So. I'm working on the new server installer for s390x, and it already
works quite good on qemu/kvm.

(whilst most of the UX improvements are not visible in the daily images,
it does boot and completes the install in qemu/kvm. We have colors
support, and partitioning changes/improvements staged in git master.)

http://cdimage.ubuntu.com/ubuntu-server/daily-live/current/disco-live-
server-s390x.iso

Performing ISO/USB load, and giving access to the LPAR (it needs it),
also results in the ability to boot the new installer. But it is
painfully slow, and often hits OOM.

I was hoping that hmcdrvfs is performant enough for read-only access as
the underlay of the overlayfs, for live ubuntu server experience, and
the source of installation. At the moment, it is painfully slow. And I'm
not sure if we can tune vfs or hmcdrv to make this installation type
viable.

I almost feel like starting to make boot-in-place images, and requesting
HMC to have ability to accept an upload of a qcow2 image, blast it onto
a zfcp LUN disk, and IPL that as a read-only disk, for extremely fast
booting of the new installer, with extremely fast install speeds.

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https://bugs.launchpad.net/bugs/1806115

Title:
  cannot set hmcdrv cachesize to 1GB

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