On Mon, Apr 20, 2009 at 04:08:00PM +1000, Neil Brown wrote:
On Saturday April 18, dledford@xxxxxxxxxx wrote:
I've been thinking about this, and this is the method I would suggest.
Add two new keywords to the mdadm.conf file:
ASSEMBLE
INCREMENTAL
Allow each of those keywords to have one of three set values:
None - Don't attempt to assemble any arrays regardless of whether or
not they are in the mdadm.conf file or not
Known - Only assemble arrays with a matching array line
All - Attempt to assemble any array found
The combination of the two options and the three settings would allow
you to control mdadm behavior for both array assembly modes
independently. That, combined with my previous patch, should allow
arrays to assemble well, with known names, allow you to control auto
assembly by udev, and in the event that your machine just exports
volumes to other machines for their use, stop assembly entirely.
Why "None"?? Why would you use "None" rather than "Known" with an
empty list of arrays?
i believe ASSEMBLE is intended as AUTO ASSEMBLE
so we would have the description for the arry and be able to assemble it
manually using: mdadm -A /dev/md/foo
i would like to be able to define this per array tough
Why have two options: ASSEMBLE and INCREMENTAL ??
If what circumstance would you use different settings for these two
options.
maybe i want to avoid incremental assemble of a big array, which would
result in undesired rebuilds.
I current have two patches sitting in my scratch queue. I am by no
means committed to them.
One allows you to have e.g.
ARRAY ignore UUID=foo:bar:dead:beef
with the meaning that auto-assembly will ignore that array. If you
run
mdadm --assemble /dev/md/thing --uuid foo:bar:dead:beef
it will still assemble the array, but any auto-assembly will ignore
it.
it is not clear to me what the difference is from having no line at all
The other allows you to say:
AUTO -ddf -0.90 +all
which means don't auto-assemble any 'ddf' or '0.90' array, but do
auto-assemble anything else that is recognised.
You might want to use dmraid for ddf??
If you just have
AUTO -all
one syntax or the other is ok for me, provided the ability to control
what mdadm is doing.
L.
--
Luca Berra -- bluca@xxxxxxxxxx
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