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[Eric Desrochers <eric.desrochers@xxxxxxxxxxxxx>]

** Also affects: zfs-linux (Ubuntu Zesty)
   Importance: Undecided
       Status: New

** Also affects: zfs-linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: zfs-linux (Ubuntu Xenial)
       Status: New => Fix Released

** Changed in: zfs-linux (Ubuntu Xenial)
   Importance: Undecided => Medium

** Changed in: zfs-linux (Ubuntu Xenial)
     Assignee: (unassigned) => Colin Ian King (colin-king)

** Changed in: zfs-linux (Ubuntu Zesty)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1550301

Title:
  ZFS: Set elevator=noop on disks in the root pool

Status in zfs-linux package in Ubuntu:
  In Progress
Status in zfs-linux source package in Xenial:
  Fix Released
Status in zfs-linux source package in Zesty:
  Confirmed

Bug description:
  ZFS-on-Linux has its own I/O scheduler, so it sets the "noop" elevator
  on whole disks used in a pool.
  https://github.com/zfsonlinux/zfs/issues/90

  It does not set the scheduler for a disk if a partition is used in a
  pool out of respect for the possibility that there are non-ZFS
  partitions on the same disk.
  https://github.com/zfsonlinux/zfs/issues/152

  For regular pools, the recommendation is to use whole disks. For a
  root pools, it's just the opposite. The typical case is that
  partitions are used. And, for root pools, it is unlikely that the same
  disks have non-ZFS filesystems.

  The debdiff in comment #5 applies cleanly to the latest package and
  functions correctly. This is an important change for root-on-ZFS
  users. It has no effect on non-root-on-ZFS installs, because the code
  is only in the zfs-initramfs package.

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