pass all the data of the
raid to userspace just so it can be passed back to the kernel again.

MfG
        Goswin