On Wed, 2013-09-04 at 21:40 +1000, Alexey Kardashevskiy wrote: > One of the examples (came from Paul) is: > the host runs on POWER8, the guest boots a kernel which is capable of > POWER7 only + POWER7-compat. We do this reboot tweak and boot in > POWER7-compat mode. Then the guest does "yum update" and gets POWER8 > kernel > installed so when it reboots, it will boot in normal POWER8 mode. > Everybody > is happy. > > Having POWER7-compat mode set from the very beginning will break this > behaviour.
But it will allow migrating that partition to a P7 machine. It's important to be able to specify the compat mode for that reason, to create guests that can be migrated to older machines. Cheers, Ben.
