Has anybody had good luck using FAI where it repartitions on a system that previously contained an lvm setup?
Thomas Neumann (FAI)
blacky+fai at fluffbunny.de
Tue Jul 16 09:50:02 CEST 2013
On Monday 15 July 2013 23:33:55 you wrote:
> Good deal there. Congrats on it... do you actually have any test cases
> with lvm and preserve? If not, what are others doing?
I got some testcases where I was asked not to publish them. One of them may
use lvm+preserve but I don't know from the top of my head.
Can you provide a working example?
Has a couple of preserve tests. You need a '<diskconfig>.preformat' file
which prepares the disk config and a '<diskconfig>' file which does the
actual preserving. I suggest generating a couple of tests from the actual
- on an empty device
- with <diskconfig>.preserve equal to <diskconfig>
- with <diskconfig>.preserve different to <diskconfig> (preserveable)
- with <diskconfig>.preserve different to <diskconfig> (non preserveable)
(move the last one to 91_intentionally_broken/)
Afterwards you need to execute run-tests at least 2 times - the first time
captures the current results as reference, each execution after that
compares the stored result with the current result and notifies you if
something has changed.
[I intentionally didn't include any test results because one can use either
real devices or faked tmpfs-devices. The results would change depending on
what devices are available and their actual capacity.]
> [...] That said, I was a bit surprised to find out that
> even when a partition is preserved, the entire partition table is blown
> away anyway and then rebuilt with the preserved partition using the same
> boundaries. Scarily enough this means if the install crashes at a
> certain point, the preserved partition will effectively have
> disappeared. (Obviously erasing and re-writing the partition table
> requires having all vg's disabled, making my original assertion wrong)
That surprised me too, but since I don't use preserve at all I haven't given
much thought to the implications. Especially what is happening when
preserving LVM devices. (Is it possible to trick setup-storage into
shrinking the underlying PV but 'preserving' a LV? This can lead to very
> Anyway, I'd be glad to hear if I'm wrong/out of line, with these
I'd like to see an improvement on that front. I assume Thomas L. isn't happy
about the current regression either.
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