[Bug 1550301] Re: ZFS: Set elevator=noop on disks in the root pool

[Richard Laager]

ZoL 0.6.5.6 has landed, so this should be good to go. Note that it only
affects zfs-initramfs. It doesn't affect any other use of ZFS.

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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:
  New

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. Therefore, I think we want to set the
  "noop" scheduler for disks in the root pool.

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