[Bug 1883686] Re: zfs should enable autotrim

[Jean-Baptiste Lallement]

** Tags removed: verification-needed verification-needed-focal
** Tags added: verification-done verification-done-focal

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Title:
  zfs should enable autotrim

Status in ubiquity package in Ubuntu:
  Fix Released
Status in ubiquity source package in Focal:
  Fix Committed

Bug description:
  [Impact]

   * Ubuntu enables automatic TRIM / DISCARD on all filesystems that
  support it, such that on SSD-like storage devices the performance over
  time is improved. ZFS, as setup by ubiquity, did not used to enable
  autotrim option. But it should have it enabled.

  [Test Case]

   1. Complete install using zfs
   2. Reboot and login
   3. Check that the zfs pools have autotrim feature enabled with the following command:
  # zpool get autotrim

  Both pools must have the autotrim property set to 'on'.
  NAME   PROPERTY  VALUE     SOURCE
  bpool  autotrim  on        local
  rpool  autotrim  on        local

  You can also check the status of trimming with:
  # zpool status -t rpool
    pool: rpool
   state: ONLINE
    scan: none requested
  config:

          NAME         STATE     READ WRITE CKSUM
          rpool        ONLINE       0     0     0
            nvme0n1p4  ONLINE       0     0     0  (100% trimmed, completed at mer. 03 juin 2020 07:50:22)

  
  [Regression Potential]

   * When autotrim is in progress, i/o performance may be observed as
  stalling. However, periodic trim outweighs the benefits. Advanced
  operators may choose to disable autotrim, and execute it manually
  during regularly scheduled maintenance windows.

  [Other Info]

   * Shipped in groovy already

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