Hi Brent,
> can you run qemu from the command line on a bare metal system? If so,
I thought my May 20 procedure was pretty simple.
Oh yes you can run it from cli on bare metal - and your procedure was
indeed simple and very useful. I was not trying to challenge any of that
- sorry if that was misleading.
Trying again :-): Qemu is like a swiss army knife, doing plenty of things and
learning new twists every now and then. The command line can do all of it and
due to that it might be that you find plenty of howtos (or just people trying
options) that - to stay in the swiss army knife metaphor - still use the blade
to cut down a tree. It does work, but in the meantime a saw was added which is
much better for the task. That is what here virtio is to ide/sata.
It is in no way "invalidating" that there seems to be an issue with what
ide/sata announces and how it then works - but it lowers the severity of this
case a lot.
> I haven't tried all of your combinations ...
Thanks for trying the most important ones - that was enough IMHO.
I think with the info so far, by now we might have to split this
discussion into two - almost separate - cases:
a) what/why is going on with discard on ide/sata attachments, confirmed
but prio rather low (as outlined above)
b) Why are the unused non-zero blocks on a extended cloud-image used as
root grow
We might later need to split out an extra bug for (b), but for now I've added a
bug task here (they might know more, maybe have already seen or discussed it
before)
I think by now for (b) we confirmed:
1. A new fs on those disks has no lost blocks
2. The cloudimage extended has a few lost blocks (12KB - neglegible)
3. The cloudimage extended and used as root grows more lost blocks (seems like
5 MB above)
I could try explain the few lost ones in #2 by padding when creating the image.
But why are they increasing more when used as root device - that I can't
explain yet.
@CPC team - do you happen to know more about this already?
** Also affects: cloud-images
Importance: Undecided
Status: New
** Changed in: qemu (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1974100
Title:
qemu ide/sata disks do not work well with discard/trim
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