[Bug 1891214] Re: targetcli/LIO needs tcm_vhost and xen-scsiback feature enabled OR option disabled

Rafael David Tinoco 1891214 at bugs.launchpad.net
Tue Sep 8 12:42:09 UTC 2020


Okay, since TCM_VHOST is experimental in kernel, as we are in feature
freeze for Groovy, I'm going to cap the missing features from targetcli
so end user does not experience failures from the UI. This bug can serve
as a future guidance in enabling those options (specially TCM_VHOST).

** Changed in: qemu (Ubuntu)
    Milestone: ubuntu-20.10-beta => None

** Changed in: python-rtslib-fb (Ubuntu)
    Milestone: ubuntu-20.10-beta => None

** Changed in: linux (Ubuntu)
    Milestone: ubuntu-20.10-beta => None

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https://bugs.launchpad.net/bugs/1891214

Title:
  targetcli/LIO needs tcm_vhost and xen-scsiback feature enabled OR
  option disabled

Status in linux package in Ubuntu:
  Confirmed
Status in python-rtslib-fb package in Ubuntu:
  Confirmed
Status in qemu package in Ubuntu:
  Incomplete

Bug description:
  targetcli-fb was recently included in MAIN and rely on some features
  that aren't available currently in Ubuntu:

  ## TCM VHOST

  /vhost> create
  b'modprobe: FATAL: Module tcm_vhost not found in directory /lib/modules/...

  not enabled in Ubuntu kernels.

  QEMU virtio-scsi feature:

  https://wiki.qemu.org/Features/VirtioSCSI/TCM_Overview

  KERNEL option to be enabled:

  https://cateee.net/lkddb/web-lkddb/TCM_VHOST.html

  KERNEL TCM documentation:

  https://www.kernel.org/doc/html/latest/target/tcmu-design.html

  LIO (LinuxIO) VHOST feature explained:

  http://linux-iscsi.org/wiki/VHost

  ## XEN PVSCSI

  Same happens for XEN:

  https://wiki.xenproject.org/wiki/Paravirtualized_SCSI

  PS: this would I would go for a targetcli fabric module disablement
  instead of enabling the feature.

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