Some data: http://paste.ubuntu.com/12887493/ (same data is below, but
for formatting the paste is nicer).
The problem stated (and generally known) is that hwe-t kernels do not
reliably boot on power8 in powernv ("bare metal" mode).
There are at least 2 possible solutions to this problem:
a.) fix maas to be able to set a subarch ('hwe-u') for enlistment and
commissioning.
b.) remove the 'hwe-t' stream data from existance and hope that maas then uses
the 'hwe-u' product in its place.
'a' has been reported as to be fixed in 1.9, and thats great, but that
does not help users for the short term.
For 'b', this is still less than ideal for several reasons:
1.) hwe-t (3.13) kernels work fine on ppc64 kvm VMs
If i were a user of maas driving ppc64 kvm VMS (PowerKVM or Ubuntu), then
I'd be quite happy with 3.13/hwe-t which has support until 2019.04 . I'd much
prefer staying on that supported kernel to the "interim kernel upgrade path"
[1]. Ie, If I installed a hwe-u kernel that kernel is only supported for 10
more months (2016.08). If we remove that product, we'll no longer have a way
of installing 14.04+hwe-t.
2.) If we remove the 'hwe-t' stream, we're essentially deleting a product on
the server side and hoping that maas systems will follow that deletion. I'd
hope that maas doesn't do that, as it would mean a error on the server side
could completely wipe out installable systems on the target. The code i've
written for mirroring streams does not delete products locally unless
specifically told to. So, likely an existing user *still* has to do something
manually to fix this problem.
3.) its not clear if this would work or not. Small amount of testing would
get us an answer, but not clear yet, and I personally didn't understand how it
happens in code.
[1]
https://wiki.ubuntu.com/Kernel/LTSEnablementStack#Kernel.2BAC8-Support.A14.04.x_Ubuntu_Kernel_Support
-- data in line --
$ fmt="%(product_name)s %(kflavor)s %(kpackage)s %(subarch)s %(subarches)s"
$
daily=http://maas.ubuntu.com/images/ephemeral-v2/daily/streams/v1/com.ubuntu.maas:daily:v2:download.json
$
releases=http://maas.ubuntu.com/images/ephemeral-v2/releases/streams/v1/com.ubuntu.maas:v2:download.json
##
## From daily, we have trusty builds for only hwe-t, hwe-u
##
$ sstream-query --max=1 --output-format="$fmt" $releases ftype=boot-kernel
release=trusty arch=ppc64el | column -t
com.ubuntu.maas:v2:boot:14.04:ppc64el:hwe-t generic linux-generic
hwe-t generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t
com.ubuntu.maas:v2:boot:14.04:ppc64el:hwe-u generic
linux-generic-lts-utopic hwe-u generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u
##
## From daily, we have trusty builds for each hwe-t, hwe-u, hwe-v
##
$ sstream-query --max=1 --output-format="$fmt" $daily ftype=boot-kernel
release=trusty arch=ppc64el | column -t
com.ubuntu.maas.daily:v2:boot:14.04:ppc64el:hwe-t generic linux-generic
hwe-t generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t
com.ubuntu.maas.daily:v2:boot:14.04:ppc64el:hwe-u generic
linux-generic-lts-utopic hwe-u generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u
com.ubuntu.maas.daily:v2:boot:14.04:ppc64el:hwe-v generic
linux-generic-lts-vivid hwe-v
generic,hwe-p,hwe-q,hwe-r,hwe-s,hwe-t,hwe-u,hwe-v
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https://bugs.launchpad.net/bugs/1508565
Title:
maas uses 3.13 (hwe-t) kernel which does not work on IBM power
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