On Sun, Feb 14, 2010 at 02:51:59AM +0100, Volker Armin Hemmann wrote:
0.90 has a very bad problem, which is that it is hard to distinguish
between a RAID partition at the end of volume and a full RAID device.
This is because 0.90 doesn't actually tell you the start of the device.
Then, of course, there are a lot of limitations on size, number of
devices, and so on in 0.90.
but it is the only format supporting autodetection.
So - when will autodetection be introduced with 1.X? And if not, why not?
All I found was 'autodetection might be troublesome' and nothing else.
Well the discussions that lead to deprecation of in-kernel autodetection
date back to 2005 or earlier, so it's not easy to find.
iirc the main problem was that autodetection used the super minor to
name the device and it got very confused if you moved a drive from a
system to another.
mdadm based autodetection is reliable since you can associate uuid with
device name in mdadm.conf
But dealing with initrds is troublesome too. Pure evil even.
not really much more complex than getting kernel to do the right thing.
and it is orders of magnitude easier to debug than kernel code.
L.
--
Luca Berra -- bluca@xxxxxxxxxx
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